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锰铁中锰量的快速测定,常用过硫酸铵-银盐法及硝酸铵法,笔者对络量法进行了探讨。锰铁中除含铁、碳、硅、锰、磷、硫等元素外,所含的铝、镍、铬、铜、钙、钛、镁等元素均为痕量,作为快速分析可不予考虑。故以三乙醇胺掩蔽铁(Ⅲ)离子后,在盐酸羟胺存在下将溶液酸度调至pH10即可以EGTA标准溶液滴定。EGTA不与铁、铝、钛、铬、镁(lgK_稳仅为5.2)等元素络合,故可避免它们的干扰。指示剂的选择是本法的关键,曾先后试验过锌试剂、铬黑T、百里酚酞络合剂、酸性铬蓝K-荼酚绿B
The rapid determination of manganese in ferromanganese, commonly used ammonium persulfate - silver salt method and ammonium nitrate method, the author of the volume method was discussed. Ferromanganese in addition to iron, carbon, silicon, manganese, phosphorus, sulfur and other elements contained in the aluminum, nickel, chromium, copper, calcium, titanium, magnesium and other elements are trace, as a quick analysis can not be considered. Therefore, triethanolamine masking iron (III) ions, the presence of hydroxylamine hydrochloride in the presence of the solution pH was adjusted to pH10 EGTA standard solution titration. EGTA does not with iron, aluminum, titanium, chromium, magnesium (lgK_ steady only 5.2) and other elements complex, it can avoid their interference. The choice of indicator is the key of this law. It has tested zinc reagent, chrome black T, thymolphthalein complexing agent, acid chrome blue K-Ceflane green B