Key Laboratory of Original Agro-Environmental Quality, Ministry of Agriculture, Tianjin, 300191, China.
Bull Environ Contam Toxicol. 2013 Feb;90(2):242-7. doi: 10.1007/s00128-012-0907-1. Epub 2012 Dec 11.
Modified QuEChERS-HLPC (quick, easy, cheap, effective, rugged and safe) methods for the analysis of mesotrione in maize and soil were developed and validated. At three fortification levels of 0.01, 0.1 and 0.5 mg kg(-1) mesotrione, the recoveries of mesotrione in maize plants, maize and soil were in the range of 85.95 %-96.05 %, with relative standard deviations (RSD) of 2.89 %-9.83 %. The limit of quantification (LOQ) of method was 0.001 mg kg(-1) for maize and soil. In the supervised field trials, the degradation rates of mesotrione were described using first-order kinetics and mesotrione dissipation in maize plants coincided with C ( t ) = 1.735e(-1.0194t) with the half-life 3.94 days in Tianjin, and C ( t ) = 4.9536e(-0.7237t) with the half-life 5.10 days in Jilin. As for soil, C ( t ) = 20.272e(-1.208t) with the half-life 2.98 days in Tianjin, and C ( t ) = 5.5835e(-8141t) with the half-life 4.49 days in Jilin. At pre-harvest interval (PHI) of 0 and 20 days, the final residue levels of mesotrione could not be detected in maize and soil at the recommended dosage and 1.5 times recommended dosage.
建立并验证了用于分析玉米和土壤中麦草畏的改良 QuEChERS-HLPC（快速、简便、廉价、有效、耐用和安全）方法。在 0.01、0.1 和 0.5 mg kg(-1) 三个添加水平下，麦草畏在玉米植株、玉米和土壤中的回收率在 85.95 %-96.05 %之间，相对标准偏差（RSD）为 2.89 %-9.83 %。该方法的定量限（LOQ）为玉米和土壤中 0.001 mg kg(-1)。在有监督的田间试验中，使用一级动力学描述了麦草畏的降解率，麦草畏在玉米植株中的消解符合 C ( t ) = 1.735e(-1.0194t)，半衰期为 3.94 天，在天津，C ( t ) = 4.9536e(-0.7237t)，半衰期为 5.10 天，在吉林。对于土壤，C ( t ) = 20.272e(-1.208t)，半衰期为 2.98 天，在天津，C ( t ) = 5.5835e(-8141t)，半衰期为 4.49 天，在吉林。在收获前间隔（PHI）为 0 和 20 天时，在推荐剂量和推荐剂量的 1.5 倍下，玉米和土壤中均未检测到麦草畏的最终残留量。
