银盐沉淀法测定高氯废水COD的方法改进

An improvement of silver salt precipitation method for COD determination of the high chlorine wastewater

对银盐沉淀法进行了方法改进。通常水样中的悬浮物对COD值的测定都有较大的影响,为避免悬浮物的损失而导致COD的测定结果偏低,在使用银盐沉淀法测定高氯废水前,先将水样中的悬浮物进行分离。分别测定悬浮物和滤液的COD,其COD值之和即为高氯废水的COD值。采用改进后的银盐沉淀法测定高氯废水,其结果更加准确可靠。

The silver salt precipitation method was improved. The suspended substance in the water sample has a great influence on the COD value. In order to avoid the low COD result caused by the loss of suspended substance, the suspended substance in the water sample was separated before using silver salt precipitation method to determine the high chlorine wastewater. The COD of suspended substance and the COD of filtrate were determined respectively, and the sum of COD values was the COD value of high chlorine wastewater. The improved silver salt precipitation method for COD determination of high chlorine wastewater is more accurate and reliable.