溴酸钾滴定法测定金属砷中砷含量的改进

Analysis Improvement of Arsenic Content in Metal Arsenic by Potassium Bromate Titration Method

采用溴酸钾滴定法对金属砷中砷含量进行测定,试样用浓硫酸加热分解完全后,加水煮沸,趁热加入硝酸、尿素,甲基橙作为指示剂,用溴酸钾标准溶液滴定至溶液呈无色为终点,由消耗的溴酸钾标准溶液体积计算出砷量,减去相当于试样中锑量的砷量后得到净砷量。该分析方法简单、快速,结果精准可靠。

Potassium bromate titration method is used to determine the arsenic content in metal arsenic.After the sample is completely decomposed with concentrated sulfuric acid,water is added to boil,nitric acid,urea,and methyl orange as indicators are added while it is hot,the solution with potassium bromate standard solution is titrated until the solution is colorless as the end point,the arsenic content is calculated from the volume of consumed potassium bromate standard solution,and the net arsenic content is obtained after deducting the amount of arsenic equivalent to the amount of antimony in the sample.The analytical method is simple,fast,and the results are accurate and reliable.