The geochemical characteristics of the mud liquids in the Wushanting and Hsiaokunshui mud volcano region in southern Taiwan: implications of humic substances for binding and mobilization of arsenic

Liu, Chia-Chuan and Maity, Jyoti Prakash and Jean, Jiin-Shuh and Li, Zhaohui and Kar, Sandeep and Sracek, Ondra and Yang, Huai-Jen and Chen, Chien-Yen and Reza, A. H. M. Selim and Bundschuh, Jochen and Lee, Chi-Yu (2013) The geochemical characteristics of the mud liquids in the Wushanting and Hsiaokunshui mud volcano region in southern Taiwan: implications of humic substances for binding and mobilization of arsenic. Journal of Geochemical Exploration , 128. pp. 62-71. ISSN 0375-6742

Abstract

In this study, the geochemical characteristics of mud volcanoes were investigated to seek their possible linkage with arsenic mobilization in the region. Among the mud volcanoes of southern Taiwan, the largest and well-preserved active mud volcanoes are situated in Wushanting (WST) and Hsiaokunshui (HKS). These two selected active mud volcanoes are exhaling mainly methane (CH4>95%) along with other gases like O2, CO2, CO, SO2, H2S, NO, and N2. The content of CH4 in the HKS active mud volcano is very close to that of the WST mud volcano. High Na+ and Cl- concentrations in mud liquids and mudstone deposits indicate their origin in a marine depositional source. However, a newly erupted active mud volcano in WST reflects the presence of a high level of SO4 2-. Significant variations (p≤0.05) in trace and transition element (V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Rb, Sr, Mo, Cd and Ba) concentrations in the liquids and sediments of mud volcanoes are noticed at different eruption periods, suggesting different elemental compositions and release mechanisms in different locations. The weathering of micas as well as clay minerals seems to be responsible for the enrichment in trace metals in mud volcano sediments and fluids. Several trace elements (V, Cr, Mn, Fe, Co, Ni, and Zn) are strongly bound to the sediments, but concentrations of Cu, Se, and Sr are significantly higher in the fluids. The presence of higher As contents in the sediment of HKS was observed in contrast to its fluid. As a reducing agent, humic substances seem to play an important role in binding with trace elements and particularly As in the sediments. Fourier Transform Infrared (FTIR) spectra of humic substances from muds showed the presence of possible functional groups of primary and secondary amines, ureas, urethanes (amide) and silica.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 Elsevier B.V. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 23 Jun 2014 06:37
Last Modified: 15 Sep 2014 00:37
Uncontrolled Keywords: arsenic mobilization; humic substances; mud volcanos; Taiwan
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
04 Earth Sciences > 0402 Geochemistry > 040204 Organic Geochemistry
04 Earth Sciences > 0403 Geology > 040314 Volcanology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970104 Expanding Knowledge in the Earth Sciences
Identification Number or DOI: 10.1016/j.gexplo.2013.01.006
URI: http://eprints.usq.edu.au/id/eprint/25340

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