N_2-苯浮选光度法测定天然水中痕量硒的研究  

Study on the determination of trace selenium in natural water by N_2-benzene flotation spectrophotometry

作　　者：张义民[1] 闫永胜[2] 陆晓华[2] 

机构地区：[1]河南平顶山师范高等专科学校,河南平顶山467000 [2]华中科技大学环境科学与工程学院,湖北武汉430074

出　　处：《冶金分析》2002年第3期13-15,共3页Metallurgical Analysis

基　　金：河南省自然科学基金资助项目 ( 9910 30 2 12 )

摘　　要：用亚硒酸 (H2 SeO3)氧化I- 成I2 ,I2 与I- 生成I- 3 ,I- 3 与孔雀绿阳离子 (MG+ )发生离子缔合反应生成缔合物 ,再用N2气将此缔合物浮选于苯中 ,建立了光度法间接测定硒的新方法。测定了天然水中硒 ,结果表明 :本法灵敏度高 (ε =2 2×10 6 ) ,精密度好 (测 5 0 μg硒 10次 ,RSD =2 7% ) ,检出限为 4 7× 10 - 1 0 g/mL。A new method for the determination of trace selenium by spectrophotometry was developed H 2SeO 3 could oxidize I - to I 2,I 2 then was associated with I - to form I - 3 Negatively charged I - 3 and positively charged malachite green formed an ion pair complex, which could be floated by N 2 into benzene and Se was determined indirectly by spectrophotometry The apparent molar absosptivity (ε) of this method was 2 2×10 6,and RSD was 2 7% The method has a very high sensitivity and a good precision.

关 键 词：N2-苯浮选光度法 天然水 痕量 

分 类 号：O657.3[理学—分析化学]