氢化物发生–原子荧光法测定水中的镉

Determination of Cadmium in Water by Hydride Generation–Atomic Fluorescence Spectrometry

采用氢化物发生– 原子荧光光谱法对水中的镉进行测定.在0.24 mol/L 盐酸介质中,以1.2 mol/L 钴溶液为信号改进剂、2 g/L 磺基水杨酸钠为基体改进剂,镉与硼氢化钾（质量浓度为25 g/L）反应生成镉的挥发性物质.镉的质量浓度在0～5 μg/L 范围内与荧光强度呈良好的线性,线性相关系数r=0.999 7,方法检出限为0.021 5μg/L,测定结果的相对标准偏差为1.89% （n=7）,加标回收率为88.0%～113.2%.该方法操作简单,灵敏度高,适用于水质中镉元素的测定.

Hydride generation–atomic fluorescence spectrometry was applied to determine cadmium in normal water.Cadmium reacted with potassium borohydride solution （25 g/L） to form cadmium hydride in 0.24 mol/L HCl solution.1.2 mg/L cobalt solution was added to enhance the intensity of fluorescence signal and 2 g/L sulfosalicylic acid sodiumsalt was added as complexing agent. Cadmium mass concentration was linear with fluorescence intensity in the range of 0–5μg/L with the correlation coefficient of 0.999 7. The detection limit was 0.021 5 μg/L, the relative standard deviation ofdetection results was 1.89% （n=7）, and the recoveries ranged from 88.0% to 113.2%. This method is simple,sensitive, andit is suitable for the determination of cadmium in normal water.