Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Science, Beijing 100049, China.
Sci Total Environ. 2023 May 1;871:162015. doi: 10.1016/j.scitotenv.2023.162015. Epub 2023 Feb 4.
The agricultural soils in China are suffered from serious polychlorinated biphenyls (PCBs) contamination, however, the valid management standards for farmland are absent to efficiently control the health risks of PCBs exposure. This study analyzed the contamination characteristics and main composition of PCBs in agricultural soils of the southeastern China from the published literature over the past 20 years, and derived the regional generic assessment criteria (GAC) using an exposure modelling approach for individual and total PCBs (∑PCBs) via multiple exposure pathways such as ingestion of soil and dust, consumption of vegetables, dermal contact with soil and dust, ingestion of soil attached to vegetables, and inhalation of soil vapour and soil-derived dust outdoors under the agricultural land scenario. It is identified that the averaged ∑PCBs concentration of 80.03 ng g under the 95 % lower confidence limit with an unacceptable health risk of 4.8 × 10 has significantly exceeded the integrated generic assessment criteria (expressed as GAC) of 16.5 ng g. Accordingly, the exposure pathways from the consumption of agricultural produces and indirect ingestion of soil attached to vegetables contributed up to 62 %-88 % of the total exposure, followed by 11 %-33 % of the soil ingestion and 2 %-6 % of dermal contact. The derived GAC for ∑PCBs is extremely valuable to effectively assess and manage the PCBs contamination in agricultural soils of China.
中国农田土壤受到严重多氯联苯（PCBs）污染，但缺乏有效的农田管理标准来有效控制 PCBs 暴露的健康风险。本研究分析了过去 20 年中国东南部农田土壤中 PCBs 的污染特征和主要成分，并采用暴露模型方法，通过多种暴露途径（如摄入土壤和灰尘、食用蔬菜、皮肤接触土壤和灰尘、食用附着在蔬菜上的土壤以及在农田场景下户外吸入土壤蒸气和土壤衍生的灰尘），为个体和总 PCBs（∑PCBs）推导了区域通用评估标准（GAC）。结果表明，在 95%置信下限下，∑PCBs 的平均值为 80.03ng/g，不可接受的健康风险为 4.8×10，明显超过了 16.5ng/g 的综合通用评估标准（表示为 GAC）。因此，食用农产品和间接摄入附着在蔬菜上的土壤所带来的暴露途径占总暴露量的 62%-88%，其次是 11%-33%的土壤摄入和 2%-6%的皮肤接触。∑PCBs 的推导 GAC 对于有效评估和管理中国农田土壤中的 PCBs 污染非常有价值。
