作　　者： ; ; ; (万凯）; (黄健祥）; (刘聪云）; (王富华）;

机构地区： 广东省农科院农产品公共监测中心广东广州510640

出　　处： 《广东农业科学》 2014年第8期206-208,213,共4页

摘　　要： 为了明确二氯喹啉酸在保持水层和水层自然沉降两种处理下的稻田环境中的消解趋势,于2012年在广州市进行田间试验,利用液相色谱-串联质谱法检测二氯喹啉酸在水稻田环境中的消解动态.结果显示,二氯喹啉酸在稻田水和稻田土壤样品中的检出限（LOD）分别为0.001 mg/L和0.001 mg/kg.当添加水平为0.01、0.10、1.00 mg/L或mg/kg时,二氯喹啉酸在稻田水中的回收率范围为83.93％～106.75％,相对标准偏差（RSD）为2.3％～6.3％,在稻田土壤中的回收率范围为83.23％～113.50％,RSD为2.6％～4.4％;二氯喹啉酸在稻田水和稻田土中的降解符合一级化学反应动力学方程C=Coe-kt;在保持水层的稻田中,二氯喹啉酸在田水和土壤中的半衰期分别为8.7、14.1 d,在自然沉降的稻田中,二氯喹啉酸在土壤中的半衰期为10.8 d. Degradation dynamics of quinclorac in two treatments of paddy field （maintaining the field water through necessary irrigation, named treatment A, keeping the field water in natural sedimentation, named treatment B） was studied in Guangzhou in 2012. Liquid chromatography-tandem mass spectrometry analytical method was developed to determine the residue of quinclorac in water and soil. Results showed that the limit of detection （LOD） of quinclorac in water and soil was 0.001 mg/L and 0.001 mg/kg, respectively. The average recovery rate of quinclorac was from 83.93% to 106.75% in paddy water when the spiked level was 0.0l, 0.1 and 1.00 mg/L or mg/kg, with the relative standard deviation （RSD） from 2.3% to 6.3%, and from 83.23% to 113.50% in paddy soil, with the RSD from 2.6% to 4.4%, respectively. The degradation of quinclorac in paddy water and paddy soil fitted for the first-order chemical kinetic equation C=Coe ^-ht. The half lives of quinclorac were 8.7 and 14.1 days in paddy water and paddy soil respectively in treatment A, and 10.8 days in paddy soil in treatment B.

关 键 词： 二氯喹啉酸 水稻田 消解动态 液相色谱 串联质谱 半衰期

领　　域： [环境科学与工程]