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The electrochemical behaviour of Cd, Zn thionein, from rabbit liver and horse kidney, with different concentrations of Cd and Zn metal binding thioneins, was studied with respect to solution pH at the mercury drop electrode with differential pulse polarography. At pH = 7.5 the potentials corresponding to the three observed peaks are significantly different from the potentials corresponding to the pure Cd(2+) and Zn(2+) peaks. From pH =1 to pH = 10.5, phenomena of disappearance, displacement, splitting and appearance of polarographic peaks are noticed. Polarographic intensity of the three peaks is found to be linearly proportional to the total Cd, Zn thionein concentration and to the total metal, Cd and/or Zn, concentration binding to the thionein. The mechanism of the electrode processes responsible for the polarographic activity seems to be a strong adsorption of the Cd, Zn thionein on the mercury surface of the electrode.

Additional information

Authors: MUÑOZ A, JRC Geel (BE);RODRIGUEZ A, JRC Geel (BE)
Bibliographic Reference: Paper presented: Symposium on Speciation of Elements in Environmental and Biological Sciences, Loen (NO), June 16-18, 1991
Availability: Available from (1) as Paper EN 36206 ORA
Record Number: 199110840 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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