两种测定风化煤与土壤腐殖酸含量方法的比较

Comparison of Two Kinds of Methods on Humic Acids in Weathered Coal and Soils

选择GB11957-2001中的容量法和土壤腐殖质组成测定法,比较二者对风化煤、耕层土壤(石灰性褐土)、矿区土壤(栗钙土)腐殖酸含量的测定结果,及其实验过程、样品用量的不同,并对土壤腐殖质组成测定法中重铬酸钾溶液浓度进行比较选择。结果表明,GB11957-2001中的容量法对风化煤、耕层土壤(石灰性褐土)腐殖酸含量测定结果约为土壤腐殖质组成测定法的4倍,但对于腐殖酸含量较低的矿区土壤(栗钙土),两种方法测定结果相同。相对而言,GB11957-2001中的容量法在实验过程中更易达到实验要求,具有易操作性。通过实验,提出了风化煤、土壤样品分别在两种实验方法中的合理用量,和土壤腐殖质组成测定法中重铬酸钾的合理浓度为0.4000mol/L。

Two kinds of methods are used to measure the content of humic acids in weathered coal, cultivated horizon soil （limy cinnamon soils） and mined soil （castanozems）, they are the volumetric method in the national standard measurement and the humic acids composition measurement. The paper includes comparisons of the content of humic acids in three samples measured mby tWO kinds of methods, the differences in two experiments processes, and the dose of samples. It also compared which concentration is better for K2Cr2O7 in the humic acids composition measurement. The results show that the content of humic acids in the weathered coal and cultivated horizon soil （limy cinnamon soils）, measured by the volumetric method, is about 4 times of the result measured by the humic acids composition measurement, but they get the similar results when the sample is mined soil （castanozems）. Moreover, the volumetric method is easier and more reliable than the humic acids composition measurement when the samples contain more humic acids. The paper has also measured the suitable doses of two samples in different experiments, and 0.4000 mol/L is the suitable concentration of K2Cr2O7 in the humic acids composition measurement.