The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform

Jing Wang - One of the best experts on this subject based on the ideXlab platform.

  • air Plant Exchange of brominated flame retardants at a rural site influencing factor interspecies difference and forest scavenging
    Environmental Toxicology and Chemistry, 2013
    Co-Authors: Mi Tian, Shejun Chen, Jing Wang
    Abstract:

    Brominated flame retardants (BFRs) in eucalyptus leaves and pine needles from a rural site in southern China were measured to investigate the air–Plant Exchange. Mean concentrations of BFRs were higher in pine needles (79.8 ng/g dry wt) than in eucalyptus leaves (74.5 ng/g), whereas an inverse result was found for the leaf surface particles, with mean concentrations of 3490 ng/g and 5718 ng/g, respectively. For most of the BFRs, the correlations between their concentrations in Plants and those in the vapor phase, atmospheric particles, leaf surface particles, and the environmental variables (temperature, wind speed, and relative humidity) at this site were in contrast to the results the authors observed at an electronic waste site previously, indicating that ambient air level plays a vital role in the relationships. The interspecies difference in the BFR profiles and the correlations above implied that pine needles likely have more advantages for uptake of BFRs from gaseous deposition than eucalyptus leaves, for which particle-bound deposition is more important. Like the electronic waste site, the leaf scavenging ratios of BFRs were also controlled by their octanol–air partition coefficient. It was estimated that approximately 154 kg of BFRs in the atmosphere are scavenged annually by forest in this region, which was 1.7 times larger than that via atmospheric deposition to nonforest ground. Environ Toxicol Chem 2013;32:1248–1253. © 2013 SETAC

Kevin C Jones - One of the best experts on this subject based on the ideXlab platform.

  • current issues and uncertainties in the measurement and modelling of air vegetation Exchange and within Plant processing of pops
    Environmental Pollution, 2004
    Co-Authors: Jonathan L Barber, Gareth O Thomas, Gerhard Kerstiens, Kevin C Jones
    Abstract:

    Air–vegetation Exchange of POPs is an important process controlling the entry of POPs into terrestrial food chains, and may also have a significant effect on the global movement of these compounds. Many factors affect the air–vegetation transfer including: the physicochemical properties of the compounds of interest; environmental factors such as temperature, wind speed, humidity and light conditions; and Plant characteristics such as functional type, leaf surface area, cuticular structure, and leaf longevity. The purpose of this review is to quantify the effects these differences might have on air/Plant Exchange of POPs, and to point out the major gaps in the knowledge of this subject that require further research. Uptake mechanisms are complicated, with the role of each factor in controlling partitioning, fate and behaviour process still not fully understood. Consequently, current models of air–vegetation Exchange do not incorporate variability in these factors, with the exception of temperature. These models instead rely on using average values for a number of environmental factors (e.g. Plant lipid content, surface area), ignoring the large variations in these values. The available models suggest that boundary layer conductance is of key importance in the uptake of POPs, although large uncertainties in the cuticular pathway prevents confirmation of this with any degree of certainty, and experimental data seems to show Plant-side resistance to be important. Models are usually based on the assumption that POP uptake occurs through the lipophilic cuticle which covers aerial surfaces of Plants. However, some authors have recently attached greater importance to the stomatal route of entry into the leaf for gas phase compounds. There is a need for greater mechanistic understanding of air–Plant Exchange and the ‘scaling’ of factors affecting it. The review also suggests a number of key variables that researchers should measure in their experiments to allow comparisons to be made between studies in order to improve our understanding of what causes any differences in measured data between sites.

Mi Tian - One of the best experts on this subject based on the ideXlab platform.

  • air Plant Exchange of brominated flame retardants at a rural site influencing factor interspecies difference and forest scavenging
    Environmental Toxicology and Chemistry, 2013
    Co-Authors: Mi Tian, Shejun Chen, Jing Wang
    Abstract:

