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Comparison of LC and Partial Least-Squares Calibration for Analysis of Three Leachable Pesticides in Groundwater

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Abstract

The resolving power of liquid chromatography and partial least-square (PLS-1) calibration has been compared for simultaneous analysis of three leachable pesticides, atrazine, methidathion, and propoxur, in groundwater. The chromatographic method outperformed PLS-1 for analysis of the pesticides, for which spectral overlap is substantial (30–75%). After application of a liquid–liquid extraction step, both methods could be used to quantify 500 ng L−1 of the pesticides with recovery in the ranges 92.8–95.6% for PLS-1 and 97.6–99.3% for chromatography, and RSD in the ranges 6.9–8.6% for PLS-1 and 1.9–3.4% for chromatography. The better performance of the chromatographic method was attributed to separation of groundwater constituents from the pesticides before quantification, which was not possible with the PLS-1 method. Despite the superiority of the chromatographic method, PLS-1 seems a reasonable and inexpensive substitute for chromatography.

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Acknowledgments

The financial support from the Deanship of Academic Research/The Hashemite University is highly appreciated. The author would like to thank Dr. Amjad H. El-Sheikh for his constant help and Dr. Jamal A. Sweileh for revising the manuscript.

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Authors and Affiliations

  1. Department of Chemistry, The Hashemite University, P.O. Box 150459, Zarqa, Jordan

    Yahya S. Al-Degs

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  1. Yahya S. Al-Degs
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Correspondence to Yahya S. Al-Degs.

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Al-Degs, Y.S. Comparison of LC and Partial Least-Squares Calibration for Analysis of Three Leachable Pesticides in Groundwater. Chroma 69, 1137–1140 (2009). https://doi.org/10.1365/s10337-009-1029-8

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  • DOI: https://doi.org/10.1365/s10337-009-1029-8

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