测定高氯废水COD_(cr)的方法探讨——硫酸汞添加法

Study on the Determination of COD_(cr) With HgSO_4-Addition Method in Producing Wastewater with High Chlorine

化学需氧量是评价水体中有机物污染的重要指标,通常采用CODcr来表示。在其测定过程中氯离子是影响结果准确性的重要因素。由于氯离子的干扰,高氯废水中化学需氧量测定误差较大,尤其对于高氯低化学需氧量的水样,其干扰更为严重。本文对高氯废水化学需氧量的测定方法以及原理进行了阐述,针对不同范围的化学需氧量,对应采用高浓度重铬酸钾氧化法、低浓度重铬酸钾氧化法来测定,最终确定了一种最直接、简便、准确的方法-硫酸汞添加法来测定高氯废水的CODcr。

Ghemical oxygen demand （ CODcr ） is an important index to evaluate the organic pollution in water. Chlorine ion in aqueoussolution sample is the important interfering factor that can affect the accuracy of the determinative result. The COD measurement error is often large in high chlorine waste water because chlorine ion disturbs in the measurement especially in the case of low - COD water sample. The mechanism of COD, in producing wastewater with high chlorine was introduced and a direct, simple and accurate method of CODe, determination was proposed in this paper.