Distribution characteristics of chemicals and heavy metals in typical karst subterranean rivers in South China
- Permanent Link:
- Distribution characteristics of chemicals and heavy metals in typical karst subterranean rivers in South China
- Series Title:
- Carbonates and Evaporites
- Liu, Shuyi
- Publication Date:
- Subjects / Keywords:
- Karst ( local )
Subterranean Rivers ( local )
South China ( local )
Heavy Metals ( local )
Chemicals ( local )
- serial ( sobekcm )
- The goal of this study is to understand the impact of human activities on the characteristics of chemicals and heavy metals in typical karst subterranean rivers in South China and the patterns of their changes. Thus, the Jila, subterranean river in Liuzhou, the Lihu subterranean river in Nandan and the Maocun village subterranean river in Guilin in karst regions in Guangxi Province and the Banzhai subterranean river in Maolan in a karst region in Guizhou Province were selected for analysis. These four rivers are typical subterranean rivers and are affected by human activities to different extents. During Octoberâ€“December 2015 (dry season), we performed on-site investigations and collected water samples. The results show the following: (1) Ca2+ and HCO3âˆ’ are significantly correlated with the heavy metals Cr and Ni in the four subterranean rivers (p < 0.01); this relationship is mainly attributed to rock weathering from dissolution but is caused mostly by human activities. (2) The detected concentrations of K+, Na+, NH4+, Clâˆ’and SO42âˆ’ are significantly correlated with the detected concentrations of NO3âˆ’ in the four subterranean rivers (p < 0.01); domestic sewage, pesticides and fertilizer are the main sources. (3) The dilution from precipitation results in decreases in the ion concentrations, but the NO3âˆ’ and SO42âˆ’ concentrations following dilution from precipitation are still high, suggesting that domestic sewage and the application of fertilizer continuously impact the subterranean rivers. (4) Conductivity is an important index that reflects the status of land usage and water quality; the conductivity levels increase with anthropogenic disturbances. (5) The comparison of previously published ion concentrations in the Jila subterranean river in Liuzhou with those measured in this study shows that pollution has decreased substantially, which is closely related to urban planning and enhanced environmental consciousness in this region. The above results and conclusions can provide a scientific basis for the optimal m
- Original Version:
- Carbonates and Evaporites, Vol. 34, no. 4 (2019-11-06).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
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- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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