the net molecular charge of the humic and fulvicacids, which represent well the major UV-absorbingsubstances. These two factors subsequently lead to agreater removal of UV-absorbing substances (mainlyhumic and fulvic acids) by Al(III)/Fe(III) coagulants.However, of the two reasons mentioned above, thefirst (coagulant species) appears to be the moreimportant.
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