The objective of the project is to design, improve and validate conceptual and instrumental tools needed for the risk assessment related to the contamination of soil and subsoil by VOCs complex mixtures from wastes or accidents.
A unique measuring technology developed by one of the partners allows the continuous and in-situ measurement of VOCs transfer potential in different environmental matrices : soil, subsoil, unsaturated zone gas phases, saturated zone groundwater. The basis of this method is the coupling of a permeation cell separating an internal gas phase from the external studied media, with a continuous global VOCs sensor. One technical objective is to develop multisensors or multidimensional signal systems on the basis of the present mono-sensor and mono-response concept.
This measuring system will give vectorial or matricial response to be considered as a characteristic "fingerprint" of the contamination, extremely more informative than global numerical values.
To perform the quantification step, it will be necessary to develop a specific model applied to the measuring system. This specific model will integrate the transfer mechanisms from the external media to the internal gas phase within the permeation cell and will prevent the influence of transfer limitations on the measurement quality. The transfer limitations take place within and between the different environmental physical media and all along the transfer from the environment to the measurement system. This will allow a direct use of the field data obtained as inputs for this VOC transfer model.
A specific procedure which allows an easier description and quantification of VOCs mobility in the field situation will be designed and validated. This procedure will include the designing of a specific sampling grid, the performing of continuous or sequential measurements, the multidimensional data treatment to describe spatial and temporal variability, and the quantification step based on the specific model applied to the measuring system.
Funding SchemeCSC - Cost-sharing contracts