Model-based analysis of the uptake of perfluoroalkyl acids (PFAAs) from soil into plants
| Autor: | Andrea Gredelj, Stefan Trapp, Fabio Polesel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Crops
Agricultural Environmental Engineering Membrane permeability Plant uptake Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Advective flow 01 natural sciences Soil Surface-Active Agents PFOS Environmental Chemistry Soil Pollutants 0105 earth and related environmental sciences Transpiration Fluorocarbons Chemistry PFOA Public Health Environmental and Occupational Health General Medicine General Chemistry Plants Soil concentration Transpiration stream Pollution 020801 environmental engineering Partition coefficient Alkanesulfonic Acids Models Chemical Bioaccumulation Environmental chemistry Fruit Shoot Exposure assessment Environmental Monitoring |
| Zdroj: | Gredelj, A, Polesel, F & Trapp, S 2020, ' Model-based analysis of the uptake of perfluoroalkyl acids (PFAAs) from soil into plants ', Chemosphere, vol. 244, 125534 . https://doi.org/10.1016/j.chemosphere.2019.125534 |
| Popis: | Perfluoroalkyl acids (PFAAs) bioaccumulate in crops, with uptake being particularly high for short-chain PFAAs that are constantly transported with transpiration water to aerial plant parts. Due to their amphiphilic surfactant nature and ionized state at environmental pH, predicting the partitioning behavior of PFAAs is difficult and subject to considerable uncertainty, making experimental data highly desirable. Here, we applied a plant uptake model that combines advective flux with measured partition coefficients to reproduce the set of empirically derived plant uptake and soil-partitioning data for nine PFAAs in red chicory, in order to improve the mechanistic understanding and provide new insights into the complex uptake processes. We introduced a new parameter for retarded uptake (R) to explain the slow transfer of PFAA across biomembranes of the root epidermis, which has led to low transpiration stream concentration factors (TSCFs) presented in literature so far. We estimated R values for PFAAs using experimental data derived for red chicory and used the modified plant uptake model to simulate uptake of PFAA into other crops. Results show that this semi-empirical model predicted PFAAs transport to shoots and fruits with good accuracy based on experimental root to soil concentration factors (RCFdw) and soil to water partition coefficients (Kd) as well as estimated R values and plant-specific data for growth and transpiration. It can be concluded that the combination of rather low Kd with high RCFdw and the absence of any relevant loss are the reason for the observed excellent plant uptake of PFAAs. |
| Databáze: | OpenAIRE |
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