杀虫单在甘蔗和土壤中的残留行为和风险评估研究

Residue behavior and risk assessment of monosultap in sugar cane and soil

为了确保杀虫单在甘蔗上的安全科学使用,本研究分别于2015和2016年度在海南和广西开展了9%杀虫单颗粒剂在甘蔗和土壤中的残留消解试验和最终残留试验。残留消解试验结果表明,杀虫单在甘蔗植株中的半衰期为17.3～30.1 d,在土壤中的半衰期为1.7 d;最终残留试验结果表明,杀虫单在甘蔗蔗梢、蔗茎和土壤中的最终残留皆低于LOQ(0.02 mg/kg)。综上,在甘蔗苗期按照3 375 g/hm^2沟施9%杀虫单颗粒剂1次,甘蔗蔗梢和蔗茎中杀虫单的最终残留低于我国的限量标准,对人类的暴露风险较低;而且土壤中杀虫单残留对非靶标生物蚯蚓的环境风险也较低。

To ensure the safety use of monosultap on sugar cane, the residue dynamic and final residue experiments of monosultap 9% GR in sugar cane and soil were conducted in Hainan and Guangxi during 2015 and 2016. The results showed that the half-lives were 17.3-30.1 d and 1.7 d in sugar cane plant and soil, respectively;the final residues in shoots, stalks and soils were all below LOQ (0.02 mg/kg). In conclusion, after furrow application of monosultap 9% GR at 3 375 g/hm 2 for once in sugar cane seedling stage, the final residue of monosultap in sugar cane shoots and stalks satisfied the MRL standard in China and the dietary exposure risk to human was low. Additionally, the environmental risk to earthworm was also low.