FeⅡ-5-Br-PADAP-微乳液析相液-液萃取光度法测定铁的研究  

Study on phase-separation spectrophotometric determination of ironⅡ by liquid-liquid extraction with FeⅡ-5-Br-PADAP-microemulsion system

作　　者：余萍[1] 高俊杰[1] 张东[1] 高飞[1] 

机构地区：[1]沈阳理工大学环境与化工学院,辽宁沈阳110168

出　　处：《冶金分析》2005年第2期21-23,共3页Metallurgical Analysis

摘　　要：研究了铁-[2 (5 Br 2 吡啶偶氮) 5 二乙氨基酚](5 Br PADAP)-微乳液体系析相光度分析法。研究中发现,在72℃水浴中加热5min,微乳液(OP乳化剂/正丁醇/正庚烷/水)相即与水相完全分层,且位于水相之上,可直接移取测定。Fe(Ⅱ)在0～0 32μg/mL范围内符合比尔定律,表观摩尔吸光系数为3 09×105,方法具有很好的选择性,是一种简便,快速的富集分离和分析方法,应用于环境水样中铁的测定,结果令人满意。Microemulsion was applied to phase-separation spectrophotometry for determination of iron*'. OP microemulsion(OP/C_4H_9OH/C_7H_(16)/water)was used as extractant and the phase-separation system of Fe*'-2--5-diethylaminophenol(5-Br-PADAP)-OP microemulsion was studied.The result shows that the OP microemulsion phase can be separated from water solution completely with bathing for 5 min at 72 ℃ and can be directly used for spectrophotometric analysis because it's on the water phase.Beer's law is obeyed in the range of 0-0.32 μg/mL for Fe*'.The apparent molar absorptivity is (3.09×10~5 L· mol^(-1))·cm^(-1) at 744 nm.The proposed method is possible to be a high sensibility and selectivity for determination of Fe*' in pond water and tap water with simplicity,rapidity and accuracy.

关 键 词：光度法测定 液-液萃取 表观摩尔吸光系数 光度分析法 微乳液体系 二乙氨基酚 OP乳化剂 Fe(Ⅱ) 吡啶偶氮 铁(Ⅱ) 比尔定律 富集分离 环境水样 正庚烷 正丁醇 水相 

分 类 号：TG115.33[金属学及工艺—物理冶金]