酸度对氢化物发生-原子荧光光谱法测定砷镉汞铅硒的影响  

EFFECT OF ACIDITY ON THE HG-AFS DETERMINATION OF ARSENIC,CADMIUM,LEAD,MERCURY AND SELENIUM

作　　者：李明容[1] 邢增涛[1] 尚晓冬[2] 门殿英[1] 

机构地区：[1]上海市农业科学院农产品质量标准与检测技术研究所 [2]上海农业科学院食用菌研究所,上海201106

出　　处：《理化检验（化学分册）》2006年第11期939-940,942,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：上海市科技兴农重点攻关项目"农业工厂化生产及技术标准体系"(编号:沪农科攻字第8-3号)。

摘　　要：对用氢化物发生-原子荧光光谱法测定砷、镉、铅、汞、硒五元素时,溶液酸度对相关元素荧光强度的影响进行了试验,并提出了测定各元素时的最佳条件,所述酸度实际是指原子化前试液的综合酸度。试验结果表明,测定铅的溶液酸最严格,应控制在cHNO30．20～0．22 mol·L-1之间,与此相比,测定镉的酸度范围较宽,可允许在cHCl 0．20～0．31 mol·L-1范围内。而对砷、硒、汞的测定,酸度的影响最小,依次在cHCl>0．1 mol·L-1,cHCl>0．12 mol·L-1及cHNO3>0．16 mol·L-1的酸度条件下均能获得满意结果。The effect of acidity of sample solution introduced into the atomizer after addition of the mixed solution containing KBH4 in the HG-AFS determination of As, Cd, Pb, Hg and Se were studied, and optimized conditions for their determinations were given. It was shown that the acidity of the solution was most critical for determination of lead, which should be controlled in a narrow range of CHND3 0. 20-0. 22 mol ·L^-1. For the determination of cadmium, broader range of acidity between CHCl 0. 20-0. 31 mol ·L^-1 were tolerable. While for the determination of arsenic, selenium and mercury, the fluoresence intensity were very slightly effected by the acidity of test solution, and satisfactory results were obtained under the acidity of CHCl〉0. 1 mol ·L^-1 （for As）, CHCl〉0. 12 mol ·L^-1 （for Se） and CHNO3〉0. 16 mol ·L^-1 （for Hg）.

关 键 词：氢化物发生-原子荧光光谱法 砷 镉 汞 铅 硒 酸度 

分 类 号：O657.31[理学—分析化学]