Division of Environment and Resources, College of Engineering, Westlake University, Hangzhou 310024, Zhejiang, China.
MOE Key Laboratory of Environmental Remediation and Ecosystem Health, Institute of Environmental Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Environ Sci Technol. 2023 Jun 27;57(25):9277-9286. doi: 10.1021/acs.est.2c07873. Epub 2023 Jun 12.
The spatial variation and temporal trends of legacy and emerging per- and polyfluoroalkyl substances (PFASs) from 2011 to 2021 in agricultural soils of Eastern China, which is one of the largest PFAS production and consumption regions in the world, were evaluated. We found that PFOS concentration decreased by 28.2% during this period. Given that agricultural soils are sinks for persistent organic pollutants (POPs), our results suggest that the implementation of the Stockholm Convention and its indirect effects, combined with a voluntary phaseout, are effective for controlling PFOS pollution in agricultural soils in China. In addition, our results show that 19 out of 28 PFASs were detected in >40% of the samples, with concentrations being 17.6-1950 pg/g with a median of 373 pg/g. Further, legacy PFASs were major components, accounting for 63.8% of total PFASs. Based on the source appointment of PFASs via the Positive Matrix Factorization (PMF) model, the contribution ratio of consumer product industries has steadily increased from 6.10 to 26.2%, while both legacy and novel fluoropolymer industries have declined from 24.2 to 1.50 and 19.1 to 5.40%, further confirming the effectiveness of the Convention.
本研究评估了 2011 年至 2021 年期间中国东部农业土壤中遗留和新兴全氟和多氟烷基物质（PFAS）的时空变化。结果表明，在此期间，PFOS 浓度下降了 28.2%。鉴于农业土壤是持久性有机污染物（POPs）的汇，我们的研究结果表明，《斯德哥尔摩公约》的实施及其间接影响，加上自愿淘汰，对于控制中国农业土壤中 PFOS 污染是有效的。此外，我们的研究结果表明，在 40%以上的样本中检测到了 28 种 PFAS 中的 19 种，浓度范围为 17.6-1950 pg/g，中位数为 373 pg/g。此外，遗留的 PFAS 是主要成分，占总 PFAS 的 63.8%。基于正定矩阵因子分解（PMF）模型对 PFAS 来源的指派，消费品行业的贡献率从 6.10%稳步增加到 26.2%，而传统和新型氟聚合物行业的贡献率则从 24.2%和 19.1%分别下降到 1.50%和 5.40%，进一步证实了该公约的有效性。
