摘要：

研究了常压微波消解分光光度法测定COD的方法，讨论了加热时间、硫酸银催化剂的用量、硫酸用量、硫酸磷酸的混酸体积比对微波消解法测定COD的影响。结果表明，微波加热60 s测定COD与国际标准测得COD基本一致，回收率达到96%；硫酸银用量对微波消解法影响不大，可实现无银催化，而硫酸用量不能减少；采用混酸代替硫酸后，V（硫酸）：V（磷酸）=41：时微波消解测定COD效果最佳。

关键词: 化学需氧量, 分光光度法, 常压, 微波消解

Abstract:

The determination of COD by microwave atmospheric digestion is studied. The amount of Ag₂SO₄ catalyst, and mixed acid (H₂SO_4-H₃PO₄)ratio have an effect on the determination of COD bymicrowave atmospheric digestion. The result manifests that the determination value of COD heated in 60 s by microwave digestion coincides with the determination value of that heated in 2 h by international standard. The ratio of recovery is 96%. The amount of Ag₂SO₄ catalyst does not have much influence on the method of microwave digestion. It could be carried out catalyzing without Ag₂SO₄ catalyst. But the amount of H₂SO₄ couldn't be decreased. The ratio of mixed acid (H₂SO₄-H₃PO₄)is 4:1 has an optimumresult about the determination of COD by microwave atmospheric digestion.

Key words: chemical oxygen demand, spectrometry, atmospheric, microwave digestion

中图分类号: 

• TU991.21