School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, China.
Land Quality Management Ltd, Nottingham, UK.
Sci Total Environ. 2019 Dec 20;697:134071. doi: 10.1016/j.scitotenv.2019.134071. Epub 2019 Aug 24.
The widespread of agricultural soil pollution in China is posing great risks to food safety and human health. Lack of human health-based generic assessment criteria (GAC) for Chinese agricultural land makes it impossible to efficiently screen and assess the risks unless site-specific risk assessments being carried out, which are both time-consuming and costly. This paper has thus derived the first set human health-based generic assessment criteria (GAC) for 13 substances of concern (including isomers) using the CLEA model for agricultural land scenario in Jiangsu province of China. As there is no authoritative human health risk assessment model in China yet, this paper has determined and demonstrated the applicability of the CLEA model to Chinese agricultural land exposure scenarios. The derived GAC are generally less stringent than the current two Chinese standards (i.e. GB 15618-2018, GB36600-2018) for most substances except for five substances (including cadmium, nickel, alpha-HCH, beta-HCH and gamma-HCH) for which the oral background intake accounts for 50% of the Total Daily Intake. This indicates that the two Chinese soil quality standards maybe over conservative, and oral background intake (i.e. MDIoral) can be a critical parameter when deriving regional GAC for Chinese agricultural land scenarios. Since there is a notable regional difference in MDIoral for some of the substances of concern, as well as in the vegetable consumption rates and vegetable varieties consumed, it is considered necessary to derive GAC for other provinces of China for agricultural land scenario, to further examine the sensitivity of MDIoral on GAC. In addition, the 13 substances of concern in this paper are some of the most prevalent contaminants in agricultural soils in China, but GAC for some emerging new contaminants, such as thallium, vanadium, should also be derived in further research.
中国农业土壤污染的广泛存在对食品安全和人类健康构成了巨大威胁。由于缺乏针对中国农业用地的基于人体健康的通用评估标准（GAC），除非进行特定地点的风险评估，否则无法有效地筛选和评估风险，而这些评估既耗时又昂贵。因此，本文使用 CLEA 模型，针对江苏省农业用地情景，为 13 种关注物质（包括异构体）推导了第一套基于人体健康的通用评估标准（GAC）。由于中国目前还没有权威的人体健康风险评估模型，本文确定并证明了 CLEA 模型在中国农业用地暴露情景中的适用性。推导的 GAC 通常比当前中国的两项标准（即 GB 15618-2018 和 GB36600-2018）对大多数物质的要求更为宽松，但对于包括镉、镍、α-HCH、β-HCH 和 γ-HCH 在内的五种物质除外，这些物质的口服背景摄入量占总日摄入量的 50%。这表明，这两项中国土壤质量标准可能过于保守，在为中国农业用地情景推导区域性 GAC 时，口服背景摄入量（即 MDIoral）可能是一个关键参数。由于一些关注物质的 MDIoral 以及蔬菜消费率和消费的蔬菜品种在不同地区存在显著差异，因此有必要为中国其他省份的农业用地情景推导 GAC，以进一步研究 MDIoral 对 GAC 的敏感性。此外，本文中关注的 13 种物质是中国农业土壤中最常见的污染物之一，但也应在进一步的研究中推导铊、钒等一些新兴新型污染物的 GAC。
