In order to investigate chromium contamination of coal mine water, to analyze chromium leaching mechanism and to evaluate environment pollution potential of coal mine water, we perform site investigations, physical an...In order to investigate chromium contamination of coal mine water, to analyze chromium leaching mechanism and to evaluate environment pollution potential of coal mine water, we perform site investigations, physical and computer modeling in the Xuzhou-Datun coal mine district. The result of our test samples shows that chromium concentration was 9 μg/L in roof leachate and 3 μg/L in coal leachate. The host rock has a higher pollution potential than that of coal seams. Leaching experiments and XRD test results indicate that chromium is released from the process of transforming illite to kaolinite. The pH, pe and temperature of coal mine water affect the chromium leaching behavior. Modeling results suggest that the adsorption of adsorbents controls chromium concentration in coal mine water. The chromium adsorption ratio is quite low in both an acid and in an alkaline environment. Therefore, coal mine water has a high pollution potential. Under other conditions, chromium adsorption is stronger in a neutral water environment, so that chromium concentrations may be very low.展开更多
From the perspective of historical geography, Tunxi as the chosen centre for tea production in the Qing could not be explained geographically alone by the river system of Huizhou, in which stead this article attempts ...From the perspective of historical geography, Tunxi as the chosen centre for tea production in the Qing could not be explained geographically alone by the river system of Huizhou, in which stead this article attempts a historicogeographical analysis by shifting our attention towards the sector-specific agglomeration of rel- evant industries and urbanisation. Due to the restrictions by the imperial government on using sea ports （e.g. Shanghai） for the transportation of tea south- wards for sale and export, Tunxi was made the centre for tea trade, not only due to its geographical convenience to tax clearance, but also because of the agglomeration of tea-related industries in the City, such as tin-can, box and bamboo-crate ware- houses. There also had emerged in this process a conglomeration of daily life services, making Tunxi a place of convenience-cure-prosperity. Thus, a combination of both historical and geographical factors can help in no small way to offer a better explanation of the urban development of Tunxi as a tea trade centre in imperial China.展开更多
基金Our study was funded by the National Natural Science Foundation of China (Nos.40572095, 40730422 and 40772102)the Six Projects Sponsoring Talent Summits of Jiangsu Province and the Jiangsu Province Plan of Post-Graduate Student Inno-vation (No.CX07B-050z)
文摘In order to investigate chromium contamination of coal mine water, to analyze chromium leaching mechanism and to evaluate environment pollution potential of coal mine water, we perform site investigations, physical and computer modeling in the Xuzhou-Datun coal mine district. The result of our test samples shows that chromium concentration was 9 μg/L in roof leachate and 3 μg/L in coal leachate. The host rock has a higher pollution potential than that of coal seams. Leaching experiments and XRD test results indicate that chromium is released from the process of transforming illite to kaolinite. The pH, pe and temperature of coal mine water affect the chromium leaching behavior. Modeling results suggest that the adsorption of adsorbents controls chromium concentration in coal mine water. The chromium adsorption ratio is quite low in both an acid and in an alkaline environment. Therefore, coal mine water has a high pollution potential. Under other conditions, chromium adsorption is stronger in a neutral water environment, so that chromium concentrations may be very low.
文摘From the perspective of historical geography, Tunxi as the chosen centre for tea production in the Qing could not be explained geographically alone by the river system of Huizhou, in which stead this article attempts a historicogeographical analysis by shifting our attention towards the sector-specific agglomeration of rel- evant industries and urbanisation. Due to the restrictions by the imperial government on using sea ports （e.g. Shanghai） for the transportation of tea south- wards for sale and export, Tunxi was made the centre for tea trade, not only due to its geographical convenience to tax clearance, but also because of the agglomeration of tea-related industries in the City, such as tin-can, box and bamboo-crate ware- houses. There also had emerged in this process a conglomeration of daily life services, making Tunxi a place of convenience-cure-prosperity. Thus, a combination of both historical and geographical factors can help in no small way to offer a better explanation of the urban development of Tunxi as a tea trade centre in imperial China.
