Phan Nam Long, Nguyen Thi Ngoc Anh, Bui The Vinh, Can Thu Van, Nguyen Thu Thao, Huynh Thi Thu Thuy

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Groundwater quality is vulnerable to various processes. In this study, processes affecting groundwater quality were evaluated in coastal aquifers of Quang Nam - Da Nang (QNDN). A chemical data of 426 groundwater samples from 27 monitoring wells in the period 2011-2018 were analyzed. Principal Components Analysis (PCA) and Base Exchange Indices (BEXD) were applied for the evaluation. The PCA results suggested the influences of natural processes and anthropogenic activities on the groundwater quality. Seawater influence contributed to the dominant ions in groundwater; mineral weathering and dissolution mainly increased the alkalinity, Ca2+, and Mg2+; SO42- reduction explained the low SO42- in the groundwater; and reductive dissolution of Fe (hydroxides) caused Fe exceeding WHO’s drinking standard. Intensive groundwater abstraction generated up coning of saline groundwater; discharge from agricultural practices, industrialization, and urbanization were considered as sources of high NO3- in groundwater. The integration of monitoring data and BEXD gave a better interpretation of salinization and freshening, which can be masked by the memory effects of seawater transgression and regression in history.


Keywords: Groundwater quality, natural processes, anthropogenic activities, memory effects.


[1] S. Venkatramanan, S. Chung, S. Y. Selvam, S. Lee, S. Y. Elzain, Factors Controlling Groundwater Quality in the Yeonjegu District of Busan City, Korea, using the Hydrogeochemical Processes and Fuzzy GIS, Environmental Science and Pollution Research, Vol. 24, No. 30, 2017, pp. 23679-23693.
[2] K. Kim, N. Rajmohan, H. J. Kim, S. H. Kim, G. S. Hwang, S. T. Yun, B. Gu, M. J. Cho, S. H. Lee, Evaluation of Geochemical Processes Affecting Groundwater Chemistry Based on Mass Balance Approach: A Case Study in Namwon, Korea, Geochemical Journal, Vol. 39, No. 4, 2005, pp. 357-369.
[3] K. Kim, H. J. Kim, B. Y. Choi, S. H. Kim, K. H. Park, E. Park, D. C. Koh, S. T. Yun, Fe and Mn Levels Regulated by Agricultural Activities in Alluvial Groundwaters Underneath a Flooded Paddy Field, Applied Geochemistry, Vol. 23,
No. 1, 2008, pp. 44-57.
[4] H. Guo, D. Zhang, D. Wen, Y. Wu, P. Ni, Y. Jiang, Q. Guo, F. Li, H. Zheng, Y. Zhou, Arsenic Mobilization in Aquifers of the Southwest Songnen Basin, PR China: Evidences from Chemical and Isotopic Characteristics, Science of the Total Environment, Vol. 490, 2014, pp. 590-602.
[5] A. Carraro, P. Fabbri, A. Giaretta, L. Peruzzo, F. Tateo, F. Tellini, Effects of Redox Conditions on the Control of Arsenic Mobility in Shallow Alluvial Aquifers on the Venetian Plain (Italy), Science of the Total Environment, Vol. 532, 2015, pp. 581-594.
[6] K. Aradhi, K. M. Satyanarayanan, P. K. Govil, Assessment of Heavy Metal Pollution in Water Using Multivariate Statistical Techniques in an Industrial Area: A Case Study from Patancheru, Medak District, Andhra Pradesh, India, Journal of Hazardous Materials, Vol. 167, No. 1-3, 2009, pp. 366-373.
[7] A. K. Dwivedi, P. S. Vankar, R. S. Sahu, Geochemical Trends of Heavy Metal in Aquifer System of Kanpur Industrial Zone, Uttar Pradesh (India): A Case Study, Environmental Earth Sciences, Vol. 73, No. 11, pp. 2015,
pp. 7287-7296.
[8] Q. Zhang, J. Sun, J. Liu, G. Huang, C. Lu, Y. Zhang, Driving Mechanism and Sources of Groundwater Nitrate Contamination in the Rapidly Urbanized Region of South China, Journal of Contaminant Hydrology, Vol. 182, 2015, pp. 221-230.
[9] G. Huang, C. Liu, J. Sun, M. Zhang, J. Jing, L. Li, A Regional Scale Investigation on Factors Controlling the Groundwater Chemistry of Various Aquifers in a Rapidly Urbanized Area: A Case Study of the Pearl River Delta, Science of the Total Environment, Vol. 625, 2018, pp. 510-518.
[10] H. Amano, K. Nakagawa, R. Berndtsson, Groundwater Geochemistry of a Nitrate-Contaminated Agricultural Site, Environmental Earth Sciences, Vol. 75, No. 15, 2016, pp. 1145.
[11] Y. Du, Y. Deng, T. Ma, S. Shen, Z. Lu, Y. Gan, Spatial Variability of Nitrate and Ammonium in Pleistocene Aquifer of Central Yangtze River Basin. Groundwater, Vol. 58, No. 1, 2020, pp. 110-118.
[12] W. E. Federation, A. P. H Association, Standard Methods for the Examination of Water and Wastewater. American Public Health Association (APHA): Washington, DC, USA, 2005.
[13] P. J. Stuyfzand, Base Exchange Indices as Indicators of Salinization or Freshening of (Coastal) Aquifers, in 20th Salt Water Intrusion Meeting, Naples, Florida, USA, 2008,
[14] J. P. Riley, G. Skirrow, Eds. Chemical Oceanography. Acad. Press, London & NY, 1975.
[15] H. Q. Khai, C. S. Hyun, P. N. Long, K. Kim, N. V. Ky, K. K. Seok, Occurrence of Metal-rich Acidic Groundwaters Around the Mekong Delta (Vietnam): A Phenomenon Linked to Well Installation, Science of the Total Environment, Vol. 654, 2019, pp. 1100-1109.