萃取催化光度法同时测定铁和铜  

Simultaneous Determination of Iron and Copper by Extraction-Catalytic Spectrophotometry

作　　者：孙登明[1] 周维领 

机构地区：[1]淮北煤炭师范学院化学系,淮北235000

出　　处：《分析化学》2001年第11期1329-1331,共3页Chinese Journal of Analytical Chemistry

基　　金：安徽省高等学校自然科学基金资助课题 (No .99JL0 180 )

摘　　要：研究了在pH 5 .5的弱酸性介质中 ,利用Fe 、Cu 对H2 O2 氧化邻氨基酚催化反应速率不同 ,用萃取平衡控制反应时间、水相中邻氨基酚的浓度和反应进行的程度 ,通过测量 42 4nm下有机相的吸光度 ,建立了萃取催化光度法同时测定铁和铜的新方法。其线性范围分别为 0 .0 0 10～ 0 .0 30mg L和0 0 10～ 0 .15mg L。用于水、大豆和人发中铁和铜的测定 。A new extraction-catalytic spectrophotometric method for the simultaneous determination of iron and copper has been studied. The method is based on the difference of the reaction rate of Fe(III) and Cu(II) catalyzed oxidation of o-aminophenol by hydrogen peroxide in weak acidic medium at pH 5.5. The reaction time, concentration of o-aminophenol in aqueous phase and degree of reaction are controlled by extraction equilibrium. The absorbance of organic phase is measured at 424 nm. The linear range of the method are 0.001 similar to 0.30 mg/L (for iron) and 0.01 similar to 0.15 mg/L (for copper). The method has been applied to the simultaneous determination of iron and copper in water, soybean and human hair with satisfactory results.

关 键 词：萃取催化光度法 铁 铜 邻氨基酚 同时测定 水 大豆 人发 

分 类 号：O657.3[理学—分析化学]