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核农学报  2013 

14C-哌虫啶光学异构体在土壤中的矿化、结合残留及其在腐殖质中的分布

DOI: 10.11869/hnxb.2013.08.1195, PP. 1195-1202

Keywords: 哌虫啶,光学异构体,结合残留,矿化,腐殖质,杀虫剂

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Abstract:

本文以新烟碱类手性杀虫剂哌虫啶为对象,采用14C同位素示踪法,在光学异构体层面上,研究了哌虫啶4个光学异构体(5R7R-哌虫啶,5S7S-哌虫啶,5S7R-哌虫啶,5R7S-哌虫啶)在不同土壤中的矿化、结合残留及其在腐殖质中的分布规律。结果表明:(1)土壤施药后培养120d,哌虫啶4个光学异构体在3种不同土壤中的矿化量约为引入量的0.40%~11.59%,其中哌虫啶4个光学异构体在碱性滨海盐土(S2)中的矿化量(引入量的5.03%~11.59%)以及哌虫啶光学异构体SR和RS在中性黄松土(S3)中的矿化量(分别为引入量的8.92%和8.84%),达到欧盟有关农药在土壤中的矿化量最小限量要求(>引入量的5%);(2)哌虫啶4个光学异构体在3种不同土壤中的结合残留量约为引入量的14.34%~50.56%,均低于欧盟有关农药在土壤中的结合残留最高限量(胡敏素>胡敏酸的规律。

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