共查询到20条相似文献,搜索用时 31 毫秒
1.
Farukh Arjmand Shamima Parveen Mala Chauhan Shaiba Parveen Sartaj Tabassum 《Transition Metal Chemistry》2006,31(2):237-245
New mononuclear and dinuclear complexes [3-hydroxyethyl-1,3,5,8,11pentaazacyclotridecane]copper(II) (1)/nickel(II) (2) perchlorate and O,O ethane bridged bis-copper(II) (3)/nickel(II) (4) macrocycles have been synthesized and characterized by various spectroscopic techniques, viz. i.r., n.m.r., e.p.r., u.v.–vis. and conductance measurements. Spectral data and conductance measurements reveal that all
the complexes are consistent with square-planar geometry and are ionic in nature. The catalytic activity of the dinuclear
Cu(II) complex (3) in the presence of pyrocatechol was determined spectrometrically by monitoring the increase of the o-benzoquinone characteristic absorption band at 25,000 cm−1 with respect to time in DMF saturated with molecular oxygen. The kinetic parameters Vmax (2.8×10−3 M s−1) and KM (1.4×10−3 mm) have been determined by Michaelis–Menten method. Electrochemistry of the dinuclear Cu(II) complex has been studied in the
presence of molecular oxygen with pyrocatechol and without pyrocatechol at a scan rate of 0.1 V s−1 by cyclic voltammetry. On addition of pyrocatechol, complex shows a shift in Epc, Epa and E1/2 values indicating the oxidation of substrate (pyrocatechol). 相似文献
2.
The electrochemical behaviour of the anticancer herbal drug shikonin was investigated at glassy carbon electrode in 0.16 M
HAc-NaAc (20% ethanol, pH 3.98) buffer solution using cyclic voltammetry, square-wave voltammetry and chronocoulometry. Shikonin
gives a pair of quasi-reversible redox peaks at potentials of E
pc = 0.698 V and E
pa =0.632 V by absorption-controlled process at a scan rate of 100 mV/s. The electrode process dynamics parameters (saturated
adsorptive amount Γ, charge transfer coefficient α, and apparent rate constant K
s) and reaction mechanism were also investigated with result of two electrons and two hydrogen ions participating in electrode
reaction. The experimental conditions were optimized for the determination of shikonin and the square-wave anodic peak currents
were linearly related to the shikonin concentrations in the range from 2.08 × 10−8 to 1.82 × 10−6 M with correlation coefficient of 0.998 and detection limit of 7.8 × 10−9 M. Using the established method without pretreatment and pre-separation, shikonin in herbal drug Gromwell Root was determined
with satisfactory result. 相似文献
3.
Maurício Cavicchioli Antonio Carlos Massabni Luciana Rebelo Guilherme Eduardo Ernesto Castellano Armando Paduan-Filho Ana Maria da Costa Ferreira 《Transition Metal Chemistry》2007,32(3):355-361
Structural, electrochemical and spectroscopic data of a new dinuclear copper(II) complex with (±)-2-(p-methoxyphenoxy)propionic acid are reported. The complex {tetra-μ-[(±)-2-(p-methoxyphenoxy)propionato-O,O′]-bis(aqua)dicopper(II)} crystallizes in the monoclinic system, space group P21/n with a = 14.149(1) ?, b = 7.495(1) ?, c = 19.827(1) ?, β = 90.62(1) and Z = 4. X-ray diffraction data show that the two copper(II) ions are held together through four carboxylate bridges, coordinated
as equatorial ligands in square pyramidal geometry. The coordination sphere around each copper ion is completed by two water
molecules as axial ligands. Thermogravimetric data are consistent with such results. The ligand has an “L” type shape due
to the angle formed by the β-carbon of the propionic chain and the linked p-methoxyphenoxy group. This conformation contributes to the occurrence of a peculiar structure of the complex. The complex
retains its dinuclear nature when dissolved in acetonitrile, but it decomposes into the corresponding mononuclear species
if dissolved in ethanol, according to the EPR measurements. Further, cyclic voltammograms of the complex in acetonitrile show
that the dinuclear species maintains the same structure, in agreement with the EPR data in this solvent. The voltammogram
shows two irreversible reduction waves at E
pc = −0.73 and −1.04 V vs. Ag/AgCl assigned to the Cu(II)/Cu(I) and Cu(I)/Cu° redox couples, respectively, and two successive oxidation waves at E
pa =− 0.01 and +1.41 V vs. Ag/AgCl, assigned to the Cu°/Cu(I) and Cu(I)/Cu(II) redox couples, respectively, in addition to the oxidation waves of the
carboxylate ligand. 相似文献
4.
