Abstract
Natural weak acidic groundwater occurs in the unconfined and confined aquifers consisting of Quaternary and Neogene unconsolidated sediments near Beihai in southern Guangxi, China. Under natural conditions the groundwater has low TDS (less than 200 mg L−1) and low concentrations of trace elements (less than 100 µg L−1) with a deceasing tend in contents of the Lanthanides (rare earth elements, less than 1 µg L−1) towards higher atomic number. The groundwater ranges in pH from 3.33 to 7.0 with an average value of 5.12 (even lower than that of local rainwater, 5.88). pH values in the groundwater are a bit higher in rainy seasons than those in dry seasons and do not show significant increasing or decreasing trend with time. The average pH value in groundwater in the confined aquifers is even a bit lower than that in the unconfined aquifer. Comprehensive analyses of the groundwater environment suggest that H+ in the groundwater may be derived from dissociation of H2CO3, release of the absorbed H3O+ in clay layers and the acidity of rainwater. The H2CO3 in the groundwater may be formed by dissolution of CO2 (g). Minerals in the unconsolidated sediment are predominated by quartz with small amount of clay minerals. The sediments undergoing a long-term weathering contain low levels of soluble constitutes. Lack of alkaline substances in the groundwater system is also helpful in the accumulation of acidity of the groundwater.
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Agoubi, B., Kharroubi, A., and Abida, H., 2013. Hydrochemistry of groundwater and its assessment for irrigation purpose in coastal Jeffara Aquifer, southeastern Tunisia. Arabian Journal of Geosciences, 6: 1163–1172.
Bartarya, S. K., 1993. Hydrochemistry and rock weathering in a sub-tropical Lesser Himalayan river basin in Kumaun, India. Journal of Hydrology, 146: 149–174.
Baram, S., Kurtzman, D., Ronen, Z., Peeters, A., and Dahan, O., 2014. Assessing the impact of dairy waste lagoons on groundwater quality using a spatial analysis of vadose zone and groundwater information in coastal phreatic aquifer. Journal of Environmental Management, 132: 135–144.
Chen, C., Lin, M., Shu, B., Jiang, J., Ye, S., and Wu, N., 1990. The equivalent drainage boundary and its determination of the confined aquifer in a coastal region: For the Hetang area of Beihai city. Hydrogeology and Engineering Geology, (4): 2–4 (in Chinese with English abstract).
Choi, J., Hulseapple, S. M., Conklin, M. H., and Harvey, J. W., 1998. Modeling CO2 degassing and pH in a stream-aquifer system. Journal of Hydrology, 209: 297–310.
Edet, A. E., 2004. A preliminary assessment of the concentrations of rare earth elements in an acidic fresh groundwater (south-eastern Nigeria). Applied Earth Science, 113: B100–B109.
Giménez, E., and Morell, L., 1997. Hydrogeochemical analysis of salinization processes in the coastal aquifer of Oropesa (Castellón, Spain). Environmental Geology, 29: 118–131.
Herbert, R. B., 1996. Metal retention by iron oxide precipitation from acidic ground water in Dalarna, Sweden. Applied Geochemistry, 11: 229–235.
Isa, N. M., Aris, A. Z., and Sulaiman, W., 2012. Extent and severity of groundwater contamination based on hydrochemistry mechanism of sandy tropical coastal aquifer. Science of the total Environment, 438: 414–425.
Keith, D. C., Runnells, D. D., Esposito, K. J., Chermak, J. A., Levy, D. B., Hannula, S. R., Watts, M., and Hall, L., 2001. Geochemical models of the impact of acidic groundwater and evaporative sulfate salts on Boulder Creek at Iron Mountain, California. Applied Geochemistry, 16: 947–961
Lång, L. O., and Swedberg, S., 1990. Occurrence of acidic groundwater in Precambrian crystalline bedrock aquifers, southwestern Sweden. Water, Air, and Soil Pollution, 49: 315–328
Lawrence, A. K., Gooddy, A. K., Kanatharana, P., Meesilp, W., and Ramnarong, V., 2000. Groundwater evolution beneath Hat Yai, a rapidly developing city in Thailand. Hydrogeology Journal, 8: 564–575.
