摘要
研究了新显色剂２－［２－（５－甲基苯并噻唑）偶氮］－５－二乙氨基苯甲酸（５－Ｍｅ－ＢＴＡＥＢ）的离解平衡及与Ｆｅ２＋形成配合物的条件。在十二烷基硫酸钠的存在下，５－Ｍｅ－ＢＴＡＥＢ与Ｆｅ２＋形成稳定的蓝紫色２∶１配合物，其最大吸收波长为６４０ｎｍ，表观摩尔吸光系数为１．０３×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｆｅ２＋的质量浓度在０～４８０μｇ／Ｌ时服从比尔定律。方法用于部级铝合金标样中微量铁的测定，结果与推荐值相符，对ｗ（Ｆｅ）为０．１％～０．５％的样品测定１０次，ＲＳＤ在０．８５％～１．９５％，用于测定矿泉水中ｗ（Ｆｅ）／１０－６铁的测定，ＲＳＤ＜１．５％（ｎ＝７），加标回收率９８．９％～９９．４％
A study on the dissociation equilibrium of new chromatogenic reagent of 2(5methylbenzothiazolyl)azo]5diethylaminobenzoic acid(5MeBTAEB) and its color reaction with Fe2+ is reported in this paper. In the presence of sodium dodecyl sulfonate, Fe2+ reacts with 5MeBTAEB to form a stable 12 blueviolet complex. The maximum absorption of the complex is at 640nm with apparent molar absorptivity is 1.03105 Lmol-1cm-1. Beers law is obeyed in the range of 0480g/L for Fe2+. The proposed method has been applied to the direct determination of trace iron in aluminium alloys standard reference materials and mineral water. The results are in agreement with the certified values and RSD (n=10) are 0.85%1.95%.\=\=
出处
《岩矿测试》
CSCD
北大核心
1999年第3期215-219,共5页
Rock and Mineral Analysis
基金
西安近代化学研究所科研资助
关键词
离解平衡
甲基苯并噻唑
偶氮
二乙氨基苯甲酸
铁
dissociation equilibrium
iron
2thiazolyl)azo]5diethylaminobenzoic acid
spectrophotometry
