engleski

Square-wave voltammetry of uranyl-humate complex

Square-wave voltammetric measurements were applied to the identification and determination of the uranyl-humate complex in 0.55 mol 1−1 NaCl solution and in artificial and natural sea water. The sensitivity of the square-wave voltammetric response can be enhanced by the accumulation of the complex because of its strong adsorption at the electrode surface. The detection limit for the uranyl-humate complex after an accumulation period of 10 min at a potential 0.0 V vs. a sodium chloride-saturated Ag/AgCl electrode was found to be (5.0 ± 0.2) X 10−9 mol 1−1 and the maximum surface concentration of the adsorbed reactant was Γs=(7.1±0.1)X10−11 mol cm−2. The mechanism of the electrode reaction was established. The interferences of various cations and surface-active substances were studied.

voltammetry; humic substances; sea water; uranium; waters

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