土工试验中有机质含量测定方法对比研究

Comparative Study on Determination of the Content of Organic Matter in Soil Test

土中有机质含量多少,将直接影响土的性质,而不同的测试方法其测定结果会有一定差异。有机质测定方法很多,目前采用较多的是重铬酸钾法和灼失量法。为了探求这两种方法的结果差异及对工程分类及评价的影响,本文对两种方法进行对比试验,探讨了两种方法测试结果间的差异,并得出有机质含量测定灼失量法测得结果高于重铬酸钾法,有机质含量低时(Wu<5%),一般高出数倍不等,同时建议有机质含量Wu在15%以下,特别是10%以下时,采用重铬酸钾容量法。

The content of organic matter is affect the quality of the soil, and the test result vary with thetechnique used. There are many methods to test the organic matter content in the soil, at present , thepotassium chromate method and burning loss method are more popular. In order to study the influenceabout the classification and evaluation of project which use different tset result with different methods.This paper introduced two methods, and made a contrast test about a group of soil which have differentorganic matter content, and researched the difference of the result of the two test methods, At the end,the writer gave a advise about how to choice a method of test the organic matter content in the soil. Wearrival at a conclusion that the test result by burning loss method is higher than the potassium chromatemethod. When the content of organic matter is lower, the result is several times higher. And when thecontent of organic matter is lower is lower than 10%,we suggest to use the potassium chromate method.