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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 22, 2006
Accepted February 12, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Characterization of aquatic groundwater colloids by a laser-induced breakdown detection and ICP-MS combined with an asymmetric flow field-flow fractionation

Min-Hoon Baik^† Jong-Il Yun¹ Muriel Bouby² Pil-Soo Hahn Jae-Il Kim²

Department of Radwaste Disposal Research, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea ¹Dept. of Nuclear & Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 371-1 Guseong-dong, Yuseong-gu, Daejeon 373-1, Korea ²Institut f"ur Nukleare Entsorgung, Forschungszentrum Karlsruhe GmbH, P.O. Box 3640, D-76021 Karlsruhe, Germany

mhbaik@kaeri.re.kr

Korean Journal of Chemical Engineering, September 2007, 24(5), 723-729(7), 10.1007/s11814-007-0033-7

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Abstract

This study investigated the characteristics of natural groundwater colloids by a laser-induced breakdown detection (LIBD) and inductively-coupled plasma mass spectrometry (ICP-MS) in a combination with an asymmetrical flow field-flow fractionation (AsymFFFF). The groundwater was sampled from a borehole in the Yuseong area of Daejeon, Korea at different geological depths from 30 to 460 m and its geochemical parameters were measured. The combination of AsymFFFF and LIBD revealed a heterogeneous size fraction with a relatively broad size distribution of the groundwater colloids. One of the size fractions of the groundwater colloids was about 20 nm up to smaller than 100 nm, and the other fractions were larger than 100 nm. The elemental composition of the groundwater colloids was also analyzed by the AsymFFFF coupled with an ICP-MS. Results from the ICP-MS coupled with the AsymFFFF provided us with information about the size-specific elemental composition. The smaller sized fractions mainly consisted of calcite colloids with strontium, whereas the larger fractions were comprised of colloids such as aluminosilicates and iron oxides. The observations of all the groundwater samples indicate a similar pattern for the colloid fractions in size and in element composition except in the concentration.

Keywords

Groundwater Colloids Laser-induced Breakdown Detection (LIBD) Asymmetric Flow Field-Flow Fractionation (AysmFFFF) Inductively-Coupled Plasma Mass Spectrometry (ICP-MS)

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