The document provides an overview of a forensic laboratory, including its various departments and the analytical techniques used. It discusses the biology/DNA lab which examines blood, fluids, and tissues and performs DNA sequencing. The chemistry lab tests for drugs, poisons, and chemicals using techniques like GC/MS and HPLC. Other labs discussed include trace evidence, firearms, photography, and materials analysis. The document outlines the instruments used such as FTIR, GC/MS, LC/MS, microscopes, and describes some common analytical methods in forensic science.
Derived from GK word daktylose-finger ,graphein- to write
Method of identification based on unique epidermal ridge pattern on the tips of fingers.
Syn-Fingerprinting, Dermatoglyphics, Galton system of identification
Viscera is an important evidence in forensic toxicology to find out the poison used to kill a person. But how to preserve this viscera?
Read in this ppt!
Derived from GK word daktylose-finger ,graphein- to write
Method of identification based on unique epidermal ridge pattern on the tips of fingers.
Syn-Fingerprinting, Dermatoglyphics, Galton system of identification
Viscera is an important evidence in forensic toxicology to find out the poison used to kill a person. But how to preserve this viscera?
Read in this ppt!
Forensic science utilizes scientific principles to support or negate theories surrounding physical evidence found at a crime scene. As such, forensic scientists analyze evidence gathered or received from crime scenes and present their findings based the results of their analyses.
A forensic science job description may appear distinctly different depending on the area of forensic science being practiced. This is because forensic science is a rather broad field and thus encompasses a number of specialties, all of which are rooted in the natural sciences.
Thanatology
Types of transplants
Cause, Mechanism of Death
Manner of death
Anoxia
Signs of Death
Immediate Changes (Somatic Death)
Early Changes (Molecular Death)
Algor Mortis ......
Reference
Sample collection and preservation of biological samplesNeha Agarwal
A preliminary survey should be carried out to evaluate potential evidence. In particular, the
recognition of evidence plays a critical role in solving or prosecuting crimes. The priority of the
potential evidence at crime scenes should be assessed based on each item’s relevance to the solution
of the case. Higher priority should be assigned to evidence with probative value to the case.
For example, the evidence related to a corpus delicti is considered to be of the highest priority.
Corpus delicti is a Latin term meaning “body of crime.” In Western law, it primarily refers to the
principle that in order for an individual to be convicted, it is necessary to prove the occurrence of the crime. In a forensic investigation, it also refers to the physical evidence proving that a crime was committed
Forensic science utilizes scientific principles to support or negate theories surrounding physical evidence found at a crime scene. As such, forensic scientists analyze evidence gathered or received from crime scenes and present their findings based the results of their analyses.
A forensic science job description may appear distinctly different depending on the area of forensic science being practiced. This is because forensic science is a rather broad field and thus encompasses a number of specialties, all of which are rooted in the natural sciences.
Thanatology
Types of transplants
Cause, Mechanism of Death
Manner of death
Anoxia
Signs of Death
Immediate Changes (Somatic Death)
Early Changes (Molecular Death)
Algor Mortis ......
Reference
Sample collection and preservation of biological samplesNeha Agarwal
A preliminary survey should be carried out to evaluate potential evidence. In particular, the
recognition of evidence plays a critical role in solving or prosecuting crimes. The priority of the
potential evidence at crime scenes should be assessed based on each item’s relevance to the solution
of the case. Higher priority should be assigned to evidence with probative value to the case.
For example, the evidence related to a corpus delicti is considered to be of the highest priority.
Corpus delicti is a Latin term meaning “body of crime.” In Western law, it primarily refers to the
principle that in order for an individual to be convicted, it is necessary to prove the occurrence of the crime. In a forensic investigation, it also refers to the physical evidence proving that a crime was committed
DEFINATION
Any material can develop significance in crime scene is physical evidence
Locard’s Exchange Principle
Locard’s Principle
Types of Evidence
Trace Evidence
Trace Evidence
Trace Evidence can be Fragile and Easily Lost
Transfer Evidence
Indented or Impression Evidence
Department in Pakistan
Faizana Naeem 13004065107
Mohammad Awais 13004065105
Mashal Khalid 13004065093
AbdulRehman Asghar 13004065074
Univerisety of management and technology Lhr.
