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Characteristics of Groundwater, Sewage Water and Stream Water Contamination Based on VOCs Concentration Around Ulsan, Korea  

Cho, Byong-Wook (Korea Institute of Geoscience and Mineral Resources)
Yun, Uk (Korea Institute of Geoscience and Mineral Resources)
Im, Hyun-Chul (Korea Institute of Geoscience and Mineral Resources)
Sung, Ig-Hwan (Korea Institute of Geoscience and Mineral Resources)
Jang, Woo-Seog (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.38, no.1, 2005 , pp. 57-65 More about this Journal
Abstract
To investigate the characteristics of the volatile organic compounds (VOCs) concentration in the groundwater around Ulsan, Korea, 168 groundwaters, 12 stream waters, and 6 sewage waters were analyzed for 61 VOCs. Results showed that VOCs were not detected in stream waters and total VOCs concentration in 5 sewage waters was in the range of ND-22.3 ${\mu}$g/L. In 78 groundwater samples more than one VOCs were detected and VOCs concentration of the samples ranged from 0.1 ${\mu}$g/L to 387.1 ${\mu}$g/L. However, VOCs concentration of 66 samples out of 78 samples showed less than 10 ${\mu}$g/L and that of only 6 samples exceeded Korea drinking water limit (KDWL). 42 VOCs detected from the 168 groundwaters were 14 aromatic hydrocarbons out of 25, 27 chlorinated aliphatic hydrocarbons out of 35, and methyl tert-butyl ether (MTBE). Detection rate of each VOCs in the groundwaters was as follows: chloroform in 43 samples (25.6%), methylene chloride in 36 samples (21.4%), TCE in 26 samples (15.5%), 1,1-dichloroethane in 19 samples (1.3%), PCE in 16 samples (9.5%), cis-1,2-DCE in 15 samples (8.9%), and toluene in 14 samples (8.3%). Even though VOCs concentration in the groundwaters of the study area is still low, the city is expanding and the drinking water limit is becoming strict, and therefore continuous monitoring is necessary.
Keywords
groundwater; VOCs; sewage water; contamination;
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