Determination of the principal pathways of polychlorinated dibenzo-p-dioxins and dibenzofurans to Lolium multiflorum (Welsh ray grass)

Article Abstract:

The transport of involatile organic contaminants such as polychlorinated dibenzo-p-dioxins and dibenzofurans fom the soil to the leaves of the Welsh ray grass was investigated. A glass fiber filter XAD trap sampling system was used to measure contaminant concentrations in the grass during the summer and autumn periods. The soil-related pathways in the grass samples were also quantified by means of isotope dilution and gas chromatography. Results indicate that the accumulation of organic contaminants in agricultural food chains is governed by dry gaseous deposition process.

Analysis

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Soil/Air partitioning of semivolatile organic compounds. 1. method development and influence of physical-chemical properties

Article Abstract:

A method which utilizes a solid-phase fugacity meter is effective in determining the soil/air partition coefficients of semivolatile organic compounds such as chlorinated benzenes, polychlorinated biphenyls and polycyclic aromatic hydrocarbons. The method, which is very similar to gas saturation method for measuring vapor pressures, also demonstrated the ability to directly measure soil/air partition coefficients at current background levels of soil contamination.

Research and Development in the Physical, Engineering, and Life Sciences, Pollution R&D NEC, Environmental aspects, Pollution control research

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Field validation of a model of the uptake of gaseous SOC in Lolium multiflorum (rye grass)

Article Abstract:

Field measurements of the concentrations of different semivolatile organic compounds in rye grass are compared with figures predicted by a mathematical model. The results showed that there was good agreement between field measurements and model predictions, with a maximum difference of 30% in the case of dry gaseous deposition in the main uptake pathway. The octanol/air partition coefficient determined the bioconcentration factor of more volatile compounds.

Volatile organic compounds

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