Y. Ding F. Wang Z. J. Ku L. S. Wang Q. R. Wang 《Russian Journal of Coordination Chemistry》2009,35(5):360-366
The mono- and binuclear complexes Ni(Salen) (I) and Ni2(Salen)2 (II) (H2Salen = N,N′-bis(salicylidene)ethane-1,2-diamine), have been synthesized and structurally characterized by single-crystal X-ray diffraction
studies. The X-ray structural analyses show that the metal center of complex I is mononuclear and tetracoordinate with a distorted
tetrahedron, whereas the metal-centered complex II is binuclear and pentacoordinate with rectangular pyramid geometries, respectively.
The electrochemical studies evidenced for the mononuclear Ni(II) complex shows one quasireversible reduction potential at
−0.80 V (E
pc
) and the binuclear Ni(II) complex shows a reduction potential at −0.90 V (E
pc
) in the cathodic region.
The article is published in the original. 相似文献
5.
A. Bieguñki A. Frydrychewicz M. Osial K. Jackowska 《Russian Journal of Electrochemistry》2010,46(11):1297-1305
In this work we examined the electrochemical properties of poly(indole-5-carboxylic acid), PIn5COOH. The polymer was produced by electrochemical polymerisation using cyclic voltammetry (CV). It was shown that PIn5COOH is electroactive in aqueous solutions showing two redox processes in acidic solution and one redox process in solutions
with pH > 4. The oxidation of catechol (CT) on Pt/In5COOH modified electrodes was investigated by cyclic voltammetry (CV) and rotating disc electrode (RDE) voltammetry. It was
established that CT was oxidised only after the oxidation of polymer film was initiated and that polymer significantly enhanced
the oxidation and reduction peak currents in comparison with bare Pt electrode. The variation of peak currents (i
pa, i
pc) as a function of CT concentration was found to be linear up to 6 mM. Experiments with a rotating disk electrode show that
the oxidation reaction of catechol occures not only at the polymer/electrolyte interface but also in the polymer film. 相似文献
6.
A catalytic adsorptive stripping voltammetric method for the determination of copper(II) on a carbon paste electrode (PCE)
in an alizarin red S (ARS)-K2S2O8 system is proposed. In this method, copper(II) is effectively enriched by both the formation and adsorption of a copper(II)-ARS
complex on the PCE, and is determined by catalytic stripping voltammetry. The catalytic enhancement of the cathodic stripping
current of the Cu(II) in the complex results from a redox cycle consisting of electrochemical reduction of Cu(II) ion in the
complex and subsequent chemical oxidation of the Cu(II) reduction product by persulfate, which reduces the contamination of
the working electrode from Cu deposition and also improves analytical sensitivity. In Britton-Robinson buffer (pH 4.56±0.1)
containing 3.6×10−5 mol L−1 ARS and 1.6×10−3 mol L−1 K2S2O8, with 180 s of accumulation at −0.2 V, the second-order derivative peak current of the catalytic stripping wave was proportional
to the copper(II) concentration in the range of 8.0×10−10 to ∼3.0×10−8 mol L−1. The detection limit was 1.6×10−10 mol L−1. The proposed method was evaluated by analyzing copper in water and soil. 相似文献
7.
Hadi Beitollahi Mohammad Mazloum Ardakani Hossein Naeimi Bahram Ganjipour 《Journal of Solid State Electrochemistry》2009,13(3):353-363
The preparation and electrochemical characterization of a carbon nanotube paste electrode modified with 2,2′-[1,2-ethanediylbis
(nitriloethylidyne)]-bis-hydroquinone, referred to as EBNBH, was investigated. The EBNBH carbon nanotube paste electrode (EBNBHCNPE)
displayed one pair of reversible peaks at E
pa = 0.18 V and E
pc = 0.115 V vs Ag/AgCl. Half wave potential (E
1/2) and ΔE
p were 0.148 and 0.065 V vs Ag/AgCl, respectively. The electrocatalytic oxidation of ascorbic acid (AA) has been studied on
EBNBHCNPE, using cyclic voltammetry, differential pulse voltammetry and chronoamperometry techniques. It has been shown that
the oxidation of AA occurs at a potential where oxidation is not observed at the unmodified carbon paste electrode. The heterogeneous
rate constant for oxidation of AA at the EBNBHCNPE was also determined and found to be about 1.07 × 10−3 cm s−1. The diffusion coefficient of AA was also estimated as 5.66 × 10−6 cm2 s−1 for the experimental conditions, using chronoamperometry. Also, this modified electrode presented the property of electrocatalysing
the oxidation of AA and uric acid (UA) at 0.18 and 0.35 V vs Ag/AgCl, respectively. The separations of anodic peak potentials
of AA and UA reached 0.17 V. Using differential pulse voltammetry, the calibration curves for AA and UA were obtained over
the range of 0.1–800 μM and 20–700 μM, respectively. With good selectivity and sensitivity, the present method provides a
simple method for selective detection of AA and UA in biological samples. 相似文献
8.
