Modelling uptake into roots and subsequent translocation of neutral and ionisable organic compounds

Trapp, Stefan

doi:10.1002/1526-4998(200009)56:9<767::aid-ps198>3.0.co;2-q

Cited by 263 publications

(90 citation statements)

References 33 publications

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“…Subsequently the BDE-28 concentration in the solution continued to decrease and reached 0.57 ng/mL, while BDE-47 had a slight decrease and BDE-99 showed almost no change. Root concentration factors (RCFs), calculated as the ratio of the concentration in roots to that in the exposure solution (Trapp, 2000), were 4003.8, 6410.2 and 7304.1 for BDE-28, -47 and -99 respectively after one day of exposure, confirming the higher root uptake of compounds with higher K ow values (Burken and Schnoor, 1998;Lin et al, 2007;Liu and Schnoor, 2008). No.…”

Section: Uptake Of Pbdes By Maize Rootsmentioning

confidence: 81%

Uptake, translocation, and debromination of polybrominated diphenyl ethers in maize

Zhao

Zhang

Wang

et al. 2012

Journal of Environmental Sciences

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Uptake, translocation and debromination of three polybrominated diphenyl ethers (PBDEs), , in maize were studied in a hydroponic experiment. Roots took up most of the PBDEs in the culture solutions and more highly brominated PBDEs had a stronger uptake capability. PBDEs were detected in the stems and leaves of maize after exposure but rarely detected in the blank control plants. Furthermore, PBDE concentrations decreased from roots to stems and then to leaves, and a very clear decreasing gradient was found in segments upwards along the stem. These altogether provide substantiating evidence for the acropetal translocation of PBDEs in maize. More highly brominated PBDEs were translocated with more difficulty. Radial translocation of PBDEs from nodes to sheath inside maize was also observed. Both acropetal and radial translocations were enhanced at higher transpiration rates, suggesting that PBDE transport was probably driven by the transpiration stream. Debromination of PBDEs occurred in all parts of the maize, and debromination patterns of different parent PBDEs and in different parts of a plant were similar but with some differences. This study for the first time provides direct evidence for the acropetal translocation of PBDEs within plants, elucidates the process of PBDE transport and clarifies the debromination products of PBDEs in maize.

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Section: Uptake Of Pbdes By Maize Rootsmentioning

confidence: 81%

Uptake, translocation, and debromination of polybrominated diphenyl ethers in maize

Zhao

Zhang

Wang

et al. 2012

Journal of Environmental Sciences

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“…In comparison, root concentrations of BDE-15, BDE-28 and BDE-47 were consistently higher than those of PCB-15, PCB-28 and PCB-47, respectively. To compare the uptake abilities of PBDEs and PCBs by roots, root concentration factor (RCF), defined as the ratio of concentration in roots (lg kg À1 ) to concentration in external solution (lg L À1 ), was calculated (Trapp, 2000). The RCFs for the PBDEs and PCBs were plotted against their log K ow values and shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Uptake, translocation and metabolism of polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in maize (Zea mays L.)

Wang¹,

Zhang²,

Huang³

et al. 2011

Chemosphere

100

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a b s t r a c tA hydroponic experiment was conducted in the present study to investigate and compare plant uptake, translocation and metabolism of polybrominated diphenyl ethers (PBDEs) of BDE-15, BDE-28 and BDE-47 and polychlorinated biphenyls (PCBs) of PCB-15, PCB-28 and PCB-47 in maize. Root concentrations of BDE-15, BDE-28 and BDE-47 were consistently higher than PCB-15, PCB-28 and PCB-47, respectively. A significantly positive correlation was found between log RCF (root concentration factor) and log K ow of these PBDEs and PCBs, suggesting a control role of their partitioning in plant uptake. The translocation factors (TFs, C stem /C root ) of PBDEs were generally lower than those of PCBs of the same halogen-substitutions, demonstrating easier transport of PCBs than PBDEs. Metabolites mono-, di-and tri-BDEs and PCBs were detected, suggesting the existence of in vivo metabolism of PBDEs and PCBs in maize. Dehalogenation and rearrangement of halogen atoms were identified, and some similarities but also significant differences existed between the PBDEs and PCBs. PBDEs in maize were, in general, more susceptible to metabolism compared with PCBs of the same halogen-substitutions. This is the first comparative report on the uptake, translocation and metabolism of PBDEs and PCBs in plants.

