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Open AccessArticle

Leaching Behavior of As, Pb, Ni, Fe, and Mn from Subsurface Marine and Nonmarine Depositional Environment in Central Kanto Plain, Japan

1
Department of Civil and Environmental Engineering, Saitama University, Saitama 338-8570, Japan
2
Environmental Geotechnology Group, Center for Environmental Science in Saitama, Saitama 347-0115, Japan
3
Department of Civil and Environmental Engineering, Saitama University, Saitama 338-8570, Japan
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(10), 435; https://doi.org/10.3390/geosciences9100435
Received: 11 September 2019 / Revised: 2 October 2019 / Accepted: 3 October 2019 / Published: 8 October 2019
(This article belongs to the Special Issue Marine Sediments and Marine Environments)
The leaching behavior of arsenic (As), lead (Pb), nickel (Ni), iron (Fe), and manganese (Mn) was investigated from subsurface core sediment of marine and nonmarine depositional environments in central Kanto Plain, Japan. A four-step sequential extraction technique was adopted to determine the chemical speciation, potential mobility, and bioavailability of metals under natural conditions in variable depositional environments. In addition, a correlation of these properties with pore water and total metal content was carried out. The concentration of As in pore water was found to be 2–3 times higher than the permissible limit (10 µg/L) for drinking water and leachate in fluvial, transitional, and marine environments. The trend of potential mobile fractions of As, Pb, and Ni showed Fe–Mn oxide bound > carbonate bound > ion exchangeable bound > water soluble in the fluvial environment. However, in the marine environment, it showed Fe–Mn oxide bound > water soluble > carbonate bound > ion exchangeable bound for As. The leaching of As in this fluvial environment is due to the organic matter-mediated, reductive dissolution of Fe–Mn oxide bound, where Mn is the scavenger. The amount of total content of As and sulfur (S) in transitional sediment reflects an elevated level of leachate in pore water, which is controlled by S reduction. However, the leaching of As in marine sediment is controlled by pH and organic matter content. View Full-Text
Keywords: marine and nonmarine sediments; hazardous trace metal; leaching behavior; sequential extraction marine and nonmarine sediments; hazardous trace metal; leaching behavior; sequential extraction
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Hossain, S.; Ishiyama, T.; Hachinohe, S.; Oguchi, C.T. Leaching Behavior of As, Pb, Ni, Fe, and Mn from Subsurface Marine and Nonmarine Depositional Environment in Central Kanto Plain, Japan. Geosciences 2019, 9, 435.

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