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SECTION 1PRELIMINARY OPERATIONSOF ANALYSIS1.11.1 SAMPLING 1.21.1.1 Handling the Sample in the Laboratory 1.21.1.2 Sampling...
1.2 SECTION ONE1.1 SAMPLING1.1.1 Handling the Sample in the LaboratoryEach sample should be completely identified, tagged,...
4. The origin of the sample and cross-reference number.5. The (approximate) weight or volume of the sample.6. The identify...
occur in two distinct ways. First, errors in splitting the sample can result in bias with concentrationof one or more of t...
closed—the exit end first followed by the entrance end. The sampling of flowing gases must be madeby a device that will gi...
to the 15-lb (6.8-kg) sample, which is sent to the laboratory. Mechanical sampling machines are usedextensively because th...
sample is added to the re-formed cone, the total is mixed thoroughly and a new cone is formed priorto the addition of anot...
1.3 CRUSHING AND GRINDING1.3.1 IntroductionIn dealing with solid samples, a certain amount of crushing or grinding is some...
1.9TABLE1.1SampleReductionEquipmentHardness,CuttingJawCrossRotorCentrifugalMortarMixerBallMicroSamplecompositionmohsmillcr...
Tungsten carbide containers are the most effective and versatile of all. Containers are long wear-ing but subject to break...
1.3.2.6 Wig-L-Bug. The Wig-L-Bug is an effective laboratory mill for pulverizing and blendingsamples in quantities of 0.1 ...
particles are then reground; these steps are repeated until the entire sample passes through the screen.Screens are availa...
In order to cope with the variability in composition caused by the presence of moisture, the analystmay attempt to remove ...
1.5.2 Drying SamplesSamples may be dried by heating them to 110°C or higher if the melting point of the materialis higher ...
1.5.2.2 Humidity and Its Control. At times it is desirable to maintain constant humidity in anenclosed container. A satura...
When very small quantities of crystals are collected by centrifugation, they can be dried by sub-jecting them to vacuum in...
PRELIMINARY OPERATIONS OF ANALYSIS 1.17TABLE 1.7 Relative Humidity from Wet- and Dry-Bulb Thermometer ReadingsDry-bulbWet-...
Molecular sieves are an excellent drying agent for gases and liquids. In addition to absorbingwater, they also absorb othe...
1.5.5 Freeze-DryingSome substances cannot be dried at atmospheric conditions because they are extremely heat-sensitivemate...
Samples can be analytically dried to less than 1 mg of water in several minutes. Water selectivelyabsorbs the microwave en...
In most critical-point drying procedures an intermediate liquid is first used to displace themoisture present in the origi...
1.6 THE ANALYTICAL BALANCE AND WEIGHTS1.6.1 IntroductionIf the sample is to be weighed in the air-dry condition, no specia...
device (scale dial or digital display) and according to their weighing capacity. Balances are classi-fied in Table 1.11. V...
weights fit in a holder on the base. The aluminum beam is magnetically damped and has a spring-loaded zero adjust.1.6.2.3 ...
into a measurable single force. The platform is stabilized by flexure-pivoted guides; pivots areformed by elastically flex...
6. Full-range taring: Just set a container on the pan and touch the rezero button and the displayautomatically resets to z...
1.6.6 Air Buoyancy12In the fields of practical chemistry and technology, there is an unspoken agreement that no correc-tio...
“acceptance tolerances” for new weights. Group tolerances are defined as follows: “The correc-tions of individual weights ...
germanium (as GeCl4), lead (as PbCl4), mercury (as HgCl2), antimony (as SbCl3), silicon (as SiF4),tin (as SnCl4 or SnBr4),...
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Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
Analytical chemistry handbook
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