Introduction
Crime is world phenomena and with course of time it is going to be a complicated one.
All over the world especially in technically developed countries, criminologists, detectives are adopting new methods to beat the crime through latest criminal investigation techniques.
But in the country like Pakistan the sources of criminal investigation are mostly the same as were in the past.
History
forensic” comes from the Latin word “forensis” meaning the “forum”
Centuries back the forensic science has been derived by solving mysterious cases.
It has many definitions but it has a blind definition that the application of scientific methodology to solve legal problems, in other words it bring many fields of science
NFSA
NFSA is the latest and well equipped lab in the history of Pakistan to facility criminal justice system
It intend to provide quality and standard forensic services under one roof
Keeping in view the importance of forensic sciences in criminal investigation and criminal justice, Punjab Government established the forensic Laboratory in Lahore which meets the international standards.
The actual cost of the project RS.2448.469 million.
In Sindh criminal investigation department came in to being as a small branch.
The laboratory will work under the forensic science agency within the framework of the Punjab Forensic Science Agency Act.2007
Sub-Departments
Crime Scene Investigation
Computer Forensic Department
Forensic Pathology
Questioned Documents Department
DNA & Serology Department
Audio Visual Analysis Department
Forensic Toxicology Department
Trace Evidence Department
Firearms & Tool Marks Department
Crime Scene Investigation
“The collection of information and evidence for
identifying, apprehending, and convicting suspected
offenders ”
maintain the integrity of the evidence.
The first police officer to arrive at a crime scene must take certain steps to preserve the evidence. Only after this duty is performed, analysis of the scene may begin.
The steps include: ·
Personal safety
Organization of thoughts.
Evaluate the severity of the situation.
Identify all involved and uninvolved individuals in the area
Be aware of weapons and hazards.
Be aware of potential evidence
Don’t touch anything unless necessary.
Investigation Facilities in Pakistan
National Forensic Science Agency, Islamabad
Forensic Science Laboratory, Islamabad
Forensic Science Laboratory, Lahore
Chief Chemical Examiner, (Punjab), Lahore
Chemical Examiner, Multan
Chemical Examiner, Rawalpindi
Forensic Science Laboratory, Karachi
DNA and Serology
Biological evidence, which contains DNA, can connect an offender
Laboratory Glassware Manufacturer and suppliersAticoExport3
These are just some examples of modern science labs that laboratory glassware suppliers and laboratory glassware manufacturers serve. Whatever your lab's research goal or scope, it cannot function seamlessly without the vast range of excellent-quality equipment and glassware.
يقوم كلا منا بالإستعداد وتجهيز و تسخير كل ما يملك لخوض إمتحانات حياته الهامة
قد سخّر الله كل ما قد نحتاجه لتجاوز إمتحان الحياة الدنيا و العبور به إلى الجنة
دعنا نراجع هذا معا
It is a multi-element analysis technique where The ICP source converts the atoms of the elements in the sample to ions. These ions are then separated and detected by the mass spectrometer
Direct Mercury Analyzer for analysis of liquid, solid and gaseous samples
DMA which uses the principle of thermal decomposition, amalgamation and atomic absorption.
The DMA-80 can analyze solid, liquid and gas matrices with equal precision.
All mercury is released from the sample through thermal decomposition.
This eliminates the need for any sample preparation.
The TQA software offers a complete selection of qualitative and quantitative analytical techniques for FTIR.
It contains all of the algorithms that are typically used for calculating component concentrations and classifying spectra based on a set of standards
The analyst is required to analyze a number of QC samples throughout the run where there are decisions to be made based on a window of acceptance for each QC sample analyzed.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
2. 2
ForensicLaboratory
To everyone who has helped us with support,
new books, hard/soft ware And over the internet
Special thanks for Thermo
http://www.thermofisher.com
5. 5
ForensicLaboratory
• The word forensic comes from the
Latin adjective forensis, meaning "of or
before the forum." In Roman times, a
criminal charge meant presenting the
case before a group of public
individuals in the forum.
