title: Substance flow analysis and assessment of environmental exposure potential for triclosan in mainland China.
abstract: Triclosan (TCS) is a widely-used antimicrobial agent in many consumer products around the world, and China is a major producer and consumer of TCS. In this study substance flow analysis (SFA) was used to construct a static model of anthropogenic TCS metabolism in China in 2008. The systematic SFA results were used to determine possible exposure pathways and trends in environmental exposure potential through different pathways. TCS discharged in wastewater mainly flowed into surface water sediment, ocean, and soil, where it accumulates in aquatic and agricultural products that may pose a higher risk to human health than brief exposure during consumption. Only 22% of TCS discharged was removed in the built environment with the remainder discharged into the natural environment, indicating that anthropogenic TCS metabolism in China is unsustainable. Per capita TCS consumption increased 209% from 2003 to 2012, resulting in increased discharge and accumulation in the environment. If current trends continue, it will increase to 713 mg capita(-1) yr(-1) in 2015 and 957 mg capita(-1) yr(-1) in 2020. Accordingly, annual environmental exposure potential will increase from 388 mg capita(-1) in 2008 to 557 mg capita(-1) in 2015 and 747 mg capita(-1) in 2020, indicating an increasing trend of exposure to environmental TCS. Results of Pearson correlation analysis suggested that feasible countermeasures to reduce environmental exposure potential for triclosan would include encouraging the development of small cities, raising awareness of health risks, nurturing environmentally-friendly consumer values, and improving the environmental performance of TCS-containing products.
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, 1799, Jimei Road, Xiamen 361021, China; Department of Resources and Environmental Sciences, Quanzhou Normal University, 398, Donghai Street, Quanzhou 362000, China.
authors.forename: Chu-Long
authors.initials: CL
authors.lastname: Huang
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, 71, Chou-Shan Road, Taipei 10660, Taiwan.
authors.forename: Hwong-Wen
authors.initials: HW
authors.lastname: Ma
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, 1799, Jimei Road, Xiamen 361021, China. Electronic address: cpyu@iue.ac.cn.
authors.forename: Chang-Ping
authors.initials: CP
authors.lastname: Yu
mesh_terms: D000891:Anti-Infective Agents, Local / Q000032:analysis*; D002681:China; D004781:Environmental Exposure / Q000706:statistics & numerical data*; D014260:Triclosan / Q000032:analysis*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000891:Anti-Infective Agents, Local; D014874:Water Pollutants, Chemical; D014260:Triclosan
keywords: China; Environmental exposure potential; Substance flow analysis; Triclosan