Phosphate buffer voltammogram

FIG. 26 Cyclic voltammograms of 40 monolayers of Langmuir-Schaefer films of cytochrome P450SCC on indium-tin oxide glass plate (ITO) in 10 mM phosphate buffer at a scan rate of 20 mV/s between 0.4 and —0.4 V vs. Ag/AgCl. LS films on ITO worked as the working electrode, platinum as the counter, and Ag/AgCl as the reference electrode. Cholesterol dissolved in X-triton 100 was added 50 p.1 at a time (1) with cholesterol, (2) 50 p.1 of cholesterol, (3) 100 p.1 cholesterol, and (4) 150 p.1 of cholesterol. 

Dinitrophenol (DNP) gives a single wave in NPV and a pair of anodic and cathodic peak currents in CV at the NB/W interface in pH range studied. Figure 7 shows a cyclic voltammogram of 0.6 mM DNP (NB) at O.IM TPenATPB (NB)-O.IM LiCl, 50 mM phosphate buffer, pH 6.3 (W), that can be assigned to one-proton transfer assisted by A present in NB. The E]j2 vs. pH plot is shown in Fig. 8, in which the results obtained with... 

Figure 3.89 Cyclic voltammograms of 500 pm cytochrome c at a gold electrode modified by (a) 2-mercaptopyridine, (b> 2-mercaptosuccinic acid, 4,4 -dithiobis(butanoic acid), (d) 4-mercaploaniline. pH 7.0 phosphate buffer +0.1 M NaC104. Scan rale 50mVs . From Allen...

Figure 3.91 Cyclic voltammograms of 1 mM fa) SSBipy and (b) PySH in a phosphate buffer solution with 0.1 M NaC104 (pH 7.0) at a SERS-activated gold electrode. Scan rate 50mVs , ...

E0 was estimated as ( pa+Epc)/2 in the cyclic voltammograms obtained with the SAM-modified Au electrodes in phosphate buffer at 100mVs-1. and Ep° are anodic and cathodic peak potentials of the Cu, Zn-SOD, respectively. (Reprinted from Y. 

The cyclic voltammograms of the GOx/CNT-modified GC electrodes in phosphate buffer solution (pH 7.4) show two pairs of redox peak currents. The first pair of peaks (Ei/2 = 0.09 V vs Ag AgCl) is attributed to the carboxylic acid groups in CNTs, while... 

FIGURE 15.16 Cyclic voltammograms of [GOx/CNT immobilized on PDDA/GC electrodes in 0.1 M phosphate buffer solution (pH 7.4) at O.IVs-1, indicating an increasing response of [GOx/CNT with layer number from 1 to 5 (unpublished results, J. Zhang, M. Feng, and H. Tachikawa) (see Plate 17 for color version). 

Fig, 8. Cyclic voltammograms of complex 1 (5.7 x 10 5 M in phosphate buffer pH 8.2) in the absence (A) and presence of NADH (B 7.5 equivalents NADH) (potentials vs Ag/AgCl-reference electrode, scan rate 20 mV/s)... 

Figure 2.21 Multi-voltammograms for jamesonite electrode in 0.1 mol/L KNO3 mixed phosphate buffer solution at pH = 6.86 and scanning rate of 50 mV/s...

Figure 3.20 Cyclic voltammogram of COx/SWNT/glassy carbon in pH 7.0 phosphate buffer/0.1 M KCI (solid curve) FAD/SWNT/ glassy carbon in pH 7.0 phosphate buffer/0.1 M KCI (dotted curve). Scan rate 50mV/s. Reprinted with permission from Ref [135]. Copyright, 2002, Institute of Physics publishing.

The steady-state voltammogram of UDI-coated Cu in the phosphate buffer (figure 5C) is similar to the result in pH=1 solution the curve is indistinguishable from the baseline until approximately -300mV (SCE). In the steady-state a UDI film... 

They found that a Cu electrode, pretreated by immersing it in a 0.1M BTA solution for 15 seconds, inhibited the 0 reduction reaction initially and that on subsequent cycles the currents Increased to that of bare Cu in a short time. A similar effect was observed when a Cu electrode was cycled in a ImM solution of BTA. They discovered that a solution of 0.1M BTA produced a lasting effect, indicating that a reservoir of BTA is necessary for continuous protection of the copper against corrosion. We found that bare Cu gives the same voltammogram in the 0 reduction region in both acetate buffer and phosphate buffer therefore, McCrory-Joy et. al. s results can be directly compared to the results reported here. 

