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我们以半二甲酚橙为指示剂于低pH下直接络合滴定铁(Ⅲ),克服了采用磺基水杨酸为指示剂,其灵敏度较差和传统的重铬酸钾法使用剧毒的汞盐污染环境,影响人体健康等缺点。本法具有快速、终点明显、灵敏度高、重现性好等优点,适用于日常大批量试样的分析。在冰乙酸介质中,铁(Ⅲ)在溶液中络合时能防止其水解,同时它也是一种极好的缓冲液的性质,经试验确定在36％乙酸介质中,于pH2～2.5的溶液中,加入半
We use semi-xylenol orange as an indicator to complex titrimetric iron (Ⅲ) directly at low pH, which overcomes the problem of using sulfosalicylic acid as an indicator and its sensitivity is poor and the traditional potassium dichromate method uses highly toxic Of mercury salts pollute the environment, affecting human health and other shortcomings. The method has the advantages of fastness, obvious end point, high sensitivity and good reproducibility, and is suitable for the analysis of daily bulk samples. In ferric acetic acid medium, iron (III) prevents its hydrolysis when it is complexed in solution, and it is also an excellent buffer property. It has been determined experimentally that in a 36% acetic acid medium, a solution of pH 2 ~ 2.5 In, add half