Surface complexation article 8 priority journal 8 Adsorption 6 Oxalic acid 6 oxalic acid 6 pH 6 Complexation 4 Dissolution 4 aqueous solution 4 complex formation 4 concentration (parameters) 4 dissolution 4 infrared spectroscopy 4 isotherm 4 nickel 4 pH effects 4 ATR 2 Adsorption isotherms 2 Agglomeration 2 Aluminum Hydroxide 2 Anion concentrations 2 Arsenate 2 Arsenate uptake 2 Arsenates 2 Calcined form 2 Carboxylic acids 2 Charge reversal 2 Chloride concentrations 2 Chloride ions 2