褐煤风化过程中化学特性的变化

本文测定了６种不同风化程度褐煤的化学性状。结果表明，随着在自然界堆积风化时间的延长，褐煤的总碳，总氮含量及碳氮比都下降，灰分含量则增大，可提取的腐植酸及黄腐酸量明显增大，且紫外吸光值呈系统变化，尤其是黄腐酸中聚乙烯吡咯烷酮树脂可吸附部分（黄腐酸中腐植部分）随风化加深而降低，各种不同风化程度褐煤中腐植酸的红外吸收光谱变化不是很明显，且与土壤腐植吸收光谱相似。

STUDY ON CHANGES OF CHEMICAL PROPERTIES OF LIGNITE WITH WEATHERING

Changes of chemical properties of lignites collected from Qiantun coal mine.Liao ning province with four years of weathering have been studied. With weathering, the content of total carbon and nitrogen,and C/N ratio were decreased .while the ash content and the amount of organic matter were increased distinctly. UV-visible spectra of humic and fulvic acids obtained from lignite samples were changed systematically with weathering. Distribution of fulvic acids adsorbed on cross-linked polyvinylpyrrolidone (PVP)(which was regarded as humic substance) was also changed. However, the IR spectra of the humic acids in lignite samples from recently excavated and weathered one have scarcely differences.