Sampling and Subsampling

Subsampling

This is the process of removing a sample aliquot for preparation and measurement from an individual sample or the aggregate sample submitted for analysis. Obtaining a representative sample is the goal and homogeneity is the primary concern, not only for the original sample collection, but the subsampling as well. The smaller the sample aliquot, the greater the risk of achieving subsampling errors that will significantly influence the accuracy of the analysis. Subsampling may involve an attempt to homogenize the sample by grinding, sieving, blending, or mixing the original sample.

Contamination is of particular concern when the sample is handled, ground, sieved, etc. Therefore, trace analysts should be versed on the contaminants resulting from the use of various ball mills and grinders. The use of Nylon sieves will eliminate contamination risks for all metals and non-metals, except carbon.

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