Shanmugam Sreedaran Kuppannan Shanmuga Bharathi Aziz Kalilur Rahiman Raju Prabu Raman Jagadesh Nanjian Raaman Vengidusamy Narayanan 《Transition Metal Chemistry》2009,34(1):33-41
A series of trinuclear Cu(II) complexes have been prepared by Schiff base condensation of 1,8-[bis(3-formyl-2-hydroxy-5-methyl)benzyl]-l,4,8,11-tetraazacyclotetradecane
and 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclotetradecane with aromatic and aliphatic diamines, Cu(II)
perchlorate and triethylamine. The complexes were characterized by elemental and spectroscopic analysis. Electrochemical studies
of the complexes in DMF solution show three irreversible one-electron reduction processes around Epc
1 = −0.73 to −0.98 V, Epc
2 = −0.91 to −1.20 V and Epc
3 = −1.21 to −1.33 V. ESR spectra and magnetic moments of the trinuclear Cu(II) complexes show the presence of antiferromagnetic
coupling. The rate constants for hydrolysis of 4-nitrophenylphosphate by the Cu(II) complexes are in the range of 3.33 × 10−2 to 7.58 × 10−2 min−1. The rate constants for the catecholase activity of the complexes fall in the range of 2.67 × 10−2 to 7.56 × 10−2 min−1. All the complexes were screened for antifungal and antibacterial activity. 相似文献
9.
The electrochemical behaviour of lanthanum fluoride dissolved in molten lithium fluoride and in eutectic mixture LiF-CaF2 was investigated by cyclic voltammetry and laboratory electrolysis. The cyclic voltammetry experiments were carried out at
900°C and 800°C, respectively, in a graphite crucible (counter electrode). Several types of working electrodes (Mo, W, Ni
and Cu) were used. Ni/Ni(II) was used as a reference electrode. Laboratory electrolysis was carried out in the system LiF-CaF2-LaF3 at 800°C in galvanostatic (j
c = −0.21 A cm−2) and potentiostatic (E = 0.87 V) regimes. In both cases, nickel served as the cathode and graphite as the anode. It was found that no new separate
reduction peak occurred on the molybdenum or tungsten electrodes in the investigated systems. When copper or nickel electrodes
were used, new peaks corresponding to the reduction of lanthanum(III) to lanthanum metal appeared. This can be explained by
the formation of alloys or intermetallic compounds of lanthanum with copper or nickel. X-ray microanalysis showed that lanthanum
was electrodeposited together with calcium under formation of intermetallic compounds with the electrode materials in the
galvanostatic regime. In the potentiostatic regime, mainly lanthanum was deposited, which enabled its separation. 相似文献
10.
A. A. Shaikh M. Begum A. H. Khan M. Q. Ehsan 《Russian Journal of Electrochemistry》2006,42(6):620-625
Electrochemical redox behavior of Fe-vit B6 complex is investigated in HEPES buffer in the pH range 5.1–13.1 using cyclic voltammetry. Well-defined anodic and cathodic
peaks are observed in the voltammograms at pH 13.1. At pH 8.0, only one cathodic peak and at pH 5.1, only one anodic peak
are found. At all the pH values, the peak potential separation is much higher than that of a reversible electrochemical reaction.
The peak current ratio (i
pa/i
pc) is less than unity and decreases with the scan rate.
Published in Russian in Elektrokhimiya, 2006, Vol. 42, No. 6, pp. 691–697.
The text was submitted by the authors in English. 相似文献
11.
