School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310000, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Environ Pollut. 2022 Jan 15;293:118456. doi: 10.1016/j.envpol.2021.118456. Epub 2021 Nov 2.
Chlorinated paraffins (CPs) are used as additives in metal processing in the metal smelting industry. Data on CPs in the environment near metal smelting plants are limited. The objectives of this study were to investigate the concentrations and congener profiles of CPs in soil around factories in a non-ferrous metal recycling park located in Hebei, China, and to investigate human exposure to CPs in the soil. The concentrations of short-chain CPs (SCCPs) and medium-chain CPs (MCCPs) were determined by two-dimensional gas chromatography with electron capture negative ionization mass spectrometry. The SCCP and MCCP concentrations in the soil samples were 121-5159 ng/g and 47-6079 ng/g, respectively. Generally, the CP concentrations in soils around the factories were relatively high compared with those near other contaminated sites and in rural and urban areas. There were significant correlations between the MCCP concentrations, some SCCP carbon homologs, and the total organic carbon content (p < 0.05). The major SCCP and MCCP congener groups were CCl and C-Cl, respectively. Hierarchical cluster analysis and principal component analysis indicated that SCCPs and MCCPs in the soil might originate from extreme pressure additives containing CP-42 and CP-52 and CP-containing waste material from the factories. The concentrations in two samples collected near a metal recycling factory posed a moderate risk according to a risk assessment conducted using risk quotients. Further risk assessment showed that the CPs concentrations in soil did not pose significant health risks to either children or adults.
短链氯化石蜡（SCCPs）和中链氯化石蜡（MCCPs）是金属冶炼行业金属加工过程中的添加剂。有关金属冶炼厂附近环境中短链氯化石蜡的数据有限。本研究的目的是调查中国河北省一个有色金属回收园区工厂周围土壤中短链氯化石蜡和中链氯化石蜡的浓度和同系物分布，并调查土壤中人类对短链氯化石蜡的暴露情况。采用二维气相色谱-电子捕获负电离质谱法测定了土壤中短链氯化石蜡和中链氯化石蜡的浓度。土壤样品中短链氯化石蜡和中链氯化石蜡的浓度分别为 121-5159 ng/g 和 47-6079 ng/g。一般来说，与其他污染地点以及农村和城市地区相比，工厂周围土壤中的短链氯化石蜡和中链氯化石蜡浓度相对较高。工厂周围土壤中 MCCP 浓度与某些 SCCP 碳同系物和总有机碳含量之间存在显著相关性（p<0.05）。主要的短链氯化石蜡和中链氯化石蜡同系物分别为 CCl 和 C-Cl。层次聚类分析和主成分分析表明，土壤中的 SCCPs 和 MCCPs 可能来自含有 CP-42 和 CP-52 的极压添加剂以及工厂中含 CP 的废物。根据风险商数进行的风险评估表明，两个金属回收厂附近土壤样本的浓度构成中度风险。进一步的风险评估表明，土壤中短链氯化石蜡的浓度对儿童和成人均未构成显著健康风险。