• The term "forensic" is effectively a
synonym for "legal" or "related to
courts".
7. 7
ForensicLaboratory
Other classification, The laboratory is
divided into many areas of investigation:
• Fingerprint lab.
• Trace evidence lab.
• Serology / DNA labs.
• Materials lab.
• Firearms lab.
• Photography lab.
• Chemistry lab.
• Others labs
8.
9. 9
ForensicLaboratory
The items to be tested for fingerprints,
• A newspaper,
• A glass bottle,
• A floppy disk, and
• A glossy magazine.
10. 10
ForensicLaboratory
• Skin is generally divided in to two layers.
• These are the inner layer (dermis) and the
outer layer (epidermis).
• The outer layer is divided into five
stratified sub-layers, which are listed from
bottom to top as,
• Basal generating layer
• Spinous layer
• Granular layer
• Transitional hyaline layer
• Horny cornified layer.
12. 12
ForensicLaboratory
• A dedicated workstation for the
recording and enhancement of latent
fingerprints
• An optical projector for the visual
comparison of record and recovered
fingerprints
Some technique’s
13. 13
ForensicLaboratory
In most labs, a unit commonly known as a 'trace evidence
unit' forms an area where scientists look for clues in
evidence such as:
• Hair,
• Fabric,
• Dust,
• Fiber and
• Skeletal remains.
• Refer to the “Every Criminal Leaves A Trace”.
14. 14
ForensicLaboratory
• Recovering, comparing and identifying non-biological trace
evidence
• Paint,
• Potential fire accelerants,
• Glass, fibers and textiles,
• Plastics, building products,
• Safe insulation and commercial products;
• Conducting physical matching of the seized materials;
• Providing scientific and technical support to other forensic
disciplines; and hosting and supporting the Paint Data Query
(PDQ) database.
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ForensicLaboratory
Forensic serologists:
scientists who examine physical evidence with the intent of
finding, identifying and individualizing stains of biological
origin.
The serology unit specializes in the
identification and analysis of:-
• Bloodstains,
• Bodily fluids,
• DNA sequencing.
The most common of the DNA tests, the polymers chain
reaction( PCR), is now able to be performed in small
laboratories,
17. 17
ForensicLaboratory
Bloodstain analysis traditionally follows the
following steps:
• Is the stain blood?
• Is the stain animal or human blood?
• If human blood, what type?
• Can the sex, age, and race of the
source of blood be determined?
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ForensicLaboratory
• Tiny particles of blood will cling to most
surfaces for years
• Hidden blood spatter patterns can help
investigators locate the point of attack and
even what sort of weapon was used (a bullet
makes blood splatter very differently than a
knife does).
• Luminal may also reveal faint bloody shoe
prints, which gives investigators valuable
information about the assailant and what he or
she did after the attack
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ForensicLaboratory
• Forensic DNA analysis deals with the identification of
the source of a body fluid through DNA testing two
samples are taken, one from the suspect and one from
the scene of the crime.
• The samples can be skin tissue, hair, blood, semen or
vaginal fluid, and really anything else with cells in it (the
two samples don’t even have to be the same material
because all cells of the same organism have identical
DNA).
• Then, the DNA of both samples is extracted, studied, and
compared. If the DNA matches, then the suspect was at
the scene of the crime.
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ForensicLaboratory
• Identify potential suspects whose DNA may match evidence left at crime
scenes.
• Exonerate persons wrongly accused of crimes.
• Identify crime and catastrophe victims.
• Establish paternity and other family relationships.
• Identify endangered and protected species as an aid to wildlife officials
(could be used for prosecuting poachers).
• Detect bacteria and other organisms that may pollute air, water, soil, and
food.
• Match organ donors with recipients in transplant programs.
• Determine pedigree for seed or livestock breeds.
• Authenticate consumables such as caviar and wine.
21. 21
ForensicLaboratory
Material units are used to identify and analyze :-
• Metals,
• Paints,
• Ceramics,
• Soil,
• Wood.
In an attempt to trace a crime back to a possible suspect. The
biology unit is in charge of analyzing all biological evidence
such a seeds and plants.
