Naslov
Adsorption of trace metals from seawater onto solid surfaces: Analysis by anodic stripping voltammetry

Autori
Cuculić, Vlado ; Branica, Marko

Izvornik
Analyst (0003-2654) 121 (1996), 8; 1127-1131

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
adsorption ; isotherm ; cadmium(II) ; lead(II) ; copper(II) ; seawater ; glass ; quartz ; fluorinated ethylene-poly(propylene)

Sažetak
The rates and equilibria of the adsorption of dissolved Cd(II), Pb(II), and Cu(II) (at concentration levels of 2x10-8 and 8x10-8 mol/l) from seawater and from a 0.55 mol/l NaCl model solution onto electrochemical glass and quartz cells and Nalgene (fluorinated ethylene- poly(propylene) sample bottles with and without added glass beads at pH 6.2 and 8.1 were measured by differential pusle anodic stripping voltammetry. Lead(II) shows higher adsorption than Cu(II), whereas no adsorption of Cd(II) is observed. Nalgene is the most suitable material for samplers and storage bottles, whereas quartz is the best material for the electroanalytical vessels. The maximum surface covering concentrations of Pb(II) (veliko slovo gama neizmjerno) (from seawater at pH 8.1) on the surfaces of a quartz cell, a glass cell, a Nalgene bottle and glass beads were found to be 2.0 x 10- 11, , 3.1x10-11, 2, 0x10-12 and 2.6x10-11 mol cm-2, respectively. The maximum Pb capacities of the glass and quartz cells with the electrode assembly were calculated to be 2.3x10-9 and 1.5x10-9 mol, respectively. A procedure is proposed for the measurement of the trace metal capacity of the cell and the electrode assembly used in the experiments, for the determination of the metal concentration in natural samples.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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