Transcription of 12 LABORATORY SAMPLE PREPARATION
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12 LABORATORY SAMPLE PREPARATION
Sampling SAMPLE PREPARATION Concentration, Separation, Isolation, etc. Steps Measurement (After Scwedt, 1997) FIGURE Degree of error in LABORATORY SAMPLE PREPARATION relative to other activities 12 LABORATORY SAMPLE PREPARATION Introduction On first impression, SAMPLE PREPARATION may seem the most routine aspect of an analytical protocol. However, it is critical that analysts realize and remember that a measurement is only as good as the SAMPLE PREPARATION that has preceded it. If an aliquant taken for analysis does not represent the original SAMPLE accurately, the results of this analysis are questionable. As a general rule, the error in sampling and the SAMPLE PREPARATION portion of an analytical procedure is considerably higher than that in the methodology itself, as illustrated in Figure One goal of LABORATORY SAMPLE PREPARATION is to provide, without SAMPLE loss, representative aliquants that are free of LABORATORY contamination that will be used in the next steps of the protocol.
Table 12.1 lists some commonly analyzed radioisotopes, their volatile chemical form, and the boiling point of that species at standard pressure. Note that the boiling point may vary depending upon solution, matrix, etc. Often the moisture content, and thus, the chemical composition of a solid is altered during grinding and crushing (Dean, 1995).
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