Equation purposed by Hakason for evaluation of potential ecological risk given as under:

RIi = (Ti*Ci)/Si

Where

Ti is the Background value of elements

Ci is the actual concentration of an element

Si is the biological coefficient of element

I want to know about Si (background values of elements like Cr, Fe, Mn, and Zn) in water and Ti ( biological coefficient of Fe, Cr, Mn, and Zn).

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