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羟基乙叉二膦酸(HEDP)是一种络合剂,它可以用作水质稳定剂、电镀工业中的金属络合剂、洗涤剂中的助洗剂等。纯HEDP的标准溶液尚可作滴定剂以测定钍。工业级HEDP浓度的测定,目前一般均沿用钼兰比色法,以总磷量减去杂质正磷酸和亚磷酸中的磷量,再通过间接换算求出工业级HEDP的浓度。本法系采用络合滴定法直接测定试样中HEDP的含量,方法简单、快速、准确。
Hydroxyethylidene diphosphonic acid (HEDP) is a complexing agent, which can be used as water stabilizer, metal complexing agent in electroplating industry, detergent builder and so on. Pure HEDP standard solution is still titrant to determine thorium. The determination of industrial HEDP concentration, the current generally follow the molybdenum blue colorimetric method, the amount of total phosphorus minus the amount of phosphorus in orthophosphoric acid and phosphorous acid, and then obtained by indirect conversion of industrial-grade HEDP concentration. This method uses the complexation titration method to directly determine the content of HEDP in the sample. The method is simple, rapid and accurate.