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An interlaboratory study to evaluate potential matrix reference materials for herbicides in water.

K El Mrabet¹, M Poitevin, J Vial

¹Laboratoire Environnement et Chimie Analytique, Ecole Supérieure de Physique et Chimie Industrielles de la Ville de Paris, 10 Rue Vauquelin, 75005 Paris, France.

Journal of Chromatography. A

|October 19, 2006

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New matrix reference materials (MRMs) for herbicide determination in water show promising stability. A collaborative study found these pesticide-containing materials suitable for analytical protocol validation, paving the way for certification.

Area of Science:

Environmental Chemistry
Analytical Chemistry
Reference Material Development

Background:

Matrix reference materials (MRMs) are crucial for validating analytical methods.
Currently, no MRMs exist for determining herbicides in water samples.
Pesticide stability in acetonitrile and on solid-phase extraction (SPE) cartridges suggests potential as reference materials.

Purpose of the Study:

To evaluate candidate matrix reference materials for herbicide analysis in water.
To assess the behavior and stability of pesticides in proposed reference materials.
To determine the suitability of these materials for liquid chromatography analysis.

Main Methods:

Candidate MRMs were prepared using pesticides (triazines and phenylureas) in acetonitrile and on SPE cartridges.

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A collaborative study involving 15 laboratories was conducted to analyze the candidate materials.

Pesticides were analyzed directly from acetonitrile solutions, after preconcentration from spiked water on SPE cartridges, and after elution from pre-treated SPE cartridges.

Main Results:

Reproducibility was observed to be 16.1% for direct analysis of pesticides in acetonitrile (approx. 0.125 mg/L).
Reproducibility was 29.2% for water samples spiked with pesticides (approx. 0.5 µg/L) analyzed after SPE preconcentration.
Reproducibility was 26.7% for SPE cartridges pre-treated with pesticide-containing water (250 mL at approx. 0.5 µg/L each) analyzed after elution.

Conclusions:

The observed dispersion values are compatible with the requirements for certifying these materials.
Pesticide-containing acetonitrile solutions and SPE cartridges demonstrate satisfactory stability and are viable candidates for MRMs.
This study supports the development of essential reference materials for herbicide determination in water.