Jing Chen Tieming Zhang Chunguang Gao Yongxiang Zhao 《Journal of Sol-Gel Science and Technology》2010,55(3):293-298
Ferrocene-bridged polysilsesquioxanes film electrodes were prepared via depositing the sols formed by hydrolysis of 1,1′-bis[(2-triethoxylsilyl)ethyl]ferrocene
(BTEF) or co-hydrolysis of poly(vinylalcohol) (PVA) with BTEF or tetraethoxysilane (TEOS) with BTEF onto glassy carbon electrode
(GCE) surface. The electrochemical behavior of the modified electrodes were characterized by cyclic voltammogram (CV) in aqueous
solution. The BTEF film, BTEF/PVA film and BTEF/TEOS film all exhibit a redox wave at E0’ are 0.504, 0.326, 0.318 V, with the peak potential separation (ΔE) are 0.132, 0.042, 0.028 V, and the value of ipa/ipc are 1.8097, 1.007, 1.064 (vs. SCE), respectively. This suggests that BTEF/PVA film and BTEF/TEOS film have a good reversible
redox behavior and the redox peak is corresponded to a one-electron reduction and oxidation process. After successive 50 time’s
cyclic voltammetric, there is no peak potential shift, and the peak current only decreased 5.58, 4.95%, respectively. BTEF/PVA
film has better hydrophilicity and shows a more perfect electrocatalytic activity in the oxidation of H2A than that of the BTEF/TEOS film. The catalytic peak current has a linear relationship with the concentration of H2A in the range of 1.0 × 10−5~1.0 × 10−3 M. 相似文献
12.
Merlin C. E. Bandeira Joseph A. Crayston Norberto S. Gonçalves Lúcia K. Noda Andrew Glidle César V. Franco 《Journal of Solid State Electrochemistry》2007,11(2):231-239
The electropolymerization of trans-[RuCl2(vpy)4] (vpy=4-vinylpyridine) on Au or Pt electrodes was studied by cyclic voltammetry, electrochemical quartz crystal microbalance (EQCM) technique, and Raman spectroscopy. Cyclic voltammetry of the monomer at a microelectrode shows the typical Ru(III/II) and Ru(IV/III) waves, together with the vinyl reduction waves at −1.5 and −2.45 V and adsorption wave at −0.8 V. Electrodeposition on EQCM technique performed under potential cycling between −0.9 and −2.0 V revealed that the polymerization proceeded well in advance of the vinyl reduction waves. At potentials more positive than −0.9 V, soluble oligomers were deposited irreversibly on the electrode during the oxidative sweep. The film also showed reversible mass changes due to the oxidation and accompanying ingress of charge-balancing anions and solvent into the film. In contrast, potentiostatic growth of the polymer at −1.6 V was slower because the oligomeric material was lost completely from the electrode. Unreacted vinyl groups were detected by in situ Raman spectroscopy for films grown at −0.7, −0.9, and −1.6 V but were absent when the polymerization was carried out at −2.9 V vs Ag/Ag+. 相似文献
13.
Ismail Yilmaz 《Transition Metal Chemistry》2008,33(2):259-265
The new asymmetric, fluorescent Schiff-base ligand, N-(pyrene)-salicylaldimine (L), and its copper complex having an ONNO donor set, [Cu(L)
2
], were synthesized and characterized using elemental analysis, IR, UV-vis, 1H and 13C-NMR spectroscopies. Their electrochemical and spectroelectrochemical behaviors were investigated in a detail by using cyclic
voltammetry (CV), square wave voltammetry (SWV), in-situ UV-vis, and fluorescence spectroelectrochemistry. The formation of
the complex was monitored by the in-situ fluorescence technique based on the quenching of the fluorescence-probe ligand. Electrochemical
studies showed that L exhibits a single irreversible reduction process. However, the SWV indicated that this process was not totally irreversible
in the time scale of the measurement. The cathodic peak potential of the reduction process occurred at E
pc = −1.35 V vs Ag/AgCl (scan rate: 0.025 Vs−1). On the other hand, [Cu(L)
2
] showed one quasi-reversible one-electron reduction process in the scan rates of 0.025–0.50 Vs−1, which was assigned to metal-based one-electron process; [Cu(2+)(L)2] + e− → [Cu(+)(L)2]−. The value of half-wave potential (E
1/2) of the reduction process was −0.54 V vs Ag/AgCl (scan rate: 0.025 Vs−1). The time-resolved spectra showed, when the potential (E
app = −1.60 V) was applied in a thin-layer cell, that the main and shoulder bands of (L) at 385, 336, and 407 nm almost disappeared and a new band at 443 nm with a shoulder formed during the reduction process. No
change was observed on the final spectrum of the totally reduced ligand for long period under nitrogen atmosphere, which indicated
that the singly reduced species remained stable and was not accompanied by a chemical reaction in the time scale of the spectroelectrochemical
measurement. The spectral changes during the reduction process of [Cu(L)
2
] confirmed the metal-centered reduction process. The fluorescence intensity of L decreased during the reduction process in the thin-layer cell, as result of the perturbation of the conjugated system of
the reduced species. 相似文献
14.
