Levels,distributions,and sources of legacy and novel per-and perfluoroalkyl substances (PFAS) in the topsoil of Tianjin,China

• 作者: Donghui Ma Huifang Zhong Jitao Lv Yawei Wang Guibin Jiang
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Regular articles
• 页码范围: 71-81
• 页数: 11页
• 语种: 英文

摘要

Soil is a major sink for per-and perfluoroalkyl substances (PFAS),wherein PFAS may be transferred through the food chain to predators at upper trophic levels,which poses a threat to human health.Herein,the concentrations and distributions of legacy and novel PFAS in topsoil samples from different functional areas in Tianjin were comprehensively investi-gated.Seventeen PFAS congeners were identified,with concentrations ranging from 0.21 ng/g to 5.35 ng/g,with a mean concentration of 1.25 ng/g.The main PFAS in the topsoil was perfluorooctanoic acid (PFOA).6∶2 chlorinated polyfluorinated ether sulfonate (6∶2 Cl-PFESA;＜MDL-1.95 ng/g,mean 0.11 ng/g),as an emerging substitute for perfluorooctane sul-fonate (PFOS),was also detected in the topsoil.It showed slightly higher concentrations than PFOS (＜MDL-1.62 ng/g,mean 0.10 ng/g),indicating it has gradually replaced legacy PFOS in this area.Based on the positive-definite matrix factor (PMF) receptor model,the major PFAS sources was dominated by textile treatment,metal electroplating plants,and some poten-tial precursors of PFAS with longer chains (＞C8) were the major sources (43.4％),followed by food packaging as well as coating materials (25.5％).In addition,Spearman correlation analysis and the structural equation model showed that population density significantly impacted the PFAS distribution in the topsoil of Tianjin.