Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD

Document Type : Original Article

Authors

1 Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Egypt

2 Pesticides Residues and Environmental Pollution, Central Agricultural Pesticides Laboratory, Agricultural Research Center, Giza, Egypt

3 Lecture Assistant Economic Entomology and Pesticides (Pesticides Branch) Faculty of Agriculture, Cairo University

Abstract

Determination of dinotefuran and thiamethoxam residues levels in pepper samples which were collected randomly at 0, 1, 3, 5, 7, 10, 15 and 21 days after treatment using quick, easy, cheap, effective, rugged, safe (QuEChERS) method and cleanup step utilizing solid-phase extraction (SPE) followed by determined by high-performance liquid chromatography with diode-array detection (HPLC/DAD). Dinotefuran and thiamethoxam were recovered within 77-80% and 78-112%, respectively at the spike levels (0.01 - 1 mg/kg) in pepper samples with relative standard deviations (RSDs) lower than 3%. Good linearity was achieved for dinotefuran and thiamethoxam with an excellent correlation coefficient of R2 > 0.996 and the matrix matched calibration also showed good linearity with determination coefficients R2 > 0.98. The initial deposits of dinotefuran and thiamethoxam in pepper fruits were 6.59 and 1.38 mg/kg, respectively. The half-life period (RL50) of tested pesticides on pepper fruits were 2 and 3.11 days for dinotefuran and thiamethoxam, respectively. According to maximum residue level (MRL) (0.01 mg/kg for dinotefuran and 0.7 mg/kg for thiamethoxam) the pre-harvest interval (PHI) was 11 and 4 days, respectively.

Keywords

Main Subjects

Files

Cited by

History

  • Receive Date: 31 January 2018
  • Revise Date: 26 February 2018
  • Accept Date: 27 February 2018

Share

How to cite

Statistics