摘要
以原子荧光光谱法测定地表水中砷、铅、汞、镉、硒、锑等6种易氢化元素为研究对象,探讨优化了溶液介质、硼氢化钾浓度、助剂效果、载流方式等影响因素。结果表明,溶液介质:砷、锑选用10%盐酸;硒选用20%盐酸;汞、镉选用4%盐酸;铅选用9%硝酸。硼氢化钾浓度:砷20 g/L;铅、镉25 g/L;汞10 g/L;硒、锑15 g/L。助剂:砷、锑需要使用抗坏血酸-硫脲预先还原为三价态,镉需要用含钴离子的增敏剂,铅需要铁氰化钾和铅稳定剂,以提高铅、镉的测定灵敏度。试验证实水为载流的进样方式是可行的,不仅消除管路中的记忆效益且能够节省大量酸试剂。各元素方法检出限为0.0004~0.0314μg/L,相对标准偏差在1.27%~2.03%。通过水质质控样品和实际样品验证,方法适合地表水中砷、铅、汞、镉、硒、锑的测定。
Six hydrogenable elements, including arsenic, lead, mercury, cadmium, selenium and antimony in surface water are determined by atomic fluorescence spectrometry as the research object. The factors affecting solution medium, potassium borohydride concentration, additive effect and current carrying mode are discussed and optimized in this paper. The various reagents and concentrations selected are as follows. For solution medium, arsenic and antimony use 10% hydrochloric acid, selenium uses 20%hydrochloric acid, mercury and cadmium use 4% hydrochloric acid, and lead uses 9% nitric acid. For the potassium borohydride solution configuration, 20 g/L arsenic, 25 g/L lead and cadmium, 10 g/L mercury and 15 g/L selenium, antimony are added. For the preparation of additives, arsenic and antimony need to be reduced to trivalent state with ascorbic acid thiourea in advance, cadmium needs to be sensitized with cobalt ion, and lead needs potassium ferricyanide and lead stabilizer to improve the determination sensitivity of lead and cadmium. The experiment proved that the injection method with water as the current carrier was feasible, which can not only eliminate the memory benefit in the pipeline but also save a lot of acid reagents. The detection limit of each element method is in the range of 0.0004μg/L to 0.0314μg/L and the relative standard deviation is from 1.27% to 2.03%. The method is proved to be suitable for the determination of arsenic, lead, mercury, cadmium, selenium and antimony in surface water by quality control samples and actual samples..
作者
龚书浩
贺攀红
GONG Shuhao;HE Panhong(Henan Nuclear Technology Application Center,Zhengzhou 450044,China)
出处
《河南水利与南水北调》
2022年第9期101-103,共3页
Henan Water Resources & South-to-North Water Diversion
关键词
原子荧光法
地表水
易氢化元素
影响因素
atomic fluorescence spectrometry
surface water
hydrogenable element
influence factor
作者简介
龚书浩(1966.7-),女,高级工程师,主要从事环境监测及质量管理工作。
