Why at higher initial concentrations does the removal of HMs become low and then increase?

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How to calculate average trend in maximum annual NDVI from MODIS?

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Mahesh Radhakrushna Gadekar

I think its like Monod's equation, like at certain level it reach to the saturation and removal of HM becomes less at higher conc which is beyond the limits.

Ahmad Hosseini-Bandegharaei

Both of driving force (HM concentration/sorbent dose) and equilibrium constant (Kd=Csolution/Csorbent) can explain your obtained results.

Dr Ismat

actually at higher concentration the active centres are saturated that's why the rate of adsorption will be decreased