Analysts also should consult the disclaimer statement at the front of the manual and the information in Chapter Two, Sec. 2.1, for guidance on the intended flexibility in the choice of methods, apparatus, materials, reagents, and supplies, and on the responsibilities of the analyst for demonstrating that the techniques employed are appropriate for the analytes of interest, in the matrix of interest, and at the levels of concern.
matrix， 原意是矩阵，在分析中可以翻译为矩阵，也可以翻译为介质，在UE EPA 中解释为 A specific type of medium (e.g., surface water, drinking water) in which the analyte of interest may be contained.
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