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微量铁的光度测定,应用较多的是1,10-二氮菲和磺基水杨酸法。近年来对表面活性剂存在下铁的光度测定进行了一系列研究,如 CAS-Zeph 法,茜素紫-CPB 法,CAS-CTAC 法,8-羟基喹啉-Zeph 法和硫氰酸盐-Zeph 萃取光度法等。最近林谦次郎等研究了硫氰酸盐-TritonX-100光度法测定铁的条件,并用于水中微量铁的测定。本文在此基础上对显色条件作了进一步研究,并提出了消除铜(Ⅱ)、钛(Ⅳ)、钴(Ⅱ)干扰的简便方法,用于非铁基合金和非金属材料中铁的测定,操作简便,稳定,选择性良好,灵敏度为1,10-二氮菲法的1.73倍。主要试剂铁标准溶液:100μg ml~(-1),用保证纯硫酸铁铵[FeNH_4(SO_4)_2·12H_2O]按常法配成0.1N 硫酸溶液。并用重铬酸钾容量法检查其真实浓度。使用时将此液
Photometric determination of trace iron, the application is more 1,10-phenanthroline and sulfosalicylic acid method. In recent years, a series of studies have been conducted on the photometric determination of iron in the presence of surfactants such as the CAS-Zeph method, alizarin violet-CPB method, CAS-CTAC method, 8-hydroxyquinoline-Zeph method and thiocyanate- Zeph extraction spectrophotometry. Recently Lin Qian Jiro et al studied thiocyanate -TritonX-100 spectrophotometric determination of iron conditions, and for the determination of trace amounts of iron in water. Based on this, the conditions of color development are further studied. A simple method to eliminate the interference of copper (Ⅱ), titanium (Ⅳ) and cobalt (Ⅱ) is proposed for the determination of iron in non-ferrous alloys and nonmetallic materials , Easy to operate, stable, good selectivity, sensitivity 1.73 times the 1,10-phenanthroline method. The main reagent iron standard solution: 100μg ml -1, with pure iron ammonium sulfate [FeNH_4 (SO_4) _2 · 12H_2O] 0.1N sulfuric acid solution was dubbed as usual. And check the true concentration with potassium dichromate capacity method. Use this solution when used