洛克沙胂在青菜及土壤中的残留特性

The Characteristics of Roxarsone Residue in Chinese Cabbage and Soil

通过盆栽试验,利用原子荧光和高效液相色谱法研究了洛克沙胂在青菜及土壤中的残留特性。结果表明,青菜对洛克沙胂有明显的吸收累积现象,在试验期内植株中砷浓度均高于国家规定的蔬菜中砷限量(0.5mg·kg-1)。洛克沙胂在土壤中的消除可按指数模型拟合,相关系数大于0.9,平均半衰期为(20.87±2.16)d。至60d时,除20mg·kg-1剂量组外,各处理组土中的洛克沙胂含量为6.42～22.86mg·kg-1。

The pot cultivation experiment, integrated with automic fluorescence analysis ＆ high performance liquid chromatography methods, was developed for exploring the residual property of roxarsone in Chinese cabbage and soil in which the vegetable was planted. The experimental soil was treated by roxarsone at 0, 20, 50, 80, 150 mg·kg^-1 concentration. The As content in Chinese cabbage at different growth dates was analysed by automic fluorometry whereas the roxarsone concentration in soil it was measured by HPLC method.The results showed that the absorption and accumulation to roxarsone was obviously found in pakchoi cabbage seedling when it was planted in roxarsone treated soil. The contents of arsenic in the plants druing the whole experimental time were higher than the arsenic permitted limit level （0.5 mg·kg^-1） of vegetables in China. The degradation laws of roxarsone in soil were coincide with exponential equation which the correlation coefficients were more than 0.9 and average half-life was （20.87±2.16）d. The concentrations of roxarsone in soil treated were high in the concentration of 6.42-22.86 mg·kg^-1 at the 60th day except the group of 20 mg·kg^-1 roxarsone. Roxarsone, a main organoarsenic residue in animal manure, was then foculized on its safety to soil fertilizer and the arsenic content of vegetable planted in because of the clear absorption and accumulation in Chinese cabbage and slow degradation in soil.