微波消解法与回流法测定高悬浮物地表水中COD_(Cr)的方法比较

Comparison of Microwave Digestion and Refluxing Method for Determination of High Suspended Substance in Surface Water COD_(Cr)

化学需氧量(CODCr)反映了水中受还原性物质污染的程度,是评价地表水水质的一个重要指标。对于高悬浮物低浓度CODCr水样的测定,回流法和微波消解法两种方法之间有显著性差异,微波消解法CODCr的值高于回流法。在水样中其他成分不变的情况下,悬浮物的含量越高,CODCr的测定值也随着增高。为了排除悬浮物的干扰,地表水现场采样时,将水样混匀,然后自然沉降30 min,取上层非沉降部分,以更为合理地反映水体受还原性物质污染的程度。

Chemical oxygen demand （CODCr） reflects water pollution degree by reducing substances,which is an important indicator for evaluating surface water quality.Reflux method and microwave digestion method has significant difference for determination of high suspended solids low concentration CODCr water sample.CODCr value increased with suspended substances rising.In order to exclude the interference of suspended substances,surface water sampling on the spot,mixing water,then natural sedimentation 30 min,the upper part non settlement was obtained,so as to more properly reflect water pollution degree by reducing substances.