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| Essential element leaching law of slate under different environmental conditions |
| LI Wangcheng1,2,3, DONG Yaping1*, LI Chen1, WANG Shuangtao1, ZHAO Yan1, WANG Xing1 |
| 1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China; 2. Ningxia Water-saving Irrigation and Water Resources Regulation and Control Engineering Technology Research Center, Yinchuan, Ningxia 750021, China; 3. Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China |
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Abstract Indoor simulation experiments were conducted to study leaching law of essential element from slate under different environmental conditions. The gray-green slate rock samples taken from Xiangshan area were divided into three groups: distilled water dry-wet cycle group, distilled water freeze-thaw cycle group and brackish water freeze-thaw cycle group. The weathering process of slate was simulated through conducting 50 cycle tests on three groups of the samples. Before a test cycle started, the basic physical property constants of the slate were measured, and its microstructure was analyzed with scanning electron microscopy(SEM). During the test, the electrical conductivity(EC)and the essential element composition and content in leaching solution of the slate were measured regularly. Through experiments it is found that the EC values of the leaching solutions of three groups rise with increasing the number of cycles under the existing experimental conditions. The ranking of the number and the kinds of essential elements leached is different from each other in three groups. However, the ranking and the leached content of each elements and the ranking of the number and the types of essential element with more leached content are not different from one group to another. The ranking of three groups is ZLDR, ZLGS, WXDR from the largest to the least in terms of accumulated leached content of essential elements. The accumulated leached content of essential elements is in a logarithmic relationship with the number of test cycles.
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Received: 18 October 2018
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