硫酸汞用量对化学需氧量测定的影响

Effect of the amount of mercury sulfate on the determination of chemical oxygen demand

本文对硫酸汞的使用量与化学需氧量测定关系进行探讨,针对化学需氧量的测定过程中,硫酸汞的使用量对氯离子的掩蔽效果进行探讨。设计试验对测量高低浓度下的邻苯二甲酸氢钾溶液中的化学需氧量过程中,使用硫酸汞与氯离子质量比分别为10:1、20:1以及30:1的检测结果进行探讨。发现对化学需氧量为500mg/L,氯离子浓度为(6000-10000)mg/L的水样进行检测时,硫酸汞与氯离子质量比为30:1时的掩蔽效果较为理想。

In this paper,the relationship between the amount of mercury sulfate and the determination of chemical oxygen demand is discussed,and the masking effect of the amount of mercury sulfate on chlorine ion in the process of determination of chemical oxygen demand is discussed.In the process of measuring the chemical oxygen demand in potassium hydrogen phthalate solution at high and low concentrations,the determination results of the mass ratio of mercury sulfate to chlorine ion of 10: 1 to 20: 1 and 30:1,respectively,were discussed in the design experiment.It was found that when water samples with a chemical oxygen demand of 500mg / L and chloride concentration of (6000-10000) mg/L were detected,the mass ratio of mercury sulfate to chlorine ion was 30:1.The effect is ideal.