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- W630083081 abstract "A satisfactory method was obtained for the determination ofphosphate, arsenate and germanium as heteropoly acids by flow injection amperometry at a sessile mercury drop electrode held at0.22Vf 0.23V and 0.18V vs SCE, respectively, without deoxygenaticn ofthe eluent or the sample solutions. Previous workers had shown thatgermanium could not be determined at a glassy carbon electrode owingto adsorption, and that arsenate could cnly be determined down to the10-5M level owing to deterioration of the baseline.The sessile mercury drop electrode was found to be particularlyuseful at low negative and low positive potentials where oxygen isnot reduced and therefore does not interfere, or at more negativepotentials in alkaline solutions, where sulphite can be added toremove oxygen traces. This was illustrated by the determination ofnitrofurantoin at -0.7V in pH 7.5, with added sulphite.The effect of electrochemical pretreatment of a glassy carbonelectrode by holding it at about +2. OV for 2 min and then at about-1. OV for 2 min on the electrochemical oxidation of ascorbic acid,dopamine, dopac, HVA, arterenol and 5 HIAA was studied. Thepretreatment of the electrode produced a substantial improvement inthe shape of voltammograms, and in the reproducibility of both peakpotential and peak current. Considerable shifts of peak potentialsto less positive values, and substantial increase in peak heightswere obtained by the electrode pretreatment. In the case of HVAdifferent oxidation products were obtained at pretreated anduntreated electrodes. Ascorbic acid and dopamine peaks werepartially separated at the pretreated glassy carbon electrode. Onlinedetermination of ascorbic acids, dopamine and dopac is improvedwith the use of a pretreated glassy carbon electrode. Morereproducible and higher signals are obtained with a shift of thehydrodynamic voltammograms to less positive potentials, than when a newly polished untreated electrode is used. (Continues...)." @default.
- W630083081 created "2016-06-24" @default.
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- W630083081 date "1986-01-01" @default.
- W630083081 modified "2023-09-26" @default.
- W630083081 title "Flow injection amperometry and associated studies" @default.
- W630083081 hasPublicationYear "1986" @default.
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