title: Sorption equilibrium of emerging and traditional organic contaminants in leafy rape, Chinese mustard, lettuce and Chinese cabbage.
abstract: Emerging and petroleum contaminants could transfer into food chains by plant uptake, potentially causing food security problems. To build a prediction model, the sorption equilibrium and uptake kinetics of toluene, p-xylene, naphthalene, bisphenol A, and 4-bromo-diphenyl ether in some common leafy vegetables including leafy rape, Chinese mustard, lettuce and Chinese cabbage were examined. The kinetic experiments revealed that high sorption rates were observed for these plants that had high lipid contents. For two emerging contaminants with polar functional groups, their resulting isotherms were strongly linear (R(2) = 0.92 to 1.00), indicating that the sorption was dominated by partitioning. Moreover, regression correlation showed that log Klip, the lipid-water partition coefficient, and log Kow, the octanol-water coefficient, for these organic chemicals were strongly linear-related, following the equation: log Klip = 0.894 × log Kow+0.219 (R(2) = 0.953). The correlation equation allows the prediction of the sorption capacity of plant species for an organic compound when the plant composition and the log Kow of the chemical are determined. This improved model containing different organic chemicals with a wide range of log Kow (2.73-4.80) and including emerging contaminants was established, which shows further utilization for predicting the sorption of organic contaminants by plants.
authors.affiliation: Department of Agricultural Chemistry, National Taiwan University, No. 1, Roosevelt Rd. Sec. 4, Taipei 106, Taiwan.
authors.forename: Chien-Ying
authors.initials: CY
authors.lastname: Yang
authors.affiliation: Department of Environmental Engineering, Van Nung University, No. 1, Van Nung Rd., Chung-Li, Tao-yuan 326, Taiwan.
authors.forename: Meei-Ling
authors.initials: ML
authors.lastname: Chang
authors.affiliation: Department of Agricultural Chemistry, National Taiwan University, No. 1, Roosevelt Rd. Sec. 4, Taipei 106, Taiwan.
authors.forename: Siang Chen
authors.initials: SC
authors.lastname: Wu
authors.affiliation: Department of Agricultural Chemistry, National Taiwan University, No. 1, Roosevelt Rd. Sec. 4, Taipei 106, Taiwan. Electronic address: yhs@ntu.edu.tw.
authors.forename: Yang-Hsin
authors.initials: YH
authors.lastname: Shih
mesh_terms: D001937:Brassica / Q000737:chemistry*; D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis*; D007700:Kinetics; D018545:Lactuca / Q000737:chemistry*; D008962:Models, Theoretical; D009149:Mustard Plant / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D009930:Organic Chemicals
keywords: Composition model; Lipid; Lipid-water partition coefficient; Octanol-water partition coefficient; Partition