甲拌磷在甘蔗及土壤中的残留动态分析

Residue Dynamics of Phorate in Sugarcane and Soil

为了对甲拌磷在甘蔗田施用后的环境安全性进行量化评估及制定安全使用标准,采用田间试验方法,研究了5%甲拌磷颗粒剂在土壤中的消解动态,并对其在甘蔗上使用的安全性作出了评价。采用直接测定甲拌磷及其代谢物和用高锰酸钾作为氧化剂两种方法,用气相色谱火焰光度检测器测定了甲拌磷在甘蔗中的最终残留量和土壤中的消解动态及最终残留量。结果表明甲拌磷在土壤中的半衰期为11～12.3d,在正常使用条件下,不会造成甘蔗残毒污染和土壤的残留积累。

In order to evaluate environmental safety and establish safe applied standard, residue dynamics and final residue of phorate granules （5%） in sugarcane and soft were studied using field experimental method. The method for direct determination of phorate and the method for oxidation of phorate and its metabolites with potassium permanganate were developed. The degradation and residue of phorate in sugarcane and soil were determined by gas chromatography with flame photometry detector. The results showed that the half-life of phorate in soil was 11-12.3 d. Finally, phorate would not lead to residue contamination in sugarcane and residue accumulation in soil under normal applying condition.