    Brominated flame retardants (BFRs) in eucalyptus leaves and pine needles from a rural site in southern China were measured to investigate the air–Plant Exchange. Mean concentrations of BFRs were higher in pine needles (79.8 ng/g dry wt) than in eucalyptus leaves (74.5 ng/g), whereas an inverse result was found for the leaf surface particles, with mean concentrations of 3490 ng/g and 5718 ng/g, respectively. For most of the BFRs, the correlations between their concentrations in Plants and those in the vapor phase, atmospheric particles, leaf surface particles, and the environmental variables (temperature, wind speed, and relative humidity) at this site were in contrast to the results the authors observed at an electronic waste site previously, indicating that ambient air level plays a vital role in the relationships. The interspecies difference in the BFR profiles and the correlations above implied that pine needles likely have more advantages for uptake of BFRs from gaseous deposition than eucalyptus leaves, for which particle-bound deposition is more important. Like the electronic waste site, the leaf scavenging ratios of BFRs were also controlled by their octanol–air partition coefficient. It was estimated that approximately 154 kg of BFRs in the atmosphere are scavenged annually by forest in this region, which was 1.7 times larger than that via atmospheric deposition to nonforest ground. Environ Toxicol Chem 2013;32:1248–1253. © 2013 SETAC

Jonathan L Barber - One of the best experts on this subject based on the ideXlab platform.

  • current issues and uncertainties in the measurement and modelling of air vegetation Exchange and within Plant processing of pops
    Environmental Pollution, 2004
    Co-Authors: Jonathan L Barber, Gareth O Thomas, Gerhard Kerstiens, Kevin C Jones
    Abstract:

    Air–vegetation Exchange of POPs is an important process controlling the entry of POPs into terrestrial food chains, and may also have a significant effect on the global movement of these compounds. Many factors affect the air–vegetation transfer including: the physicochemical properties of the compounds of interest; environmental factors such as temperature, wind speed, humidity and light conditions; and Plant characteristics such as functional type, leaf surface area, cuticular structure, and leaf longevity. The purpose of this review is to quantify the effects these differences might have on air/Plant Exchange of POPs, and to point out the major gaps in the knowledge of this subject that require further research. Uptake mechanisms are complicated, with the role of each factor in controlling partitioning, fate and behaviour process still not fully understood. Consequently, current models of air–vegetation Exchange do not incorporate variability in these factors, with the exception of temperature. These models instead rely on using average values for a number of environmental factors (e.g. Plant lipid content, surface area), ignoring the large variations in these values. The available models suggest that boundary layer conductance is of key importance in the uptake of POPs, although large uncertainties in the cuticular pathway prevents confirmation of this with any degree of certainty, and experimental data seems to show Plant-side resistance to be important. Models are usually based on the assumption that POP uptake occurs through the lipophilic cuticle which covers aerial surfaces of Plants. However, some authors have recently attached greater importance to the stomatal route of entry into the leaf for gas phase compounds. There is a need for greater mechanistic understanding of air–Plant Exchange and the ‘scaling’ of factors affecting it. The review also suggests a number of key variables that researchers should measure in their experiments to allow comparisons to be made between studies in order to improve our understanding of what causes any differences in measured data between sites.

Shejun Chen - One of the best experts on this subject based on the ideXlab platform.

  • air Plant Exchange of brominated flame retardants at a rural site influencing factor interspecies difference and forest scavenging
    Environmental Toxicology and Chemistry, 2013
    Co-Authors: Mi Tian, Shejun Chen, Jing Wang
    Abstract:

    Brominated flame retardants (BFRs) in eucalyptus leaves and pine needles from a rural site in southern China were measured to investigate the air–Plant Exchange. Mean concentrations of BFRs were higher in pine needles (79.8 ng/g dry wt) than in eucalyptus leaves (74.5 ng/g), whereas an inverse result was found for the leaf surface particles, with mean concentrations of 3490 ng/g and 5718 ng/g, respectively. For most of the BFRs, the correlations between their concentrations in Plants and those in the vapor phase, atmospheric particles, leaf surface particles, and the environmental variables (temperature, wind speed, and relative humidity) at this site were in contrast to the results the authors observed at an electronic waste site previously, indicating that ambient air level plays a vital role in the relationships. The interspecies difference in the BFR profiles and the correlations above implied that pine needles likely have more advantages for uptake of BFRs from gaseous deposition than eucalyptus leaves, for which particle-bound deposition is more important. Like the electronic waste site, the leaf scavenging ratios of BFRs were also controlled by their octanol–air partition coefficient. It was estimated that approximately 154 kg of BFRs in the atmosphere are scavenged annually by forest in this region, which was 1.7 times larger than that via atmospheric deposition to nonforest ground. Environ Toxicol Chem 2013;32:1248–1253. © 2013 SETAC