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本试验以紫外分光光度法对甜菜中稀禾啶残留量进行了测定,并考察了方法的回收率和变异系数.甜菜叶片和根茎样品中的最大回收率分别为86%和82%,变异系数分别为8.1%和9.0%,最低检出限量为0.05ppm。测定看出,稀禾啶在田间降解是非常迅速的,低浓度2小时可降解50%,24小时就可降解至最低检出限量之下:高浓度2小时降解约39%以上,24小时降解达93%以上.无论施药量的高低和采样地点的不同,收获的甜菜作物中稀禾啶残留量是极微的.
In this study, the residues of spironolactone in beet were determined by ultraviolet spectrophotometry, and the recovery rate and coefficient of variation of the method were investigated.The maximum recoveries in sugar beet leaves and rhizome samples were 86% and 82% respectively, the coefficient of variation Respectively 8.1% and 9.0%, the minimum detection limit of 0.05ppm. The results showed that the degradation of spironolactone was very rapid in the field. The degradation rate was 50% at low concentration for 2 hours and then degraded to the lowest detection limit in 24 hours. The high concentration degraded about 39% at 2 hours, and degraded in 24 hours Reaching more than 93% .Whether the amount of pesticide application is different from that of the sampling sites, the residues of spinaedum in the harvested beet crops are minimal.