淮南矿区煤矸石风化物特性及有机碳分布特征

以淮南矿区潘一矿煤矸石山为研究对象,通过对煤矸石风化物的理化特性、电镜扫描(SEM)、能谱(EDS)和总有机碳(TOC)含量分析,初步研究了煤矸石风化物有机碳分布和释放规律,以及煤矸石山堆积淋溶作用对周边土壤溶解性有机碳(DOC)含量的影响。结果表明,从山顶、山腰到山脚煤矸石风化物中的总有机碳(TOC)含量依次减小,随着采样深度的增加总有机碳(TOC)含量逐渐变大。煤矸石风化物中总有机碳含量与煤矸石风化物粒径大小呈正相关,与煤矸石风化物的风化程度成负相关。不同粒径煤矸石风化物淋滤液中溶解性有机碳(DOC)的含量随着淋溶时间增大而减小,在96h淋滤液中溶解性有机碳含量趋于稳定,且值较为接近。距离山脚2~100m内,随着采样距离的增加土壤中溶解性有机碳含量(DOC)呈减少趋势。在距离煤矸石山80~100m处土壤溶解性有机碳含量接近正常农田土壤含量。

Properties and Organic Carbon Distribution of Weathered Coal Gangue in Huainan Mining Area

Taking coal gangue mountain of Panyi coal mine in Huainan mining area as the study object, through the analysis of physicochemical properties, scanning electron microscope(SEM), energy dispersive spectrometry(EDS), total organic carbon(TOC) contents of weathered coal gangue, the authors preliminarily studied the distribution and release of organic carbon from weathered coal gangue, and the content of dissolved organic carbon(DOC) in soil, which was affected by accumulation and eluviation of coal gangue mountain. The results showed that the contents of TOC in weathered coal gangue decreased from the top of mountain to the mountainside, and to the foot, and with the increasing depth of sampling, the contents became higher. The contents of TOC in weathered coal gangue was positively related with the particle size, and negatively related with the weathering degree of weathered coal gangue. With the increase of time of leaching time, the soluble amounts of DOC leached from weathered coal gangue of different particle size reduced. In the 96 hours leachate, the soluble amounts of DOC tended to be stable, and the values were comparatively similar. Within the distance of 2~100 m to the foot of coal gangue mountain, the increasing distance of sampling, the contents of DOC in soil tended to decrease, and within the distance of 80~100 m to coal gangue mountain, the contents of DOC in soil were similar to that in normal farmland.