Determination of Dinotefuran and Thiamethoxam Residues in PepperFruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD
| Autor: | Dalia elhafny, El-Desouki Sabri Ibrahim, Mansour Rabie, Mohammed Bayoumi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Residue (complex analysis)
Chromatography 010401 analytical chemistry Extraction (chemistry) 04 agricultural and veterinary sciences Pesticide Quechers 040401 food science 01 natural sciences High-performance liquid chromatography Dinotefuran 0104 chemical sciences chemistry.chemical_compound 0404 agricultural biotechnology chemistry Pepper Thiamethoxam |
| Zdroj: | Egyptian Journal of Chemistry. 61:220-230 |
| ISSN: | 2357-0245 |
| DOI: | 10.21608/ejchem.2018.2803.1227 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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