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Polarographic (d.c.) measurements showed that complex ions of uranium(V1) with catechol adsorb on the dropping mercury electrode. This effect is used to determine uranium(V1) directly in sea water. Optimal conditions include pH 6.8, 2 X 10e3 M catechol, and a collection potential between -0.1 and -0.4 V (vs. Ag/AgCl) at a hanging mercury drop electrode. The cathodic scan is made with the linear-scan or differentialpulse mode (d.p.c.s.v.). The detection limit with the d.p.c.s.v. mode is 3 X lo-" M after a collection period of 2.5 min. Between pH 6 and 8, the peak height increases with pH and with catechol concentration up to 5 x 10e3 M. There is linear relationship between the collection time and the measured peak height until the drop surface becomes saturated. With a collection period of 3 min, the reduction current increases linearly with the metal concentration up to about 5 x lo-' M U(V1). The maximum adsorption capacity of the mercury drop is 4.4 X lo-"' mol cm\*; each complex ion then occupies 0.38 nm', equivalent to the size of about one catechol molecule. Interference by high concentrations of Fe(II1) is overcome by selectively adsorbing U(V1) at a collection potential near

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Author

Constant M.G Van Den Berg; Zi Qiang Huang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1984

Language

EN

Field

Chemistry (Physical Sciences)