Volume 27, Number 3, April 1999Isotopic analysis
|Page(s)||271 - 280|
High-performance liquid chromatography coupled with mass spectrometry applied to analyses of pesticides in water. Results obtained in HPLC/MS/APCI in positive modeR. Jeannot and E. Sauvard
BRGM, Service Minier National, Département Analyse et Caractérisation Minérale, BP. 6009, 45060 Orléans Cedex 02, France
Determinations of pesticides and their degradation products in natural waters, given the great heterogeneity of the substances involved, conventionally demands the use of the following analytical methods:
gas chromatography with different specific detectors such as the electron capture detector, NPD thermo-ionic detector, and mass spectrometry,
high-performance liquid chromatography combined with a diode array ultraviolet detector or a spectrofluorimeter after derivatization,
thin-layer chromatography (TLC) with detection of the isolated substances by UV.
With liquid chromatography, the most widely used detector is the diode-array UV detector. This method, recommended in French standard AFNOR T 90 123 (EN ISO 11369) , represents a significant advance in the approach to the identification of polar substances detected in unknown samples, compared with the results obtained by UV detection with a single wavelength. However, this method of detection does not guarantee the identification of the detected substances in absolute terms. Confirmation on a second column or by gas chromatography is therefore necessary.
Key words: HPLC / mass spectrometry / atmospheric interface / APCI / pesticides / waters.
© EDP Sciences, Wiley-VCH 1999
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