高盐废水中化学需氧量测定方法的研究

Research on the Determination of COD_(Cr)in High Salinity Wastewater

针对高盐废水中氯离子对CODCr测定的干扰问题,对比了密闭消解–硫酸亚铁铵滴定法对高盐标样和实际样品中CODCr的测定效果。实验表明,对于氯离子质量浓度小于800 mg/L的高盐废水样品,采用该法密闭消解30 min,硫酸亚铁铵滴定结果准确度高、精密度好,测定结果的相对误差小于5.0%,相对标准偏差不大于1.29%。相对于国标法,该法耗能低、对环境污染小、耗时短,适用于高盐废水CODCr的测定。

Regarding the interference of the chlorine in high salinity wastewater on the determination of CODcr, the method of sealed digestion-ammonium ferrous sulfate was reasearched. The result showed that for the high salinity wasterwater samples of Cl-less than 800 mg / L, the method of closed vessel digesting 30 min, and then the ammonium ferrous sulfate titration, had high accuracy and precision and the relative error was less than 5.0%, the relative standard deviation was not more than 1.29%. Relation to the method of national standard, this method had the advantages of low en- ergy consumption, less pollution to environmental and short of time-consuming, which was suitable for the measurement of CODcr in the high salinity wastewater.