Control matrix materials are necessary to support pesticide residue analytical research in generating method validation, field fortification, storage stability, and procedural recovery samples, among other uses. Obtaining matrix materials suitable for use in determining trace-level pesticide residues is a critical consideration for evaluation and control of analytical method performance. While it is desirable to have available control matrix materials which are representative of the crop group, homogenous, and free of analyte contamination, this is not always possible in the context of conducting field residue trials. In this presentation, alternatives for sourcing and evaluating matrices will be addressed. Strategies for dealing with inconsistencies in analyte recovery and interferences between specific matrix types within crop groups will be presented. Potential pitfalls and management of using field trial controls for analytical procedural recovery samples will also be discussed.

Matrix characterization: Challenges in obtaining and screening control sample materials suitable for use in pesticide residue analysis

246th National Meeting (2013)

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