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ForensicLaboratory
• Firearms units test weapons to see
which weapon made the mark on an
object or wounded or killed a person.
• To be able to carry out these tests,
firearms specialists study the used
bullet cartridges and use shooting baths
to fire weapons, identify the bullet
marks and establish the firing distance.
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ForensicLaboratory
Firearms can be test-fired to obtain known specimens
for comparison with evidence ammunition components,
such as:-
• Bullets,
• Cartridge cases,
• Shot Pellets, Buckshot, or Slugs,
• Wadding,
• Unfired Cartridges or Shot shells,
• Gun Parts,
• and shot shell casings.
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ForensicLaboratory
• Photography plays a vital role in the
forensic laboratory, as photography is
used to document crime scene
evidence.
• Processing resources and dark room
services allow specialists in the area of
photography to analyze photographs
and bring the evidence to light.
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ForensicLaboratory
• Physical dimensions can be derived from images
through the use of geometric formulas or on-site
comparison.
• For on-site comparisons, examiners enter the
scene and place a height chart at the location
of the subject(s) or object(s) of interest.
• Examples of Photogrammetry include
determining the height of a bank robbery
subject(s) and the length of the weapon
(s) used by the subject(s) depicted in
surveillance images.
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ForensicLaboratory
• Large labs also have arson and
explosives experts as well as specialists
in software, computer data, files,
documents, audios and video
recordings.
• The units available in different labs will
vary from one to the other, however,
the need for certain analyses and the
budget of each lab determines the
availability of the departments.
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ForensicLaboratory
A chemistry unit is present in any laboratory and is
used to test samples of:-
• Blood and urine for alcohol,
• Drugs and poisoning.
• Synthetic materials such medicines,
• Dyes and stains.
Specialists in the area of chemistry also rely on FTIR,
gas chromatographs, mass spectrometers, atomic
absorption and microscopes to identify chemicals.
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ForensicLaboratory
Utility Services:
• Utility connections in
Laboratory space types can
include vacuum,
• Pneumatic supply,
• Natural gas, O2 and CO2,
• Required cylinder,
• And distilled water.
The fittings and connections for each
module.
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ForensicLaboratory
• Design the furniture's.
• Design depending on the available
spaces.
• Isolation of preparation area.
• Size of instruments.
• Sequence of test methods.
• Safety regulations.
• Prevent interference bet. Labs.
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ForensicLaboratory
Two main classes of chemical compounds,
Organic compounds
• Are based on carbon
and are found in living things.
Inorganic compounds
• Are those based on other elements.
• From the point of view of forensic science, both organic and
inorganic compounds are found in items of evidence.
• The techniques used for determination of chemical composition of
such evidence often depend upon whether the component
compounds are organic (derived form living tissue or material) or
inorganic.
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ForensicLaboratory
Broad classes of substances frequently found in post-mortem investigations
Gases and
volatiles
Acids Neutrals Bases Metals
Alcohols,
chlorinated
hydrocarbons,
aromatic
hydrocarbons,
carbon
monoxide,
cyanide
Barbiturates,
salicylates,
paracetamol
(acetaminophen)
Glutethimide,
ethchlorvynol,
meprobamate,
carisoprodol
Cocaine,
propoxyphene,
opium alkaloids,
antidepressants,
benzodiazepines
Heavy metals
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ForensicLaboratory
Type Quantity Analysis
Blood (heart, femoral) 20 ml Volatiles, drugs
Urine 20 ml Drugs, heavy metals
Bile 20 ml Narcotics, other drugs
Kidney Entire In absence of urine
Liver 20 g Many drugs
Gastric contents Total Drugs taken orally
Vitreous humor Both eyes
Alcohol, glucose, drugs and
electrolytes
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ForensicLaboratory
Pathological observation Possible cause
Burns around mouth, lips, nose Acids
Skin of face and neck quite dark Aniline, nitrobenzene
Severe, unexplained diarrhea
Metals (arsenic, mercury, copper,
etc.)
