TITLE

Evaluation of a multiresidue method for measuring fourteen chemical groups of pesticides in water by use of LC-MS-MS

AUTHOR(S)

Carvalho, J. J.; Jerónimo, P. C. A.; Gonçalves, C.; Alpendurada, M. F.

PUB. DATE

November 2008

SOURCE

Analytical & Bioanalytical Chemistry;Nov2008, Vol. 392 Issue 5, p955

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

European Council Directive 98/83/EC on the quality of water intended for human consumption brought a new challenge for water-quality control routine laboratories, mainly on pesticides analysis. Under the guidelines of ISO/IEC 17025:2005, a multiresidue method was developed, validated, implemented in routine, and studied with real samples during a one-year period. The proposed method enables routine laboratories to handle a large number of samples, since 28 pesticides of 14 different chemical groups can be quantitated in a single procedure. The method comprises a solid-phase extraction step and subsequent analysis by liquid chromatography-mass spectrometry (LC-MS-MS). The accuracy was established on the basis of participation in interlaboratory proficiency tests, with encouraging results (majority | z-score| <2), and the precision was consistently analysed over one year. The limits of quantitation (below 0.050 μg L−1) are in agreement with the enforced threshold value for pesticides of 0.10 μg L−1. Overall method performance is suitable for routine use according to accreditation rules, taking into account the data collected over one year. [Figure not available: see fulltext.]

ACCESSION #

34851676

 

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