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磷矿石中氧化铁的分析方法有重铬酸钾容量法、磷酸铁(铝)分离-EDTA容量法和邻菲啉分光光度法3种。笔者从事磷矿石分析多年,用磷酸铁(铝)分离-EDTA容量法测定磷矿石中氧化铁和氧化铝含量时发现,溶液的p H值控制不好,会导致测定结果不准确。对其中的操作步骤进行优化后,能准确地分析氧化铁含量。1实验原理显色配合物的颜色与络合比不同有关。在显色反应过程中,若p H值不同,络合物的络合比会不
Phosphorite in iron oxide analysis methods are potassium dichromate capacity method, iron phosphate (aluminum) separation-EDTA capacity method and phenanthroline spectrophotometry 3 kinds. The author engaged in phosphate rock analysis for many years, with iron phosphate (aluminum) separation-EDTA volumetric method to determine the content of iron oxide and alumina phosphate rock found p H value of the solution is poorly controlled, will result in inaccurate determination. After the operation steps are optimized, the iron oxide content can be accurately analyzed. 1 Experimental Principle The color of the complex is different with the complexation ratio. During the chromogenic reaction, if the p H value is different, the complexing ratio of the complex will not