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spec: The increase in divalent cation concentrations within the waste residual stream promoted destabilisation of the negatively charged colour molecules within the CFBW , thereby causing the colloidal content to become more hydrophobic . CFBW settled water quality could be achieved through the addition of the divalent cations , thereby adjusting the monovalent to divalent ( M :D ) ratios of the wastewater . Not to be underestimated was another factor . Few corporations will send you money just because you are a student club . VERSENE 100 chelating agent is recommended for the control of hardness ions above a pH of 6.0 ; most divalent heavy metal ions throughout the pH range ; and ferric ions to below a pH of 8.0 . The ubiquity of ATMs makes funds accessible , but sooner or later every expatriate faces the need to open a bank account in a foreign country . But he was persuaded that on examination of the American experiments it would be found to be a trifle light as air . Na super ( + ) , K super ( + ) ) and added divalent cations ( i.e. Ca super ( 2 + ) , Mg super ( 2 + ) ) aided in the settling mechanism through charge neutralisation - precipitation .