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.

samples to base metals that form alloys with platinum. Porcelain should not be used for analysis of lead, uranium, and thorium because the oxides of these elements react with porcelain glazes. Increasing the amount of sample for dry ashing increases the amount of ash, minimizing the loss of the sample s trace materials to the container surface. T

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