Geochemical characteristics of the mud volcano fluids in southwestern Taiwan and their possible linkage to elevated arsenic concentration in Chianan plain groundwater |
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| Authors: | Chia-Chuan Liu Jyoti Prakash Maity Jiin-Shuh Jean A H M Selim Reza Zhaohui Li Bibhash Nath Ming-Kuo Lee Kao-Hung Lin and Prosun Bhattacharya |
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| Institution: | (1) Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan, 70101, Taiwan;(2) Department of Geosciences, University of Wisconsin–Parkside, Kenosha, WI 53144, USA;(3) School of Geosciences, University of Sydney, Sydney, NSW, 2006, Australia;(4) Department of Geology and Geography, Auburn University, 210 Petrie Hall, Auburn, AL 36849, USA;(5) Sustainable Environmental Research Center, National Cheng Kung University, Tainan, 70101, Taiwan;(6) KTH-International Groundwater Arsenic Research Group, Department of Land and Water Resource Engineering, Royal Institute of Technology, Stockholm, Sweden; |
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| Abstract: | Fluid and mud samples were collected from Wushanting (WST), Hsiaokunshui (HKS), Yenshuikeng (YSK), Kuantzeling (KZL), and
Kunshuiping (KSP) mud volcanoes of southwestern Taiwan. Concentrations of major ions and trace elements in mud volcanic fluids
were analyzed to find the possible linkage to elevated arsenic (As) concentrations in the Chianan plain groundwater. The elevated
Na+, K+, and Cl− concentrations indicated possible marine origin of the fluids. The trace element concentrations in the mud volcanic fluids
were generally low, but the As concentrations were up to 0.12 mg/L. High contents of As, Fe, and Mn were observed in the mud
samples. Saturation index calculations indicated that both carbonate and oxide minerals acted as potential sinks for As in
the mud volcanic fluids. Arsenic in the dewatering fluids and muds may be transported by the subsurface flow and surface streams
as suspended solids and eventually deposited in the Chianan plain aquifers. Under reducing conditions, As may be released
from the host minerals (such as Fe- and Mn-oxides/hydroxides), thereby causing widespread groundwater As pollution. |
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