正交实验优化的氢化物发生原子荧光法测定水中痕量锑

采用盐酸为介质，以顺序注射-氢化物发生原子荧光法测定生产用水中的锑含量．通过正交实验确定了仪器工作参数，研究了介质浓度、KBH4浓度、硫脲一抗坏血酸加入量等因素对测定结果的影响，探讨了共存离子的干扰．在选定的最佳实验条件下，方法的检出限为0．011ng/mL，线性范围0～8ng／mL，相对标准偏差为2．78％～6．20％，加标回收率为91．0％～99．1％．该方法操作简便，灵敏度高，准确度好，与微波消解法相比较，两者无显著性差异．

Determination of Trace Antimony in Water by HydrideGeneration Atomic Fluorescence Spectrometry with Optimization by Orthogonal Experiments

Using HCl as the medium, the determination of antimony in production water by sequence injection - hydride generation atomic fluorescence spectrometry has been reported. Operating conditions of the instrument were evaluated by orthogonal experiments. Effects of acidity, KBH4 concentration, and thiourea - aseorbic acid content, etc. on measurement results were studied. The effect of coexistent elements was also investigated. Under optimum conditions, the detection limit was 0.011 ng/mL with a linear range of 0 ～ 8 ng/mL. The relative standard deviation was 2.78% ～ 6.20%, the recovery rate was 91.0% ～ 99. 1%. The method is simple, sensitive and accurate. No significant difference appears between this method and the microwave digestion method.