title: Tenax as sorption sink for in vitro bioaccessibility measurement of polycyclic aromatic hydrocarbons in soils.
abstract: Physiologically based in vitro methods have been developed to measure bioaccessibility of organic contaminants in soils. However, bioaccessibility of hydrophobic organic contaminants (HOCs) can be underestimated by in vitro tests if gastrointestinal (GI) solution fails to provide sufficient sorption sink for HOCs. To circumvent this drawback, Tenax was included in GI solution as sorption sink to trap mobilized HOCs and maintain the desorption gradient between soil and GI solution. Polycyclic aromatic hydrocarbons (PAHs) were selected as target HOCs, and physiologically based extraction test (PBET) was selected as the in vitro method. Inclusion of Tenax in GI solution increased bioaccessibility of PAHs in five spiked soils from 8.25-20.8% to 55.7-65.9% and the bioaccessibility of PAHs in a field contaminated soil from 3.70-6.92% to 16.3-31.0%. Our results demonstrated the effectiveness of Tenax as sorption sink to enhance PAH mobilization in bioaccessibility measurement in soils.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China. Electronic address: lizzycui@nju.edu.cn.
authors.forename: Xin Yi
authors.initials: XY
authors.lastname: Cui
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China.
authors.forename: Ying Ying
authors.initials: YY
authors.lastname: Fan
authors.affiliation: Institute of Soil Science, Chinese Academy of Sciences, Jiangsu 210008, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Teng
authors.affiliation: National Laboratory of West China's Environment System, College of Resource & Environment, Lanzhou University, Lanzhou 730000, China.
authors.forename: Zhong Ren
authors.initials: ZR
authors.lastname: Nan
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China; Soil and Water Science Department, University of Florida, Gainesville, FL 32611, United States.
authors.forename: Lena Q
authors.initials: LQ
authors.lastname: Ma
mesh_terms: D065966:Absorption, Physicochemical; D004784:Environmental Monitoring / Q000379:methods*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D011108:Polymers; D012987:Soil; D012989:Soil Pollutants; C010514:tenax
keywords: Bioaccessibility; In vitro; Physiologically based extraction test (PBET); Sorption sink; Tenax