Chen Xue-Bin, Yang Ping-Heng, Lan Jia-Cheng, Mo Xue, Shi Yang
Huan Jing Ke Xue. 2014 Jan;35(1):123-30.
Chemical dynamics of Qingmuguan karst groundwater system were continuously monitored during the rainfall events. A series of high-resolution concentrations data on trace elements, such as barium, strontium, iron, manganese, aluminum, and other major elements were acquired. Correlation analysis and analysis of concentration curve were employed to identify the sources and migration path of the trace elements. And the formation process of trace elements in groundwater was discussed with the geological background of underground river basin. Research shows that barium and strontium derived from carbonate dissolution appeared to be stored in features such as fissures and pores. These two ions were recharged into the underground river by diffusion during precipitation, which resulted in small changes in the their concentration. However total iron, total manganese and aluminum derived from soil erosion varied relatively widely with strong response to rainfall, attributing to the migration of total iron and aluminum with overland flow to recharge the subterranean river directly via sinkholes while total manganese via soil-rock porous media. The results showed that concentrations of all the five trace elements were below 1 mg x L(-1), and the highest concentrations of total iron, total manganese and aluminum exceeded the limit of drinking water. To some extent, the concentrations of total iron and aluminum may be an indicator for soil erosion and water quality.
在降雨期间，对青木关岩溶地下水系统的化学动力学进行了连续监测。获取了一系列关于钡、锶、铁、锰、铝等微量元素以及其他主要元素的高分辨率浓度数据。采用相关分析和浓度曲线分析来确定微量元素的来源和迁移路径。并结合地下河流域的地质背景探讨了地下水中微量元素的形成过程。研究表明，来自碳酸盐溶解的钡和锶似乎储存在裂隙和孔隙等特征中。这两种离子在降雨期间通过扩散重新补给到地下河中，但它们的浓度变化较小。然而，来自土壤侵蚀的总铁、总锰和铝变化相对较大，对降雨反应强烈，这是因为总铁和铝随着地表径流迁移，通过落水洞直接补给地下河，而总锰则通过土壤 - 岩石多孔介质迁移。结果表明，所有这五种微量元素的浓度均低于1 mg·L⁻¹，总铁最高浓度、总锰和铝超过了饮用水限值。在一定程度上，总铁和铝的浓度可能是土壤侵蚀和水质的一个指标。
