Distribution and accumulation of heavy metals in carbonate and reducible fractions of marine sediment from offshore mid-western Taiwan |
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| Authors: | Hou-Chun Liu Chen-Feng You Bor-Jiun Huang Chih-An Huh |
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| Institution: | 1. Department of Earth Sciences, National Cheng Kung University, Tainan 70101, Taiwan;2. Earth Dynamic System Research Center, National Cheng Kung University, Tainan 70101, Taiwan;3. Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan |
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| Abstract: | Two marine sediment cores from offshore mid-western Taiwan were subsampled and pre-treated using a sequential extraction procedure to separate carbonate and reducible fractions. Aliquots of these extracts were analyzed to determine their chemical composition to evaluate the geochemical processes responsible for heavy metal distribution and accumulation in the coastal environment. Our data demonstrate that sedimentation rates derived from excess 210Pb associated with metal fluxes show large increases circa A.D. 1990. A well-synchronized increase in metal flux in both geochemical fractions was found and validated by Pearson’s correlation. Principal component analysis revealed the heavy metal fluxes to be highly correlated with the sediment deposition rate, with metal contamination potentially driven by a sole contributor. This study emphasizes the changes in sedimentation rate is potentially caused by activities associated with the inland economic development during this time, rather than by raising heavy metal pollution dominated the accumulation offshore mid-western Taiwan. |
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| Keywords: | Heavy metals Marine sediment Sequential extraction |
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