Pesticide Residue Analysis Laboratory, Department of Entomology, Punjab Agricultural University, Ludhiana, India.
J Environ Sci Health B. 2012;47(1):42-50. doi: 10.1080/03601234.2012.607765.
Dissipation of β-cyfluthrin and imidacloprid in okra was studied following three applications of a combination formulation of Solomon 300 OD (β-cyfluthrin 9 % + imidacloprid 21 %) @ 60 and 120 g a.i. ha(-1) at 7 days interval. Residues of β-cyfluthrin and imidacloprid in okra were estimated by gas liquid chromatography (GLC) and high performance liquid chromatography (HPLC), respectively. Residues of β-cyfluthrin were confirmed by gas chromatograph-mass spectrometry (GC-MS) and that of imidacloprid by high performance thin layer chromatography (HPTLC). Half-life periods for β-cyfluthrin were found to be 0.91 and 0.68 days whereas for imidacloprid these values were observed to be 0.85 and 0.96 days at single and double the application rates, respectively. Residues of β-cyfluthrin dissipated below its limit of quantification (LOQ) of 0.01 mg kg(-1) after 3 and 5 days at single and double the application dosage, respectively. Similarly, residues of imidacloprid took 5 and 7 days to reach LOQ of 0.01 mg kg(-1), at single and double dosages respectively. Soil samples collected after 15 days of the last application did not show the presence of β-cyfluthrin and imidacloprid at their detection limit of 0.01 mg kg(-1).
在 7 天的间隔内，三次应用 Solomon 300 OD（β-氯氟氰菊酯 9％+吡虫啉 21％）@60 和 120 g ai ha(-1)的组合配方后，研究了在秋葵中 β-氯氟氰菊酯和吡虫啉的消解情况。通过气相色谱（GLC）和高效液相色谱（HPLC）分别估计秋葵中 β-氯氟氰菊酯和吡虫啉的残留量。β-氯氟氰菊酯的残留量通过气相色谱-质谱（GC-MS）确认，吡虫啉的残留量通过高效薄层色谱（HPTLC）确认。在单倍和双倍应用率下，β-氯氟氰菊酯的半衰期分别为 0.91 和 0.68 天，而吡虫啉的半衰期分别为 0.85 和 0.96 天。在单倍和双倍施用量下，β-氯氟氰菊酯的残留量在 3 和 5 天后分别低于其定量下限（LOQ）0.01 mg kg(-1)。同样，吡虫啉的残留量需要 5 和 7 天才能达到其定量下限（LOQ）0.01 mg kg(-1)，分别在单倍和双倍剂量下。最后一次施药后 15 天采集的土壤样品未在其检测限 0.01 mg kg(-1)处显示出β-氯氟氰菊酯和吡虫啉的存在。
