The document describes the specifications for an atomic absorption spectrophotometer used to analyze trace metals and other elements in water and sediment samples. Key features include the ability to measure multiple elements rapidly from a single sample using 4 or more lamp positions. It must be PC-controlled with automatic wavelength selection and calibration. Safety features automatically shut down gases if a flame is not detected. The system includes an integrated flame and graphite furnace with autosampler capable of analyzing up to 50 samples per hour. Required accessories include lamps, gases, regulators, and a 2-year supply of recommended consumables.

1. ATOMIC ABSORPTION SPECTROPHOTOMETER
Purpose
For analysis of trace metals and other elements in water and sediment samples. Fully
automated PC controlled true double beam Atomic Absorption Spectrophotometer with
absorption and emission capability with deuterium background correction and should have
the capability of measuring multi elements in rapid sequence in single sample measurement,
fitted with 4 or more lamp position and choice of manual or automatic lamp selection with
following features:
Conditions & Requirements
• Installation, commissioning and training in operational use shall be by supplier.
• At least 5 years of after sales service shall be guaranteed
Specifications
General Features • Automatic wave length and slit selection
• Wide range and high sensitivity photomultiplier for maximum
signal to noise ratio
• Choice of burner type (air/acetylene or nitrous oxide)
• Deuterium background correction. Range 185-425 mm to 2.3
Abs. Electronic modulation with automatic attenuation
• Integrated built-in Flame and Graphite Furnace along with auto-
sampler.
• It should be automatically aligned in the path by using the
software.
Spectrophotometer • Type: PC-controlled
• Optics: hollow cathode lamps, double beam, narrow beam
optics matches flame profile.
• Hollow Cathode Lamp or Electrode Less Discharge (EDL)
Lamp
• All reflective system with quartz over-coating on mirrors.
• Sealed against dust and vapour
• Wave length range: 180 to 900 nm
• Slit 0.2 to 2 nm with automatic and manual choice
Monochromator • Monochromator with computer controlled wavelength selection
and peaking

2. • The system should be based on abrasion corrected Cnerny-
Turner Grating (holographic diffraction grating) up to 1800
grooves per mm blazed at 240 nm
• Continuously adjustable silts with 0.2 to 2 nm spectral
bandwidth
Sensitivity • At least 0.7 Abs
Absorption Cell • Quartz
Lamp turret • At least 4 lamps with automatic Turret controlled with software
and auto-alignment
Gas supply • 0 to 120 ml/min
Gas Control • Automatic – preset oxidant flow and variable full flow adjusted
using manual flow meter adjustment. Automatic oxidant change
over
• Fully automatic gas box with computer-controlled oxidant
selection, automatic gas sequencing, oxidant and fuel
monitoring and control
• Actuated ignition with air/acetylene. Acetylene flow should be
automatically adjustable when switching to or from nitrous-
oxide/acetylene operation
Flame control • Programmable and manual oxidant and fuel selection and
• Monitoring
• Safety interlocks
• Safe and automatic shutdown in case of power failure
Safety system • Separate ignite/flame off buttons. Safety interlocks to monitor
burner type, burner fitting, liquid trap, pressure relief bung,
flame shield, flame operation, main power, oxidant pressure and
deuterium lamp cover
• Fully interlocked operation preventing ignition if proper burner
head, nebulizer, end cap or burner drain system are not correctly
installed, the level of liquid in the drain vessel is incorrect or gas
pressures are too low
• The interlocks should be with automatically shut down the gases

3. if a flame is not detected
• In the event of power failure or when the emergency flame off
button is used, the flame should be automatically and safely
extinguished
Spray chamber • Solid poly-propylene or fluorinated HDP or equivalent
• Or fluorinated high density polyethylene for aqueous and
organic solutions
Burner • All titanium or equivalent, for air-acetylene and nitrous oxide-
acetylene flames or air/acetylene burner with Teflon shield.
• Burner system chamber should provide analysis of corrosive
and high solid matrices
• Automatic burner rotation system
• Interchangeable full titanium nebulizer for organic and acidic
purpose and burner head for 50 mm and 100 mm, facilities
should be there to switch from Flame to Graphite within few
seconds without removing the air acetylene or nitrous oxide
burner.
Mixing paddles • Removal twin headed mixing paddles fitted inside the spray
chamber for better mixing and extend operation with high
dissolved solids solution
Impact bead • Externally adjustable glass impact bead (Teflon bead)
Hydride
Generator
• Hydride generator (for AS, Se, Hg at ppb level), automatic and
computer controlled
• Sample should be injected through the peristaltic pump, 3
channel peristaltic pump with heated quartz cell, fast heating
rate, temperature range should be from 100 to 1000 degree
Celsius
• Typical precision 1-2% RSD with sample through put of 50
samples/hour determined in triplicate
Graphite Furnace • Built-in integrated furnace with flame facility to switch from
flame to graphite within few seconds without removing the air
acetylene or nitrous oxide burner
• It should automatically align in optical path by using the

