正交实验优化的氢化物发生原子荧光法测定水中痕量锑

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

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．

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.