摘要
对水样蒸发浓缩法用于地面水中低浓度ＣＯＤ的测定进行探讨的实验结果表明，地面水中低浓度ＣＯＤ物质可以在碱性条件下，通过蒸发浓缩处理后，采用重铬酸钾法进行测定，所得结果的精密度和准确度良好．若选择水样浓缩系数为５，则可将重铬酸钾法的最低检测限浓度降低到１０ｍｇ·Ｌ－１，从而使该方法能够适用于地面水水质标准中各类水质ＣＯＤ的监测要求．
This paper was about the tests of the evaporation CODcr method for determining of COD in surface water. The results of evaporation tests showed that the low concentration reduced substances in surface waters can be concentrated quantitativly under the basic conditions, and the precision and accuracy of evaproating CODcr method was good. If the concentration coefficient of samples was selected by 5, the detection limit of COD was reduced from 50 mg·L -1 to 10 mg·L -1 . This method may be a good way for improving the accuracy of deterimining of low concentration COD in surface waters.
