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建立了超高效液相色谱-质谱联用检测五氟磺草胺在水稻植株、稻田土壤、田水和糙米中残留的分析方法,结合田间试验研究了五氟磺草胺在稻田环境中的消解及残留特性,并对稻米中五氟磺草胺残留的膳食暴露进行了初步评估。结果表明:在0.005~0.5 mg/L范围内,五氟磺草胺的质量浓度与对应的峰面积间呈良好线性关系,检出限(LOD)为0.001~0.002 mg/kg,定量限(LOQ)为0.003~0.005 mg/kg。在0.005~0.5 mg/kg添加水平下,五氟磺草胺在水稻植株、稻田土壤、田水和糙米中的平均回收率在89%~106%之间,相对标准偏差在2.8%~8.5%之间。浙江、福建和黑龙江2年3地的田间试验表明:0.025%五氟磺草胺颗粒剂在水稻植株、稻田土壤和田水中的消解半衰期分别为1.5~3.3,3.0~4.7和1.6-3.0 d,说明该药剂在稻田环境中消解速率较快。以五氟磺草胺有效成分含量37.5和56.3 g/hm~2分别施药1次,于水稻成熟期采样检测,发现其在糙米中的残留量低于0.005 mg/kg,表明其膳食摄入风险很低,该研究结果可为五氟磺草胺风险评估提供一定参考。
A method was developed for the determination of penoxsulam in paddy field, paddy soil, field water and brown rice by ultra performance liquid chromatography-mass spectrometry (GC-MS / MS). In combination with field experiments, the dissolution of penoxsulam in paddy field And residue characteristics, and preliminarily evaluated the residual dietary exposure to penoxsulam in rice. The results showed that there was a good linear relationship between the mass concentration of penoxsulam and the corresponding peak area in the range of 0.005-0.5 mg / L, the limit of detection (LOD) was 0.001-0.002 mg / kg, the limit of quantification ) Is 0.003 to 0.005 mg / kg. At the level of 0.005-0.5 mg / kg, the average recoveries of penoxsalam in rice plants, paddy soil, field water and brown rice ranged from 89% to 106% with relative standard deviations between 2.8% and 8.5% between. Field experiments in Zhejiang Province, Fujian Province and Heilongjiang Province in two years showed that the digestion half-lives of 0.025% of Penoxsulam granules in rice plants, paddy soil and field water were 1.5-3.3, 3.0-4.7 and 1.6-3.0 d, respectively The agent in the paddy environment digestion faster. The results showed that the residues in brown rice were less than 0.005 mg / kg when the contents of the active ingredients of penoxsulam were 37.5 and 56.3 g / hm ~ 2, respectively. The results showed that the dietary intake The risk is very low and the results of this study may provide a reference for the risk assessment of penoxsulam.