Studies on the effects of Al(III) on the lactate dehydrogenase activity by differential pulse voltammetry
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Differential pulse voltammetry
Polarography
Differential pulse voltammetry
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Differential pulse voltammetry
Mercury
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Tetramer
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The polarographic reduction of the title azo dye has been studied, a mechanism has been proposed and optimal conditions have been found for its analytical use. The detection limit using a classical dropping mercury electrode was 2 . 10 -7 mol l -1 for TAST polarography and 1 . 10 -8 mol l -1 for differential pulse polarography. Using a hanging mercury drop electrode, the detection limit was 9 . 10 -9 mol l -1 for fast scan differential pulse voltammetry and 1 . 10 -8 mol l -1 for linear scan voltammetry. Adsorption accumulation of the test substance on the surface of the hanging mercury drop electrode led to a further decrease in the detection limit to 1 . 10 -9 mol l -1 for fast scan differential pulse voltammetry and 7 . 10 -10 mol l -1 for linear scan voltammetry.
Polarography
Differential pulse voltammetry
Mercury
Adsorptive stripping voltammetry
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The electrochemical response of 7-methylguanosine in pH 1.98 B-R buffer was investigated by cyclic voltammetry(CV),linear sweep voltammetry(LSV) and differential pulse voltammetry(DPV) method.The differential pules voltammetry exhibited an oxidation current peak of 7-methylguanosine at the potential of +1.036 V(vs.SCE).The peak current is linearly increased with the concentration of 7-methylguanosine in the range of 5.0×10-5~2.0×10-6 mol/L.The detection limit is 4.1×10-7 mol/L.The possible mechanism for the irreversible reaction was assumed to be the oxidation lossing of one proton and two electrons.
Differential pulse voltammetry
Linear sweep voltammetry
Peak current
Electroanalytical method
Buffer solution
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Direct current (DC) voltammetry and differential pulse (DP) voltammetry using a carbon paste electrode (CPE) have been used for the determination of trace amounts of ecotoxic 1,2-diaminoanthraquinone (DAAQ). The limit of determination ( L D ) of DAAQ for DC voltammetry was 2 × 10 –6 mol l –1 , and for DP voltammetry 2 × 10 –7 mol l –1 under the optimized conditions in a mixed Britton–Robinson buffer pH 12 and methanol (1:9) medium. Adsorptive accummulation of the analyte on the surface of CPE decreased the limit of determination to 2 × 10 –8 mol l –1 for DP voltammetry. Practical applicability of these newly developed methods was verified on model samples of river water.
Differential pulse voltammetry
Carbon paste electrode
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The paper discusses some rather non-traditional uses of polarography and voltammetry which are beyond common polarographic routine in analytical laboratories. Some potentials of polarography in the biological and biochemical fields are treated spanning from in vivo measurements to sensors for diagnostic purposes in medicine and toxicology. Examples are given of analyses in the solid and gas phases as well as the use in tribodiagnostics in determination of machine wear.
Polarography
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Polarographic and voltammetric behavior of 1,5-dinitronaphthalene was investigated using tast polarography and differential pulse polarography at a classic dropping mercury electrode and differential pulse voltammetry and adsorptive stripping voltammetry at a hanging mercury drop electrode. Optimum conditions have been found for the determination of tested substance in the concentration range 2-10 μmol l -1 in tast polarography, 0.2-1 μmol l -1 in differential pulse polarography at a classic dropping mercury electrode or differential pulse voltammetry at a hanging mercury drop electrode, and 0.02-0.1 μmol l -1 using adsorptive stripping voltammetry. A possible mechanism of the electrochemical reduction of 1,5-dinitronaphthalene at mercury electrodes is discussed.
Polarography
Mercury
Adsorptive stripping voltammetry
Differential pulse voltammetry
Anodic Stripping Voltammetry
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Voltammetric behaviour of 1-Methylguanosine(1-MG) has been investigated at Glassy Carbon Electrode(GCE) by cyclic voltammetry(CV), linear sweep voltammetry(LSV), differential pulse voltammetry(DPV), square ware voltammetry(SWV). In the Britton-Robinson(pH2.0) buffer solution, one well-defined oxidation peak of 1-MG is proportional to the concentration of 1-MG over the range of 4.0×10~(-7)～1.0×10~(-5) mol/L.The detection limit is 6.6×10~(-8) mol/L. This method was successfully applied to the analysis of urine samples and serum sample with recoveries 96.0%～102.0%.
Differential pulse voltammetry
Linear sweep voltammetry
Buffer solution
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The Differential Alternative Pulses Voltammetry (DAPV) combining the high sensitivity of the Differential Pulse Voltammetry with the increased resolution of the second order voltammetric techniques was applied for on-site simultaneous determination of species as As(III), Pb(II) and Tl(I) in industrial solution without preliminary species separation. The limits of the species concentration ratios allowing simultaneous determination with preset precision of les than 10% were determined. The method was applied for determination in real industrial solutions.
Differential pulse voltammetry
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