Exp. 2 Prelab - 2. All sampling steps are needed to convert...

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Jennie Senter 1/30/08 Experiment 2 Sampling in Analytical Chemistry 1. From the lot (total material), take a representative bulk sample. This must be representative of the lot. From this sample, a smaller, homogeneous laboratory sample must be formed that has the same composition as the bulk sample. Smaller portions of the laboratory sample, called aliquots are used for individual analyses. The specifics of how the bulk sample, laboratory sample, and aliquots are obtained vary from sample-to-sample and experiment-to-experiment. For example, some material may need to be ground into a fine powder and then dissolved into solution in order to be analyzed, while others may require a different method.
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Unformatted text preview: 2. All sampling steps are needed to convert a representative bulk sample into a form suitable for chemical analysis. 3. The bulk sample is taken from the lot. From this bulk sample, one obtains the smaller laboratory sample. 4. The laboratory sample is the same consistency and representation of the bulk sample. From this, one derives an aliquot which has been converted into a form suitable for chemical analysis (such as being ground into a powder). 5. In choosing a representative sample, the sample must replicate the populations chemical composition, and relative sizes of the different layers must be made and included in the calculations....
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This note was uploaded on 08/28/2008 for the course CHEM 319 taught by Professor Nyssen during the Spring '08 term at University of Tennessee.

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