摘要
目的建立饮用水中砷、锑的氢化物发生—原子荧光测定方法。方法在盐酸介质中,以硼氢化钠为还原剂,使砷、锑离子生成原子态砷、锑蒸气,由氩气带入原子荧光光谱仪中进行检测。同时还研究了仪器条件、酸度、介质、硼氢化钠浓度等分析条件对测定砷、锑的影响。结果在优化的条件下,砷、锑在0～100μg/L浓度范围内线性关系良好(r>0.9995),检出限为:砷0.0587μg/L、锑0.0529μg/L。分别取2.0、4.0、6.0μg/L3种浓度标准溶液连续测定11次,测定的荧光值统计相对标准偏差,分别为:砷4.4%、1.8%、0.8%,锑4.1%,2.8%,0.9%;加标值为0.8、1.0、2.0μg/L3个等级,回收率为95.0%～105.5%。结论该方法简便,快速,检出限低,重现性好,结果准确可靠,适用于饮用水中砷、锑的同时测定。
[ Objective ] To establish the determination method of arsenic and antimony in drinking water by hydride generation atomic fluorescence speetrophotometry. [ Methods ] In the medium of hydrochloric acid, sodium borohydride was adopted as reductant, which caused the ion-state arsenic and antimonium changing into atomic-state arsenic and antimonium steam. The steam was carried into the instrument of atomic fluorescence spectroscopy by argon gas to test. The influencing factors such as instrument condition, aceseenee, medium, the concentration of sodium borohydride, and others which might affect the determination of arsenic and antimoni- urn were analyzed. [ Results ] Under optimized condition, the linear relation was fine as the concentration of arsenic and antimonium ranged from 0 - 100μg/L （ r =0.9995）. The detection limit of arsenic and antimonium was 0. 0587μg/L and 0.0529μg/L respectively. The standard solution （ 2.0, 4.0, 6.0 μg/L） were used to test the relative standard deviation of the methods, for continuous 11 times ; the relative standard deviations were 4.4%, 1.8 %, and 0.8 % for arsenic, and 4.1%. 2.8% and 0.9% for antimoniurn. The recovery rates were from 95.0% -105.5% when the standard addiction walue of 0.8, 1.0, and 2.0μl g/L. [ Conclusion ] This method is simple, fast, with low detection limit and good reproducibility as well as accurate and reliable results, and applicable for simultaneous determination of arsenic and antimonium in drinking water.
出处
《职业与健康》
CAS
2009年第23期2518-2519,共2页
Occupation and Health
关键词
饮用水
砷
锑
原子荧光
Drinking water
Arsenic
Antimonium
Atomic fluorescence
