Preparation of a reference material for organic contaminants in precipitation by large-sample extraction / D.H.J. Anthony and K.I. Aspila. : En13-5/93-73E-PDF

"The determination of ambient levels of hydrophobic organic contaminants in aqueous matrices suffers from the lack of a standard reference material (SRM), prepared from "real" environmental matrices, for use as a QA/QC material by environmental analytical laboratories responsible for providing data for monitoring, surveillance, and regulatory activities. Such reference materials cannot be prepared in an aqueous matrix by virtue of the properties of the analytes. This report describes a technique for preparation of a reference material in the "next best" matrix, an organic solvent. This is the matrix in which such analytical determinations are ultimately made. The technique serves as an example of how the Goulden Large-Sample Extraction (GLSE) process may be used to prepare reference materials of most environmental aqueous matrices. It allows processing of a 1000 L sample within a period of fifteen working hours, producing twenty litres of extract material. This amount of extract is sufficient to provide one hundred 200 mL subsamples for use as a reference material for a particular program"--Abstract.

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