Kim Hekap, Kim Dong-Jin, Koo Jin-Hoi, Park Jeong-Gue, Jang Yong-Chul
Department of Environmental Science, College of Natural Sciences, Kangwon National University, Hyoja 2-dong, Chuncheon, Gangwon-do 200-701, South Korea.
Sci Total Environ. 2007 Mar 15;374(2-3):273-81. doi: 10.1016/j.scitotenv.2006.12.047. Epub 2007 Feb 12.
Chromated copper arsenate (CCA) is currently the most commonly used wood preservative in Korea. Questions, however, have been raised regarding the potential environmental impacts of metal leaching from CCA-treated wood to soil. Although a number of researchers from other countries have reported that chromium, copper, and arsenic do leach from CCA-treated wood over time, to date few field studies have been performed on those metals in soils adjacent to CCA-treated wood structures in Korea. The present study was conducted to determine the lateral and vertical distributions and accumulation of chromium, copper, and arsenic in soils collected from CCA-treated wood structures. A total of fifty-five composite soil samples were collected from four CCA-treated wood structures of approximately one year in age. The samples were analyzed for physicochemical properties as well as for the total chromium, copper, and arsenic concentrations. The chromium, copper, and arsenic concentrations in soil samples adjacent to the structures were as high as 79.0, 98.9, and 128 mg/kg, respectively, compared to background soil samples (48.2, 26.9, and 6.27 mg/kg, respectively). Arsenic was more mobile in soil than chromium and copper. The concentration gradient of arsenic in soil was observed only to the depth of approximately 5 cm in one year of outdoor exposure, whereas chromium and copper apparently remained near the surface (approximately less than 1 cm) after their release. Future efforts should be made to observe seasonal impacts on the release of metals and incorporate metal speciation into determining more detailed mobility and distribution.
铬酸铜砷（CCA）是韩国目前最常用的木材防腐剂。然而，人们对CCA处理过的木材中金属向土壤的潜在环境影响提出了质疑。尽管其他国家的一些研究人员报告称，随着时间的推移，铬、铜和砷确实会从CCA处理过的木材中沥出，但迄今为止，韩国针对与CCA处理过的木结构相邻土壤中的这些金属进行的实地研究很少。本研究旨在确定从CCA处理过的木结构采集的土壤中铬、铜和砷的横向和垂直分布及积累情况。从四个使用约一年的CCA处理过的木结构中总共采集了55个复合土壤样本。对样本的理化性质以及总铬、铜和砷浓度进行了分析。与背景土壤样本（分别为48.2、26.9和6.27 mg/kg）相比，与木结构相邻的土壤样本中铬、铜和砷的浓度分别高达79.0、98.9和128 mg/kg。砷在土壤中的流动性比铬和铜更强。在一年的户外暴露中，仅在约5厘米深度处观察到土壤中砷的浓度梯度，而铬和铜释放后显然仍留在地表附近（约小于1厘米）。未来应努力观察季节对金属释放的影响，并将金属形态纳入以确定更详细的迁移性和分布情况。
