活性有机质测定方法比较及灰漠土碳调控指标

Comparison between the Chemical Analytical Methods of Labile Organic Matter

对化学氧化法测定活性有机质的测定方法进行比较 ,结果表明 :KMnO4氧化法和K2 Cr2 O7氧化法测定的活性有机质与有机质总量的相关性均较好。但K2 Cr2 O7氧化法存在着终点不易掌握、操作较繁琐等缺点 ;KMnO4氧化法有测定结果相对较稳定、重复性较好、操作简便等优点 ,是一种较好的测定方法。建议采用KMnO4氧化法 :KMnO4的浓度为 333mmol,室温 2 5℃ ,振荡 1h ,5 6 5nm分光光度计比色。将能够被 333mmolKMnO4氧化的有机质称作活性有机质 ,不能被氧化的称作非活性有机质 ,计算出有机质调控指标 (CMI) 。

To compare the analytical of table organic matter by chemical oxidation methods,the results indicated:The relationship between labile organic and total organic matter shows well on KMnO 4 oxidation methods and K 2Cr 2O 7 oxidation methods. But there are some shortcomings at the end of chemical analysis of K 2Cr 2O 7 chemical oxidation,it is difficult to be controled and it is overelaborating analytical work. There are some advantages on the KMnO 4 oxidation methods, which is more stable and to replicate analytical result and easy to work. It is a good method of analysis. We recommend to use the KMnO 4 oxidation method: the consistency of KMnO 4 is 333 mmol, the temperature is 25 ℃ in the room, the tine of oscillation is one hour, the colorimetric wavelength of spectrophotometer is 565 nm.The organic matter oxidized by the 333 mmol KMnO 4 is call labile organic,the matter that cannot be oxidized is called non labile organic, Therefore control guideline of organic is figured out.