HR: 1330h
AN: H13A-09    [Abstracts]
TI: Arsenic Species Distribution in a Hydrologic System Near a Skarn Deposit
AU: * Kim, Y
EM: yountaekim@hotmail.com
AF: Dept. Earth System Science, Yonsei Univ., 134 Sinchon-dong, Seodaemun-gu, Seoul, 120749 Korea, Republic of
AU: Woo, N
EM: ncwoo@ysgeo.yonsei.ac.kr
AF: Dept. Earth System Science, Yonsei Univ., 134 Sinchon-dong, Seodaemun-gu, Seoul, 120749 Korea, Republic of
AU: Choi, I
EM: norkorea@hanmail.net
AF: Dept. Earth System Science, Yonsei Univ., 134 Sinchon-dong, Seodaemun-gu, Seoul, 120749 Korea, Republic of
AU: Yoon, C
EM: chyoon@kbsi.re.kr
AF: Korea Basic Science Institute, 126-16 Anam-dong, Seongbuk-gu, Seoul, 136701 Korea, Republic of
AU: Yoon, H
EM: dunee@kbsi.re.kr
AF: Korea Basic Science Institute, 126-16 Anam-dong, Seongbuk-gu, Seoul, 136701 Korea, Republic of
AU: Shin, M
EM: popo482@kbsi.re.kr
AF: Korea Basic Science Institute, 126-16 Anam-dong, Seongbuk-gu, Seoul, 136701 Korea, Republic of
AB: The purpose of this study is to understand the distribution of arsenic species in the hydrologic system and to compare sampling and analyzing methods. A well-known and historical iron mine, located in the suburb of Ulsan in Korea, has been identified as the source of environmental problems because of high arsenic contents. This mine formed as a calcareous skarn deposit represented by ore pipe in the boundary between early Tertiary granite and Cretaceous sedimentary rocks, Hayang Group. A total of 18 water samples, including eight groundwater, nine creek-water and a spring water, were collected around the mine. For total arsenic concentrations, samples were filtered then acidified by concentrated HNO₃, and analyzed by HG-ICP-AES. For arsenic species analysis, samples were divided into two sub-samples. One was only filtered and analyzed by LC-ICP-MS within 24 h. The other was filtered then added phosphoric acid, and analyzed by LC-ICP-MS within 72 h. In results of total As analysis, a spring water showed the concentration of 300 ug l^-1, and two groundwater samples around 70 ug l^-1. Only one groundwater sample had an As concentration less than 10 ug l^-1. In the downstream of studied two creeks, As concentrations were 42 and 53 ug l^-1. For arsenic speciation, As(V) was the only present species in groundwater and the major one in surface water. In surface water, As(III) existed in a small fraction except one sample which showed higher As(III) concentration than As(V). And a surface water sample near the spring had As(III), As(V), DMA and unknown peak which showed before As(III), inferred as AsB. Two sub-samples for arsenic speciation showed similar results. Addition of phosphoric acid appeared successfully preserve samples for at least 72 h.
DE: 1094 Instruments and techniques
DE: 1831 Groundwater quality
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2005 Joint Assembly