Pupil of eye dilated
Atropine (Belladonna),
Scopolamine
Burns around mouth, lips, nose Bases (lye, potash, hydroxides)
Odor of disinfectant Carbolic acid or other phenol
Skin is bright cherry red Carbon monoxide
Quick death, red skin, odor of peach Cyanide
Vomiting, abdominal pain Food poisoning
Diarrhea, vomiting, abdominal pain Metallic compounds
Convulsion Nicotine
Odor of garlic Oxalic acid, phosphorous
Convulsion Sodium fluoride
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ForensicLaboratory
• All methods are standard methods.
• The selected methods will be suitable
for Lab samples.
• Reference for all methods.
• QC applications for Methods of analysis.
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ForensicLaboratory
All the required instruments chosen
according to:
• Test methods.
• Up to date version.
• Good reputation instrument
manufactures.
• Technical Comparisons results
between suppliers.
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ForensicLaboratory
• There are thousands of possible
substances that could be encountered
in poisoning or drug overdose cases and
millions of possible substances that
could be found in non-biological
samples.
• There are techniques for the analysis of
almost all of these, but without a short
list of possible agents it would be a
very difficult task to decide what to
look for and what technique to use.
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ForensicLaboratory
• Some of the more common analytical techniques used in forensic
toxicology
Compound Sample nature Method
Gases & Volatile
Compounds
Simple mixtures, known compounds GC
"
Complex mixtures, unknown
compounds
GC / MS
Non-volatile organic
compounds
Simple mixtures, known compounds HPLC
"
Complex mixtures, unknown
compounds
LC / MS
Toxic Metals AAS / ICP
43.
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ForensicLaboratory
All the required instruments chosen
according to test methods:
1. FTIR.
2. GC/MC.
3. LC/MS
4. HPLC
5. Microscope.
6. Atomic Absorption.
7. ICP – ICP/MS
8. Others instruments.
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ForensicLaboratory
• FTIR Spectroscopy is a molecular
spectroscopy which is used to characterize
both organic and inorganic evidence.
• The sample is bombarded with infrared
radiation.
• When the frequency of the infrared
radiation matches the natural frequency of
the bond, the amplitude of the vibration
increases, and the infrared is absorbed.
• The output of an infrared
spectrophotometer is a charts.
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ForensicLaboratory
FTIR is a valuable forensic technique because of its detection
sensitivity and versatility.
Chemicals from a variety of sample types including :
• Blood,
• Paints,
• Polymer coatings,
• Drugs and
• Both organic and inorganic
contaminants can be identified
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ForensicLaboratory
The GC/MS is comprised of two parts:
• The gas chromatograph / the mass spectrometer.
• The gas chromatograph functions by separating the
molecules within the sample compound into their
most elemental particles, allowing some types of
molecules to pass into the mass spectrometer more
rapidly than others.
• When the molecules move into the mass
spectrometer, they are broken down into ionized
fragments, and then each molecule is specifically
identified based on mass and ionic charge.
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ForensicLaboratory
• The mass spectrum for 2,6-
dimethylaniline is shown below the
chromatogram as an example.
• Peaks in the mass spectrum are
representative of fragments from the
parent compound induced by the
instrument during detection.
• Every compound gives a unique mass
spectrum, thus allowing for structural
assignments to be made.
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ForensicLaboratory
1. A small sample of compound is
ionized, usually to cations by loss of an
electron.
2. The ions are sorted and separated
according to their mass and charge.
3. The Mass Analyzer to separated ions
are then detected and tallied, and the
results are displayed on a chart.
4. The Detector
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ForensicLaboratory
Forensic applications of GC/MS include
identification and detection of :-
• Explosives,
• Investigations of arson,
• Fire, and blasts or explosions,
• Environmental analysis,
• And drug detection.
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ForensicLaboratory
• In LC–MS, there has been an explosion
in the range of new products available
for solving many analytical problems,
particularly those applications in which
non-volatile, labile and/or high
molecular weight compounds are being
analyzed.
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ForensicLaboratory
• LC–MS is a well-established technique
for explosives in associated complex
matrices such as post-blast residues
and in environmental samples such as
soil and plant material extracts.
• LC–MS to enable unambiguous
differentiation
• between structurally related textile
dyes which were previously
indistinguishable by UV–VIS absorption
profile or by micro spectrophotometry.
