氢化物发生-原子荧光光谱法测定农产品中硒、锑元素

采用微波消解法消解农产品样品，以硫脲和抗坏血酸作为预还原剂，利用氢化物发生-原子荧光光谱法同时测定农产品中痕量元素硒、锑的含量。通过实验优化选择仪器的工作条件，考察了样品酸度、载流酸度、硼氢化钾用量等因素对荧光强度的影响以及干扰的消除情况。结果表明，硒、锑的最低检出限分别为0．9ug／kg、0．4μg／kg，标准曲线在0～25．0μg／L之间呈线性关系，相关系数〉0．999。对样品平行测定6次，相对标准偏差为2．36％～4．13％，加标回收率为91．6％～95．2％。

Determination of trace Se and Sb in agricultural products by hydrogenate generation-atomic fluorescence spectroscopy

Samples of agricultural products were digested in a microwave oven using thiourea and ascorbic acid as reductants for prereduction,and trace Se and Sb contents were determined by hydrogenate generation-atomic fluorescence spectroscopy. The working conditions of the instrument were optimized. The influences of the acidities of sample solution and carrier solution,and the amount of potassium borohydride on the fluorescence intensity,and the methods for the elimination of interference were studied. The detecti...