Takamura et al. have reported an electrochemical method for the determination of chlorpromazine with an anodically pretreated vitreous carbon electrode [164]. Optimal conditions for the pre-treatment were attained by the anodic oxidation of vitreous carbon electrodes in 0.5 mM phosphate buffer (pH 6.7) at 1.6 V V5. S.C.E. for 2 minutes. This was found to enhance the oxidation peak of the cyclic voltammogram for chlorpromazine by a factor of simeq 30. The peak current at +0.75 V was directly proportional to the concentration of chlorpromazine over the range of 0.2-40 pM and the detection limit was 0.1 pM. 

Takamura et al. have reported a voltammetric method for the determination of chlorpromazine using an anodically oxidized carbon electrode [167]. A vitreous-carbon electrode was maintained at +1.6 V vi. S.C.E. for 2 minutes (in 0.5 M phosphate buffer at pH 6.8). Under these conditions, chlorpromazine gave an oxidation peak current on cyclic voltammograms that varied linearly with concentration over the range of 50 nM to 1 pM. 

Figure 10. (A) Cyclic voltammograms for the dendrimer 6/glucose oxidase/carbon paste electrode, recorded at 1 mV/s in pH 7.0 phosphate buffer (with 0.1 M KCI)...

Fig. 12 Cyclic voltammogram of [Mn202(phen)4] + in pH 4.5 phosphate buffer at an activated glassy carbon electrode i = 0.1 V s (reprinted with permission from Ref 97, Copyright 1992 American Chemical Society).

Fig. 33 Cyclic voltammograms obtained for the system i P2Wi7V062 /NADH. Electrolyte pH 7 phosphate buffer. Reference electrode SCE working electrode 1 mm diameter Pt disk. The solutions contain 10 M i P2Wi7V062 + M...

Fig. 2.11 Square wave voltammograms for blanks of azurite and smalt, and for two samples from the Palomino s frescoes in the Sant Joan del Mercat church in Valencia, in contact with 0.50 M potassium phosphate buffer, pH 7.4 (a) azurite, (b) sample PV8b, (c) smalt, and (d) sample PA5b. Potential scan initiated at —0.85 mV in the positive direction. Potential step increment 4 mV square wave amplitude 15mV frequency 2Hz [133]...

Fig. 2.22 Square wave voltammograms for alizarin-modified paraffin-impregnated graphite electrodes immersed into 0.50 M potassium phosphate buffer (pH 7.0) (a) before, and (b) after application of a potential step of +1.50V during 15min. Potential initiated at +1.25V in the negative direction. Potential step increment 4 mV square wave amplitude 25 mV frequency 5 Hz...

Fig. 3.11 Tafel plots for verdigris (A), atacamite (B), paratacamite (C), and cuprite (D) from linear scan voltammograms at sample-modified, paraffin-impregnated graphite electrodes immersed in 0.50 M potassium phosphate buffer (pH 7.0). Potential scan rate 50 mV/s...

Fig. 4.6 Variation of the peak currents for peaks at +0.20 (squares) and at +0.65 V (rhombs) with the percentage of Brazilwood in square-wave voltammograms for Brazilwood plus logwood mixtures in contact with a phosphate buffer. Conditions are as in Fig. 4.5. Here, identical amounts of sample were transferred to the parafiSn-impregnated graphite electrode...

Data from square-wave voltammograms for sample-modified PlGEs in contact with acetate buffer, pH 4.90, and. phosphate buffer, pH 7.00. ... 

Figure 18. Cyclic voltammograms of [PtH(PEt3)3]+ (1.5 x 10"4 mol dm 3) in phosphate buffer (pH 6.88) at a mercury drop electrode (a) first scan (b) second and subsequent scans...

Fig. 10 Cyclic voltammograms for a glassy carbon electrode, coated with the parathion-imprinted MIP film, after 10-min preconcentration in (1) 0.1 mM parathion or (2) 0.1 mM paraoxon. Supporting electrolyte, 0.1 M phosphate buffer (pH = 7.0). Potential scan rate, 100 mV s-1 (adapted from [184])...

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