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ForensicLaboratory
• High-performance liquid
chromatography (HPLC; formerly
referred to as high-pressure liquid
chromatography),
• Is a form
of liquid chromatography where the
high pressure used to separate the
mixture components, then identify,
and quantify
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ForensicLaboratory
• Visible microspectrophotometry is a
very useful tool in the forensic analysis
of many kinds of trace evidence.
• It combines a microscope with a
spectrophotometer so that the light
absorption properties of a very small
sample can be recorded.
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ForensicLaboratory
The technique is particularly valuable in the
investigation of:-
• Hair,
• Textile fibers,
• Paint,
• Colored inks
which are typically of microscopic dimensions.
A fiber, for instance, may have a diameter of only
around 20 micrometers.
62. 62
ForensicLaboratory
• A technique for determining the
concentration of a particular metal
element in a sample.
• The technique can be used to
analyze the concentration of over
70 different metals in the prepared
solution.
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ForensicLaboratory
• Qualitative Analysis of an Inorganic
Compound
• A poison is a substance that can cause,
to an organism, injury, illness or death
when a sufficient quantity is present.
• This indicates that any chemical
substance in sufficient quantities can
act as a poison even table salt.
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ForensicLaboratory
• There are 35 metals that concern us because of occupational or
residential exposure; 23 of these are the heavy elements.
• Or "heavy metals": antimony, arsenic, bismuth, cadmium, cerium,
chromium, cobalt, copper, gallium, gold, iron, lead, manganese,
mercury, nickel, platinum, silver, tellurium, thallium, tin, uranium,
vanadium, and zinc .
• Interestingly, small amounts of these elements are common in our
environment and diet and are actually necessary for good health, but
large amounts of any of them may cause acute or chronic toxicity
(poisoning).
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ForensicLaboratory
Forensic and clinical applications
• Blood, urine, serum, tissue, bone and
hair, Al, Cr, Cu, Zn, As, Se, Cd, Pb, Hg
• Some elements toxic Al, As, Cd, Hg,
Pb
• Some essential Se, Fe, Zn, Cr
• Some vital at low levels, toxic if high
Cu, Zn, Se
67. 67
ForensicLaboratory
Inductively Coupled Plasma – Atomic Emission
Spectroscopy (ICP-AES),
• It is a multi-element analysis technique
that will dissociate a sample into its
constituent atoms and ions and exciting
them to a higher energy level.
• Cause them to emit light at a characteristic
wavelength , which will be analyzing
68. 68
ForensicLaboratory
Steps
• Plasma will dissociate a sample into
atoms , ions.
• Exciting them to a higher energy level.
• Atoms and ions emits light at a
characteristic wavelength .
• The emitted light, will be analyzing .
The instrument will know the
concentration of metals inside the sample,
using standard solutions.
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ForensicLaboratory
The iCAP 7000 spectrometer consists of several
major components:
• Sample introduction parts. Plasma torch.
• Gas control.
• Radio frequency power generator.
• Optical system; Polychromator.
• CID detector with thermoelectric cooling.
• Interlocks.
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ForensicLaboratory
• All chemicals prepared according to the
stander methods of analysis.
• The purity of required chemicals.
• Quantities of chemicals per one year.
• MSDS for all chemicals.
• Hazardous notes about all chemicals.
• Quantities of chemicals per one year.
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ForensicLaboratory
• All Glass ware prepared according to
the stander methods of analysis.
• The grid of required glass wares.
• Amounts of glass wares.
• Storage requirements for items.
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ForensicLaboratory
The training of all staff on:
• SOP’s
• Selected instruments.
• Methods of analysis.
• Sampling.
• Preparation of samples.
• QC of the tests.
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ForensicLaboratory
The specific questions that must be answered are
whether the concentrations of any analyte or
combinations of analytes were:
• Sufficient to cause the death?
• Sufficient to have affected the actions of the
decedent so as to have caused the death?
• Insufficient to have any involvement in the
cause of death?
• Insufficient to protect the individual from an
underlying mechanism of death such as an
epileptic seizure?