三种快速测定水中化学耗氧量方法的比较

目的：比较比色法，微波消解法与标准回流法在测定各种水样中化学耗氧量（COD）时的优缺点。方法：利用比色法，微波消解法与标准回流法对各种实际样品进行测定。结果：对各种实际样品测定中比色法，微波消解法与标准回流法的相对标准偏差范围分别为4．3％－9．59％，3．58％－5．61％及4．03－4．27％，样品加标回收率分别在90％－95％，90％－96％及90％－98％，结论：微波消解法具有简单、快速和准确等特点，在未来的环境样品监测中具有广阔的应用前景。

Comparison of 3 Methods for Determination of Chemical Oxygen Demand of Water

ve To compare the advantage and disadvantages of spectrophotometry assay, microwave di-gestion and standard circumfluence method for determination of chemical oxygen demand (COD) in various water samples. Methods The levels of COD of the water samples were determined by spectro-photometry, microwave di-gestion and standard circumfluence method respectively. Results The relative standard variations were 4.3% ~ 9.59% for spectrophotometry, 3.58% ~5.61% for microwave digestion method and 4.03% ~ 4.27% for standard circumfluence method. The recovery rates of adding standard material were 90% -95% , 90% ~96% and 90% ~98% respectively. Conclusion The microwave digestion method showed easy, rapid and accurate. It presented good practical prospect in monitoring environmental samples.