Li, X., 1982. SiO2 in groundwater. Journal of Huadong College of Geology, (1): 86–92 (in Chinese with English abstract).
Petalas, C. P., and Diamantis, I. B., 1999. Origin and distribution of saline groundwaters in the upper Miocene aquifer system, coastal Rhodope area, northeastern Greece. Hydrogeology Journal, 7: 305–316.
Preda, M., and Cox, M. E., 2000, Sediment-water interaction acidity and other water quality parameters in a subtropicalsetting, Pimpama River, southeast Queensland. Environmental Geology, 39: 319–329.
Preda, M., and Cox, M. E., 2001, Trace metal in acid sediments and waters, Pimpama catchment, southeast Queensland, Australia. Environmental Geology, 40: 755–768.
Qian, H., 2002. Equilibrium Distribution Calculation of Aqueous Species and its Application in Hydrogeology. Xi’an Cartography Publishing House, Xi’an, 24–41 (in Chinese).
Re, V., Sacchi, E., Martin-Bordes, J. L., Aureli, A., Hamouti, N., El, Bouchnan, R., and Zuppi, G. M., 2013. Processes affecting groundwater quality in arid zones: The case of the Bou-Areg coastal aquifer (North Morocco). Applied Geochemistry, 34: 181–198.
Rosen, M., and Jones, S., 1998. Controls on the chemical composition of groundwater from alluvial aquifers in the Wanaka and Wakatipu basins, Central Otago, New Zealand. Hydrogeology Journal, 6: 264–281.
Ryzhenko, B. M., and Cherkasova, E. V., 2012. Chemical composition of natural waters and brines as a result of hydrogeochemical processes in water-rock-gas systems. Geochemistry International, 50 (13): 1101–1150.
Santofimia, E., and López-Pamo, E., 2013. The role of surface water and mine groundwater in the chemical stratification of an acidic pit lake (Iberian Pyrite Belt, Spain). Journal of Hydrology, 490: 21–31.
Sjöström, J., 1993. Ionic composition and mineral equilibriums of acidic groundwater on the west coast of Sweden. Environmental Geology, 21: 219–226.
Stollenwerk, K. G., 1994. Geochemical interactions between constituents in acidic groundwater and alluvium in an aquifer near Globe, Arizona. Applied Geochemistry, 9: 353–369.
Wicks, C. M., and Herman, J. S., 1996. Regional hydrogeochemistry of a modern coastal mixing zone. Water Resources Research, 32: 401–407.
Zhou, X., Chen, M., Ju, X., Wang, J., and Ning, X., 1997. The causes and preliminary ideas of the control countermeasures of sea water intrusion in Beihai City, Guangxi. Chinese Journal of Geological Hazard Control, 8: 77–83 (in Chinese with English abstract).
Zhou, X., Chen, M., Ju, X., Ning, X., and Wang, J., 2000. Numerical simulation of seawater intrusion near Beihai, China. Environmental Geology, 40: 223–233.
Zhou, X., Ruan, C., Yang, Y., Fang, B., and Ou, Y., 2006. Tidal effects of groundwater levels in the coastal aquifers near Beihai, China. Environmental Geology, 51: 517–525.
Zhou, X., Zhang, H., Zhao, L., Shen, Y., Yan, X., Ou, Y., and Huang, X., 2007a. A preliminary analysis of the formation of weak acidic groundwater in Beihai, Guangxi. Acta Geologica Sinica, 81 (6): 850–856 (in Chinese with English abstract).
Zhou, X., Zhang, H., Zhao, L., Shen, Y., Yan, X., Li, R., and Zhang, L., 2007b. Some factors affecting TDS and pH values in groundwater of the Beihai coastal area in southern Guangxi, China. Environmental Geology, 53: 317–323.
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Zhou, X., Shen, Y., Zhang, H. et al. Hydrochemistry of the natural low pH groundwater in the coastal aquifers near Beihai, China. J. Ocean Univ. China 14, 475–483 (2015). https://doi.org/10.1007/s11802-015-2631-z
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DOI: https://doi.org/10.1007/s11802-015-2631-z