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Environ Geochem Health. 2019 Feb;41(1):469-480. doi: 10.1007/s10653-018-0099-7. Epub 2018 Mar 24.

Colloid mobilization and heavy metal transport in the sampling of soil solution from Duckum soil in South Korea.

Author information

1
Environmental assessment group, Korea Environment Institute (KEI), Sicheong-daero, Sejong, 30147, Republic of Korea.
2
Korea Natural Resources and Economic Research Institute (KNERI), 701-2 Office, Gindo Bldg, 44, Mapo-daero, Mapo-gu, Seoul, Republic of Korea.
3
Decontamination and Decommissioning Research Division, Korea Atomic Energy Research Institute (KAERI), Daedeok-daero 989-111, Yuseong-gu, Daejeon, 34057, Republic of Korea.
4
Department of Environmental Engineering, Kongju National University, 56 Gongjudaehak-Ro, Gongju, Republic of Korea.
5
School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea. kwkim@gist.ac.kr.
6
Faculty of Environmental Studies, Universiti Putra Malaysia (UPM), 43400, Serdang, Selangor Darul Ehsan, Malaysia. kwkim@gist.ac.kr.

Abstract

Colloid mobilization is a significant process governing colloid-associated transport of heavy metals in subsurface environments. It has been studied for the last three decades to understand this process. However, colloid mobilization and heavy metal transport in soil solutions have rarely been studied using soils in South Korea. We investigated the colloid mobilization in a variety of flow rates during sampling soil solutions in sand columns. The colloid concentrations were increased at low flow rates and in saturated regimes. Colloid concentrations increased 1000-fold higher at pH 9.2 than at pH 7.3 in the absence of 10 mM NaCl solution. In addition, those were fourfold higher in the absence than in the presence of the NaCl solution at pH 9.2. It was suggested that the mobility of colloids should be enhanced in porous media under the basic conditions and the low ionic strength. In real field soils, the concentrations of As, Cr, and Pb in soil solutions increased with the increase in colloid concentrations at initial momentarily changed soil water pressure, whereas the concentrations of Cd, Cu, Fe, Ni, Al, and Co lagged behind the colloid release. Therefore, physicochemical changes and heavy metal characteristics have important implications for colloid-facilitated transport during sampling soil solutions.

KEYWORDS:

Colloid mobilization; Heavy metal; Ionic strength; Soil solution; Subsurface environment; pH

PMID:
29574658
DOI:
10.1007/s10653-018-0099-7

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