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1 Acta Chromatographica

1 2003

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Multiresidue determination of diazinon and ethion in pistachio nuts by use of matrix solid phase dispersion with a lanthanum silicate co-column and gas chromatography

Husain S. W., Kiarostami V., Morrovati M., Tagebakhsh M. R.

Acta Chromatographica

2003

No. 13

208-214

Diazinon and ethion in pistachio nuts have been analyzed by use of matrix solid-phase dispersion (MSPD) followed by gas chromatography with nitrogen-phosphorus detection (GC-NPD). The efficiency of different adsorbents (C18, cyano, phenyl, and amino) for MSPD of pistachio nuts was compared. Lanthanum silicate ion-exchanger was used as co-column material. Recoveries for C18-MSPD co-column lanthanum silicate were 95% for ethion and 94% for diazinon with relative standard deviations of 7-13% in the concentration range 0.5-4 mg kg-1. The limits of detection were 0.02 mg kg-1 for ethion and 0.035 mg kg-1 for diazinon; these were lower than the maximum residue limits (MRL) established by WHO/FAO. Thin-layer chromatography was performed on lanthanum silicate and lanthanum tungstate ion exchangers to ensure the pesticide residues were present in the final MSPD extract.