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- E-ISSN 2288-8985
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Determination of Estrone by Adsorptive Stripping Voltammetry
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1999, v.12 no.1, pp.34-39
Hong,
T., Kyong,
J. B., Lee,
H. J., &
Czae,
M.
(1999). Determination of Estrone by Adsorptive Stripping Voltammetry. Analytical Science and Technology, 12(1), 34-39.
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Abstract
Estrone such as estriol and estradiol can not be determined by votammetric methods, because these are electrochemically inactive in the potential windows for mercury drop electrode. Nitro-derivatives of estrone are electro active and nitration of estrone is accomplished by heating the solution involving estrone and sodium nitrite in a water-bath at <TEX>$100^{\circ}C$</TEX> for 30 min. Such nitro-derivatives are determined directly by voltammetry. The electrochemical behavior for nitrated estrone was investigated by cyclic voltammetry. The trace estrone was determinated by differential pulse adsorptive cathodic stripping voltammetry. Nitrated estrone gives a well defined voltammetric wave at ca. - 0.61 V (vs. Ag/AgCl electrode). The electrochemical reaction was irreversible process in sodium borate buffer at pH 11 and nitrated estrone was strongly adsorbed on the surface of mercury electrode. The optimal experimental conditions for the determination of nitrated esterone were found to be 0.05 M sodium nitrate, 0.01 M sodium borate, pH 11.0, and an accumlation potential of 0.10 V (vs. Ag/AgCl). The detection limit was as low as <TEX>$1{\times}10^{-9}M$</TEX> for estrone with 2 min accumulation time.
- keywords
- estrone, adsorptive stripping, voltammetry
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