Transpiration stream concentration factor, TSCF

Estimating the Transpiration Stream Concentration Factor (TSCF) and Root Concentration Factor (RCF) for Some Typical Contaminants (8)... 

Root uptake has been proven to be an important pathway for contaminants with intermediate octanol-water partitioning coefficients (Aiow)- Variable uptake of an organic compound by different plants has been observed. Plant species such as Daucus carota (carrot) and Pastinaca sativa (parsnip) with swollen storage roots did not translocate chemicals as well as expected from barley experiments. While the lipid content was considered a factor, plant structure, root types, and other properties may all play a role. The effect of the chemical itself was best illustrated by the increasing root concentration factor (RCF) and the bell-shaped transpiration stream concentration factors (TSCF) relative to logAiow- The physiochemical properties of compounds, including the Ko, solubility, and... 

The efficiency with which a compound moves into the shoot is defined by the transpiration stream concentration factor, TSCF... 

However, at the endodermis, which is the cylindrical sheath of cells that surround the vascular tissues, the apoplastic pathway is blocked by the Casparian strip. If compounds are to enter the stele and reach the xylem vessels, they must pass through the plasmalemma membrane of the endo-dermal cells and so enter the symplasm. The transpiration stream concentration factor (TSCF) describes the efficiency of this process for compounds relative to that for water " ... 

The relative tendency of a chemical to move from root to shoot (above ground tissue) tissue is often described by the transpiration stream concentration factor (TSCF), the ratio of the chemical s concentration in the xylem sap to that in the solution to which the plant root is exposed. 

TSCF Transpiration stream concentration factor (dimensionless) u Air velocity (m/s)... 

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