引言目前,重铬酸钾法仍是测定高含量铁的常用经典分析方法。但氯化高汞、六价铬盐都是剧毒试剂,严重污染环境。而以二甲酚橙或磺基水杨酸为指示剂,EDTA络合滴定,虽可避免使用有毒试剂,但只能适用小于30mg铁的测定,否则铁本身的颜色干扰终点观察。也有提出用DCTA络合测定铁,但仍不适用于高含量铁的测定。 Introduction At present, the potassium dichromate method is still the most commonly used classical analytical method for the determination of high iron content. However, high chloride chloride, hexavalent chromium salts are highly toxic reagents, serious pollution of the environment. The xylenol orange or sulfosalicylic acid as an indicator, EDTA complex titration, although can avoid the use of toxic reagents, but only for less than 30mg iron determination, or iron itself color interference end point observation. It has also been proposed to use DCTA complexation determination of iron, but still not suitable for the determination of high iron content.