4. software
• It should have fully automated constant temperature zone with
dynamic feedback temperature control, cooling water
temperature compensation, upto 20 steps per program,
temperature programmable from 40 to 3000o
C with maximum
heating rate up to 2000o
C, choice of two inert gases with
programmable flow rate, solid titanium work head for maximum
corrosion resistance, quartz and windows for high light energy,
comprehensive safety interlocks for gases, water flow, tube and
transformer temperature, DC Power supply used for Graphite
Furnace with strict electromagnetic compatibility
• Spray chamber: solid polypropylene of fluorinated HDP or
equivalent
• Recirculating Water chiller: with flow rates of 1.5-2 L/Min at
175-200 kPa for cooling of Graphite Furnace must be quoted
from manufacturer
• Autosampler for Graphite Furnace: Automatic programmable
sample dispenser for GTA 50 samples in 2 mL vials, 5 25 mL
vessels for bulk solutions, automatic preparation up to 10 points
calibration, hot injection automatic flow through rinsing
• Easy access for graphite tube replacement with built-in tube
usage counter should be available
• Auto sampler should be provided with graphite furnace
Operational
requirement
Background correction:
• Sensitivity: 0.7 absorbance or better for 5 ppm Cu
• Calibration: automatic, using up to 6 standards and re-
calibration with single standard
Power supply • 220 ±10 VAC, 47 to 53 Hz
Typical
performance
• Greater than 0.8 Absorbance with precision of <0.5% RSD from
ten 5 sec integration for 5 mg/l Cu solution
Other
requirements
• PC Compatible for operation control and monitoring of AAS
and necessary modules with latest configuration and software,
core 2 DUO processor, 3 GHz, 2 GB DDR RAM, 48x CD ROM
Drive, 320 GB HDD, 17” TFT Colour Monitor, 104 key board,
optical mouse, Window 7 and licensed MS Office with CD,
serial and parallel ports, DeskJet colour printer with suitable

5. stabilizer
• Software performing analyses at least as per DIN/ISO/US-EPA,
control of flame, calibration, blank correction, data import,
export, handling and reporting, quality control protocols,
computer based training
• All the methods, parameters related to lamp selection,
calibration, control of flow gases should be through window-
based software. It should have programmable and computer
controlled gas control, both air acetylene/nitrous oxide. System
should have all safety features required for the system. The unit
should be operated with Windows software controlling analyser,
setting-up the method parameters, analysing the samples,
performing calibrations. The verification kit STD for Cu to
check performance periodically to be included in offer.
Accessories • Hollow cathode lamps for Ag, As, Cd, Cr, Cu, Mn, Ni, Hg, Pb,
Se and Zn
• Gas filter station with control box
• Acetylene and nitrous oxide gases with cylinders
• Argon gas with cylinder and regulator required for hydride
system
• Fume hood and ducting with exhaust provision
• Air compressor
• Vent and hood assembly
• Nitrous oxide, acetylene and nitrogen two stage gas regulators
with necessary tubing and connectors, nitrous oxide regulator
should be with heater
• Air compressor with air filter or equivalent operation,
maintenance, service and analytical manuals, including
applications for flame and hydride units
• Spare nebuliser with capillary, flow spoiler, impact bead, O ring
kit for nebuliser, burner gasket kits for air- and nitrous oxide-
acetylene, additional spares and
• Dust covers

6. • 10 KVA online UPS with 30 minutes back-up
• Colour monitor
• Printer
• Complete operational manual
Consumables • Consumables for two year operation as recommended
considering expiry dates