光电比色法测定水样中的氯化物含量

以硫氰酸汞作为沉淀剂,硫酸铁铵作为显色剂,采用光电计比色,通过水样对光的吸收程度来确定氯化物的浓度,并与硝酸银滴定法进行对比。实验结果表明,水中氯化物在10~300 mg/L时,光电比色法测定氯化物的结果与硝酸银滴定法测定结果较为接近。采用光电计比色测定氯化物的方法快捷、准确且重复性好。

PhotoeIectric coIorimetry for the determination of chIoride content in water sampIes

The concentration of chloride can be determined according to the light absorption degree of the water sample by photoelectric meter for color comparison ,using mercury thiocyanate as precipitant ,and ammonium ferric sulfate as chromogenic agent,and contrasted with silver nitrate titration method. The experimental results indi-cate that when the chloride in water is in the range of 10-300 mg/L ,the result determined by photoelectric colorime-try is close to the result determined by silver nitrate titration. Using photoelectric colorimetry for the determination of chloride content is fast,accurate and reproducible.