Commonly used models to predict metal bioavailability consider the free ion
as the major bioavailable species.
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Here one side of the junction was chosen as Sample 1 in Table 1 and the other side as Sample 1 in Table 2 so as to keep the free ion
concentration equal on each side.
The free ion
activities of Cd, Cu, Ni, and Zn were calculated from soil solution parameters described above, using WHAM (Windermere Humic Aqueous Model) version 6.
This variation is due to the difference in the concentration of free ion
due to the presence of industry waste, which contain free ions
like K+ Cl-.
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Although substantial proportions of solution Pb were complexed by soluble organic matter, free ion
3) A states and the next higher laying free ion
The difference between the voltage readings at the two positions is indicative of differences in free ion
concentrations at the two locations.
activity of trace metals is considered a good indicator of bioavailability (McBride 2001; Hough et al.