The Netherlands, was usedfor the electrochemical measurements. The integrated three-electrodestripswereconnected to theAutolabPGSTAT-12witha specially adapted electrical edge connector supplied fromDropSens (Milton Keynes, UK).For comparisonpurposes, the polarograph (797 VA Compu-trace, Metrohm) with a HMDE was used as a reference systemto determine the metal concentration.The pH values were determined with a Crison Model GLP22 pH meter.2.2. Experimental conditionsThe measurements were performed immersing the SPE ina 10mL of standard or sample solution and metal concen-trations were determined by square wave voltammetry. Thevoltammetric parameters for the experiments were: condi-tioning potential−0.15V for 60s, deposition potential−1.1Vfor 120s, equilibration time 30s, SW amplitude (Ep)28mV,step potential (Es) 3mV and frequency (f) 15Hz. Stirring condi-tionswereusedduring the conditioning and the accumulationsteps, whereas the equilibration step and the square wavescanwasperformed inaquiescent solution.Nooxygenremov-ing was performed.
đang được dịch, vui lòng đợi..
