IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Hydroponic uptake and distribution of PPCPs in Typha lafitolia and Zea mays: A comparative study in two monocotyledon model plants.
Autor/es:
DOUCETTE, WILLIAM; MENONE, MIRTA LUJÁN; PÉREZ, DÉBORA JESABEL
Lugar:
Sacramento, Californa
Reunión:
Congreso; SETAC North America 39th Annual Meeting; 2018
Institución organizadora:
Society of Environmental Toxicology and Chemistry
Resumen:
Pharmaceuticals and personal care products (PPCPs), originating from wastewater treatment plants, have been detected in reclaimed waters and aquatic ecosystems potentially resulting in the accumulation of PPCPs in wetland plants and terrestrial crops. The objective of this study is to investigate the root uptake, translocation and distribution of a mixture of PPCPs and the herbicide atrazine, in two monocotyledon plants, one wetland plant Typha latifolia and one terrestrial plant Zea mays. The target PPCPs included antibiotics (sulfamethoxazole (SMZ) and triclosan (TRI)), an anticonvulsant (carbamazepine (CBZ)), an antidepressant (fluoxetine (FLX)), and an antihyperlipidemic (gemfibrozil (GBZ)). Atrazine (ATZ) was also selected as a herbicide commonly used on corn. Twelve size uniform plants of each specie were selected for the hydroponic exposure assay. Six plants were used as untreated controls and six were treated. A single dose was added to the hydroponic containers to yield an initial concentration of 20 µg/L for each compound. Transpiration was measured by water lost in the root-zone vessels relative to a non-planted control. The root zone solution was replenished weekly with a nutrient solution containing 20 µg/L of the target compounds. For T.latifolia, root, rhizome, sprout, stem and leaf (base, middle and tip) tissues were collected and analysed while root, stem, base and top leaves and bud flowers were examined for Z.mays. Sample extracts were analysed using liquid chromatography coupled to a tandem mass spectrometer. All target compounds were detected in the roots of both plants. Above ground tissue concentrations were normalized to the amount of water transpired. For T. latifolia, only PPCPs and ATZ were found in the stems while the distribution of target compounds in the leaves had the following pattern: CBZ was accumulated in the mainly tip FLX mainly in the base and ATZ and TRI more uniformly in the all leaves. In corn leaves CBZ, FLX and ATZ were mainly accumulated in the base leaves and the transpiration normalized concentrations were lower than for T.latifolia. The rhizoma and sprouts of T.latifolia also contained measurable concentrations of the target compounds. No target compounds were detected in corn bud flowers. The results show the importance of examining the distribution of contaminants within the various plant tissues before conducting risk or biomonitoring assessments.