Inter-laboratory validation of solid-phase microextraction for the determination of triazine herbicides and their degradation products at ng/1 level in water samples

Roberto Ferrari, Torben Nilsson, Rocco Arena, Patrizia Arlati, Gianluca Bartolucci, Romilde Basla, Fabio Cioni, Giuseppe Del Carlo, Pierluisa Dellavedova, Elena Fattore, Martino Fungi, Christoph Grote, Maurizio Guidotti, Stefania Morgillo, Laura Müller, Marco Volante

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Abstract

The accuracy and precision of solid-phase microextraction (SPME) were validated in an inter-laboratory study including ten laboratories for the analysis of triazine herbicides and their metabolites at ng/l level in aqueous samples. The SPME conditions were optimised in order to obtain maximum sensitivity. Especially, salt addition and choice of the SPME fibre coated with Carbowax-divinylbenzene increased the sensitivity. The average detection limits were in the range from 4 to 24 ng/l for the triazine herbicides, and 20 and 40 ng/l for desisopropylatrazine and desethylatrazine, respectively. The average r 2 values of the calibration curves were above 0.99 for all of the analytes. The statistical data treatment was performed in accordance with the International Standardisation Organisation (ISO) standard 5725. Relative repeatability standard deviations between 6 and 14% and relative reproducibility standard deviations between 10 and 17% were found. The determined concentrations of the reference sample compared well to the 'true' values, thus proving the good accuracy of the method. It is concluded that SPME is a reliable technique for the quantitative analysis of water samples containing triazine herbicides in concentrations around the European limit of 100 ng/l for individual pesticides in drinking water.

Original languageEnglish
Pages (from-to)371-376
Number of pages6
JournalJournal of Chromatography A
Volume795
Issue number2
DOIs
Publication statusPublished - Feb 6 1998

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Keywords

  • Pesticides
  • Solid-phase microextraction inter-laboratory study
  • Triazines

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Ferrari, R., Nilsson, T., Arena, R., Arlati, P., Bartolucci, G., Basla, R., Cioni, F., Del Carlo, G., Dellavedova, P., Fattore, E., Fungi, M., Grote, C., Guidotti, M., Morgillo, S., Müller, L., & Volante, M. (1998). Inter-laboratory validation of solid-phase microextraction for the determination of triazine herbicides and their degradation products at ng/1 level in water samples. Journal of Chromatography A, 795(2), 371-376. https://doi.org/10.1016/S0021-9673(97)00837-6