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“…casparian bands, suberin lamellae, and secondary wall thickenings) results in the deposition of lipid rich compounds, which have been indicated as major sorption sites for the partitioning of lipophilic compounds in plant roots (Trapp, 2000;Wild et al, 2005). Consequently, the more complex hypodermis of T. latifolia roots, with their greater lipid content, may provide some explanation for the higher TCS accumulation observed in this study.…”

Section: Bioconcentration Patterns Among Speciesmentioning

confidence: 56%

Bioconcentration of triclosan, methyl-triclosan, and triclocarban in the plants and sediments of a constructed wetland

et al. 2012

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Triclosan and triclocarban are antimicrobial compounds added to a variety of consumer products that are commonly detected in waste water effluent. The focus of this study was to determine whether the bioconcentration of these compounds in wetland plants and sediments exhibited species specific and site specific differences by collecting field samples from a constructed wetland in Denton, Texas. The study showed that species-specific differences in bioconcentration exist for triclosan and triclocarban. Site-specific differences in bioconcentration were observed for triclosan and triclocarban in roots tissues and sediments. These results suggest that species selection is important for optimizing the removal of triclosan and triclocarban in constructed wetlands and raises concerns about the long term exposure of wetland ecosystems to these compounds. (2010), I also hypothesized that the bioconcentration of TCS, MTCS, and TCC by P. cordata would be greater than S. graminea. Analyte Concentration Patterns in Plants and Sediment at Different LocationsThe ability of constructed wetlands to effectively treat organic contaminants, such 5 as PPCPs, is generally related to the multiple destructive (e.g. phyto-and microbial degradation) and non-destructive (e.g. sorption, volatilization, plant uptake) processes that are simultaneously ongoing in constructed wetlands systems (Imfeld et al., 2009).Although the contribution of individual processes to overall treatment efficacy is hard to quantify, longer exposure of the pollutant load to the constructed wetland environment (i.e. hydraulic retention time) has been associated with increased removal efficiencies (Matamoros et al., 2008). Thus, the exposure concentrations and, by extension, the amount of contaminants available for bioconcentration in wetland plants and sediments would also be expected to decrease as the plug of effluent water travels through the constructed wetland. As part of my study, I conducted an experiment to test the theory that wetland plants and sediments are exposed to progressively lower concentrations of the target contaminants by comparing the bioconcentration of TCS, MTCS, and TCC in plant tissues and sediments at different locations within an operational constructed wetland. The practical implications of this research include 1) the documentation constructed wetland PPCPs removal efficiency via bioconcentration patterns in wetland plants tissues and sediments. I hypothesized that analyte concentrations in plant tissues and sediments at the wetland inflow would be greater than the wetland outflow. Relationship between Analyte Concentrations in Tissues and SedimentsExisting models concerning the ability of plants to uptake organic contaminants is SamplingCollection sites were located at the inflow (Site 1), outflow (Site 3), and a third site (Site 2) representing the midpoint of the flow path between the inflow and outflow. 10Each site consisted of a rectangular plot measuring 3.1m x 6.1m (10ft x 20ft) oriented parallel to the flow of water. Do...

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Modelling uptake into roots and subsequent translocation of neutral and ionisable organic compounds

Cited by 263 publications

References 33 publications

Uptake, translocation, and debromination of polybrominated diphenyl ethers in maize

Uptake, translocation, and debromination of polybrominated diphenyl ethers in maize

Uptake, translocation and metabolism of polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in maize (Zea mays L.)

Bioconcentration of triclosan, methyl-triclosan, and triclocarban in the plants and sediments of a constructed wetland

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