Evaluation of a modified QuEChERS method for extraction of diazinon and edifenphos from two paddy soils using HPLC-UV

Document Type : Research Paper

Authors

1 Department of Plant Protection, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

2 Department of Soil Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

Abstract

In this research, the efficiency of diazinon and edifenphos extraction from two paddy soils with different organic contents was investigated using a modified QuEChERS extraction method. The methods included extraction of 10 g soil using acetonitrile with or without the addition of water to the samples, extraction of 5 g soil using acetonitrile with the addition of water to the samples, and extraction of 5 g soil using ethylacetate with the addition of water to the samples. The clean-up was carried out using dispersive solid phase extraction (dSPE). The pesticides quantification was performed using a liquid chromatography system equipped with a UV/VIS detector. According to the results, soil organic matter contents affected the recoveries of the two pesticides significantly. Factors such as reducing the sample size to 5 g, hydrating of the samples prior to extraction, and using ethylacetate as the solvent increased the extraction efficiencies of the two pesticides significantly. Best recoveries (70-100%) and relative standards deviations (RSDs) (˂20%) were achieved using 5 g soil as the sample with the addition of water and extraction using ethylacetate. The method had a good linearity within the range of 0.5-10 µg g-1. The sensitivity of the method was confirmed by the estimated method detection and quantification limits between 0.07-0.54 µg g-1.

Keywords

References

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Plant Pest Research
Volume 7, Issue 1
June 2017
Pages 13-28

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  • Receive Date: 18 June 2017
  • Accept Date: 18 June 2017

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