Predicting the Accumulation of Organic Contaminants from Soil by Plants
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Abstract
Analytic expressions for maximum chemical concentration attained in plants, and time this takes for uptake from surrounding soil were derived from a simple two-compartment soil/water–plant model. To illustrate, for the antibiotic norflxacin undergoing first order loss in the soil/water phase with a rate constant of 0.544 days−1, maximum concentration in soybean P MAX is predicted to occur after 2.79 days exposure and be independent of initial soil/water concentration SW 0 of 52.5 mg kg−1 dry weight. For soybean, the relationship between P MAX and SW 0 is P MAX = 0.047SW 0, resulting in predicted maximum levels of 2.20 mg kg−1 dry weight. Modelled plant concentrations agreed well with experimental data (R 2 = 0.91).
Keywords
Soil/water–plant system Maximum plant concentration Time to maximum plant concentration Analytic solutions Antibiotics SoybeanNotes
Acknowledgments
This study was supported by the National Research Fund of Thailand and the Silpakorn University Research and Development Institutue. The authors would like to thank A. Boonsaner and S. Jaipan for their plant and soil preparations and O. Kaewnun for her laboratory assistance.
Supplementary material
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