Dissipation Characteristics of Insecticide Phenthoate in Minor Crop Millet during Cultivation

Phenthoate;PHIs;LC-MS/MS;GC-µECD;Dissipation;Minor crop;Millet;Soil;Half-life;630

농업생명과학대학 농생명공학부 ;

University:서울대학교 대학원

关键词: Phenthoate;    PHIs;    LC-MS/MS;    GC-µECD;    Dissipation;    Minor crop;    Millet;    Soil;    Half-life;    630;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/137573/1/000000146055.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

14/7 days before harvest) by three replicates. The residue of the pesticide was analyzed by LC-MS/MS and method limit of quantitation (MLOQ) were 0.01 mg/kg. The linearity (r2) of calibration curve was ≥ 0.999 at the calibration range of 0.005-0.5 grade g/mL. After harvest, maximum phenthoate residues in plot 1 were 0.02 mg/kg in both of grain and straw. In plot 2 the residues were 0.15 mg/kg (grain) and 0.04 mg/kg (straw), while the residue in plot 3 were 0.61 and 0.18 mg/kg in grain and straw, respectively. In plot 4, 0.72 mg/kg (grain) and 0.38 mg/kg (straw) of residue were observed. These results will be used for establishing pre-harvest interval (PHI) of phenthoate during cultivation of millet. The dissipation pattern and half-life of phenthoate in soil was also evaluated in laboratory condition. Ten grams of soils which were fortified with phenthoate standard solution at the concentration of 0.75 mg/kg were incubated at 25℃ in the dark condition. The soil samples were collected at 0 hr, 2 hr, 6 hr, 12 hr, 24 hr (1 days), 48 hr (2 days), 72 hr (3 days), 120 hr (5 days), 168 hr (7 days), 336 hr (14 days), and 672 hr (28 days) after treatment. The residue of the pesticide was analyzed by GC-µECD (Agilent-7890). The MLOQ was 0.005 mg/kg. The linearity (r2) of calibration curve was ≥ 0.999 at the calibration range of 0.005-0.5 µg/mL. The phenthoate was dissipated rapidly in soil with the dissipation curve of y=556.09e-0.009x (r2=0.9796) while the 77.0 hours (3.2 days) of 1º-half-life was determined.