College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.
Key Laboratory of Ecology and Environment in Minority Areas, Minzu University of China, National Ethnic Affairs Commission, Beijing 100081, China.
Int J Environ Res Public Health. 2023 Feb 16;20(4):3478. doi: 10.3390/ijerph20043478.
The concentrations of polychlorinated biphenyls (PCBs), polychlorinated naphthalenes (PCNs), and polychlorinated dibenzo--dioxins and dibenzofurans (PCDD/Fs) were determined in soil samples collected around an industrial park in Northwest China, to investigate the potential impacts of park emissions on the surrounding environment. The total concentration ranges of PCBs, PCNs, and PCDD/Fs in the soil samples were in 13.2-1240, 141-832, and 3.60-156 pg/g, respectively. The spatial distribution and congener patterns of PCBs, PCNs, and PCCD/Fs indicated that there might be multiple contamination sources in the study area, so source apportionments of PCBs, PCNs, and PCCD/Fs were performed by a positive matrix factorization model based on the concentrations of all target congeners together. The results revealed that these highly chlorinated congeners (CB-209, CN-75, and OCDF) might be derived from phthalocyanine pigments, the legacy of Halowax 1051 and 2,4-D products, which together contributed nearly half of the total concentration of target compounds (44.5%). In addition to highly chlorinated congeners, the local industrial thermal processes were mainly responsible for the contamination of PCBs, PCNs, and PCDD/Fs in the surrounding soil. The total carcinogenic risk of PCBs, PCNs, and PCDD/Fs in a few soil samples (0.22 × 10, 0.32 × 10, and 0.40 × 10) approached the threshold of potential carcinogenic risk (1.0 × 10). Since these pollutants can continuously accumulate in the soil, the contamination of PCBs, PCNs, and PCDD/Fs in surrounding soil deserves continuous attention.
在中国西北地区的一个工业园区周围采集了土壤样本，以调查园区排放物对周围环境的潜在影响，测定了土壤样本中多氯联苯（PCBs）、多氯萘（PCNs）和多氯二苯并对二恶英和二苯并呋喃（PCDD/Fs）的浓度。土壤样本中 PCBs、PCNs 和 PCDD/Fs 的总浓度范围分别为 13.2-1240、141-832 和 3.60-156 pg/g。PCBs、PCNs 和 PCDD/Fs 的空间分布和同系物模式表明，研究区域可能存在多个污染源，因此，基于所有目标同系物的浓度，采用正矩阵因子分解模型对 PCBs、PCNs 和 PCDD/Fs 进行了源分配。结果表明，这些高氯化同系物（CB-209、CN-75 和 OCDF）可能来自酞菁颜料，Halowax 1051 和 2,4-D 产品的遗留物，它们共同贡献了目标化合物总浓度的近一半（44.5%）。除了高氯化同系物外，当地工业热过程是造成周围土壤中 PCBs、PCNs 和 PCDD/Fs 污染的主要原因。少数土壤样本中 PCBs、PCNs 和 PCDD/Fs 的总致癌风险（0.22×10、0.32×10 和 0.40×10）接近潜在致癌风险（1.0×10）的阈值。由于这些污染物会在土壤中不断积累，因此周边土壤中 PCBs、PCNs 和 PCDD/Fs 的污染值得持续关注。
