【摘要】 采用微波消解技术处理堆肥样品,优化了样品前处理条件和仪器分析条件,建立了微波消解-氢化物发生-原子荧光光谱法测定堆肥中的Hg和As的分析方法。结果表明,该方法在最佳条件下,Hg、As的检出限分别为0.001 2、0.018μg.L-1,校准曲线的相关系数r均大于0.999。样品中待测元素的回收率在(100±8)%范围以内,RSD均小于2%,说明该方法具有简便、快速、灵敏、准确等特点,适合于堆肥样品的测定。通过堆肥产品和堆肥原料中的对比实验发现,堆肥后Hg、As的损失率小于7%,说明堆肥处理对重金属Hg、As的总量减少意义不大。更多还原

【Abstract】 The method of microwave digestion-sequential injection hydride generation-atomic fluorescence spectrometry was proposed for determining mercury(Hg) and arsenic(As) in compost by means of optimizing pre-processing and instrumental performance.The digestion temperature and volume of reagent,flow chart of digestion of compost were determined.20 min pre-processing of a sample reduced the release volume of poisonous gas.The pre-processing method of sample had characteristic of low pollution,briefness and rapidity.Disturbing effect of HNO3 was eliminated with 1% ascorbic acid in the course of testing sample.Used Ar as carrier gas and sheath gas,the flow rate was respectively 400 and 800 mL·min-1,the carrier liquid was 0.12 mol·L-1 HCl,the reducer was KHB4(its content was respectively 0.01% and 1% for testing Hg and As).The detection limit of Hg and As was 0.001 2 μg·L-1 and 0.018 μg·L-1 respectively under optimal conditions.The correlation coefficient of standard curve was more than 0.999.The recovery of Hg and As was(100±8)%,with RSD below 2%.The testing method was sensitive and accurate.The loss ratio of Hg and As was below 7% after composting,indicating that the composting had little effect on Hg and As decreasing.更多还原