Abstract:

The effect of nickel ions on COD determination by spectrophotometry has been studied based on the determination of absorption curves of Cr³⁺、Cr₂O₇^2-and Ni²⁺,and the COD of standard water samples.The results show that nickel ions have no effect on COD determination,if the concentration of nickel ions is less than 100 mg/L in the water sample.If the concentration of nickel ions is more than 100 mg/L,the COD of the water samples should be determined after the samples have been diluted.

Key words: chemical oxygen demand, spectrophotometry, nickel ions

摘要：

通过测定Cr³⁺、Cr₂O₇^2-和Ni²⁺的吸收曲线及标准水样的COD,研究了Ni²⁺对分光光度法测定COD的影响。结果表明,当水样中Ni²⁺质量浓度>100mg/L时,对测定结果无明显影响;若水样中Ni²⁺质量浓度<100mg/L时,应将水样稀释后再进行测定。

关键词: 化学需氧量, 分光光度法, 镍离子

CLC Number: 

• O657.32