期刊
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
卷 34, 期 10, 页码 2222-2230出版社
WILEY
DOI: 10.1002/etc.3068
关键词
Bioaccumulation; Biodistribution; Emerging contaminants; Reclaimed water
资金
- US Department of Agriculture's Agriculture and Food Research Initiative [2011-67019-21118]
- National Science Foundation Engineering Education and Centers Award [1028968]
- Directorate For Engineering
- Div Of Engineering Education and Centers [1028968] Funding Source: National Science Foundation
- NIFA [2011-67019-21118, 579970] Funding Source: Federal RePORTER
Arid agricultural regions often turn to using treated wastewater (reclaimed water) to irrigate food crops. Concerns arise, however, when considering the potential for persistent contaminants of emerging concern to accumulate into plants intended for human consumption. The present study examined the accumulation of a suite of 9 contaminants of emerging concern into 2 representative food crops, lettuce and strawberry, following uptake via the roots and subsequent distribution to other plant tissues. Calculating accumulation metrics (concentration factors) allowed for comparison of the compartmental affinity of each chemical for each plant tissue compartment. The root concentration factor was found to exhibit a positive linear correlation with the pH-adjusted octanol-water partition coefficient (D-OW) for the target contaminants of emerging concern. Coupled with the concentration-dependent accumulation observed in the roots, this result implies that accumulation of these contaminants of emerging concern into plant roots is driven by passive partitioning. Of the contaminants of emerging concern examined, nonionizable contaminants, such as triclocarban, carbamazepine, and organophosphate flame retardants displayed the greatest potential for translocation from the roots to above-ground plant compartments. In particular, the organophosphate flame retardants displayed increasing affinity for shoots and fruits with decreasing size/octanol-water partition coefficient (K-OW). Cationic diphenhydramine and anionic sulfamethoxazole, once transported to the shoots of the strawberry plant, demonstrated the greatest potential of the contaminants examined to be then carried to the edible fruit portion. Environ Toxicol Chem 2015;34:2222-2230. (c) 2015 SETAC
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