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.

Field and Sampling Issues that Affect Laboratory Measurements), sample screening activities, and objectives given in the appropriate planning documents. The laboratory sample preparation techniques presented in this chapter include the . Contents . physical manipulation of the sample (heating, screening, grinding, mixing, etc.) up to the

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