Edward Szlyk Stanislaw Biniak Erik Larsen 《Journal of Solid State Electrochemistry》2001,5(3):221-226
The electrochemical properties and catalytic activity of a Co(II) complex with the optically active Schiff base derived from
(1R,2R)-(–)-cyclohexanediamine and salicylaldehyde have been studied in non-aqueous solutions. When dissolved in deoxygenated non-aqueous
solutions, the complex exhibits reversible redox properties for the Co(II)/Co(III) couple. Electrochemical reduction of oxygen
and oxidation of cobalt(II) was observed on cyclic voltammograms of solutions containing both dioxygen and the Schiff base-cobalt(II)
complex. An anodically formed film on a platinum electrode, studied by means of X-ray photoelectron spectroscopy, revealed
the presence of the oxidized Co(III) species. Cyclic voltammetry of oxygenated solutions examined after a period of time indicates
an electrochemical activity of coordinated superoxo/peroxo species in the 0.7–1.1 V potential range. In the presence of 4-methyl-1-cyclohexene
the cyclic voltammetry curves reveal changes similar to those caused by the removal of oxygen. The GC-MS technique was used
to identify some of the products formed by the catalytic oxidation of cyclohexene and 4-methyl-1-cyclohexene.
Electronic Publication 相似文献
15.
Mohammad Mazloum Ardakani Payam Ebrahimi Karami Hamid Reza Zare Mohammad Hamzehloo 《Mikrochimica acta》2007,159(1-2):165-173
The preparation and electrochemical characterization of glassy carbon electrodes modified with plumbagin were investigated
by employing cyclic voltammetry, chronoamperometry and rotating disc electrode techniques. The cyclic voltammograms of the
electroreduction of oxygen showed an enhanced current peak at approximately −0.289 V in air-saturated phosphate buffer pH
= 7 and scan rate 10 mV s−1. The thermodynamic and kinetic parameters of the reduction of oxygen at glassy carbon have been evaluated using cyclic voltammetry.
The experimental parameters were optimized and the mechanism of the catalytic process was discussed. The obtained values of
E°′ (V vs. Ag/AgCl), the apparent electron transfer rate constant ks (s−1), heterogeneous rate constant for the reduction of O2 at the surface of the modified electrode kh (M−1 s−1) and α (charge transfer coefficient of oxygen) were as follows: −0.146, 23.4, 9.9 × 103 and 0.57, respectively. In addition, plumbagin exhibited strong catalytic activity toward the reduction of H2O2. 相似文献
16.
Mojtaba Shamsipur Mostafa Najafi Mohammad‐Reza Milani Hosseini Hashem Sharghi 《Electroanalysis》2007,19(16):1661-1667
A carbon paste modified electrode with a new cobalt(III) Schiff's base complex (CPME) and its application to electrocatalytic activity for dioxygen reduction is developed. The electrochemical behavior and stability of the CPME as well as the two‐electron reduction of O2 at the electrode were investigated using cyclic voltammetry, chronoamperometry and rotating disk electrode methods. At the CPME, the reduction of dioxygen to hydrogen peroxide occurs at potentials where it is not observed at a bare carbon paste electrode. The CPME exhibited potent and persistent electrocatalysis for O2 reduction in acetate buffer solutions of pH 4.0 with an overpotential of about 800 mV lower than unmodified CPE and drastic increase in the peak current. The heterogeneous rate constant for the reduction of O2 at the surface of CPME was determined by hydrodynamic voltammetry using the Koutecky–Levich plot. A possible catalytic mechanism is proposed and discussed. 相似文献
17.
Shen-Ming Chen Ying-Lu Chen R. Thangamuthu 《Journal of Solid State Electrochemistry》2007,11(10):1441-1448
Stable electroactive iron tetra(o-aminophenyl)porphyrin (FeTAPP) films are prepared by electropolymerization from aqueous solution by cycling the electrode
potential between −0.4 and 1.0 V vs Ag/AgCl at 0.1 V s−1. The cyclic voltammetric response indicates that polymerization takes place after the oxidation of amino groups, and the
films could be produced on glassy carbon (GC) and gold electrodes. The film growth of poly(FeTAPP) was monitored by using
cyclic voltammetry and electrochemical quartz crystal microbalance. The cyclic voltammetric features of Fe(III)/Fe(II) redox
couple in the film resembles that of surface confined redox species. The electrochemical response of the modified electrode
was found to be dependent on the pH of the contacting solution with a negative shift of 57 mV/pH. The electrocatalytic behavior
of poly(FeTAPP) film-modified electrode was investigated towards reduction of hydrogen peroxide, molecular oxygen, and chloroacetic
acids (mono-, di-, and tri-). The reduction of hydrogen peroxide, molecular oxygen, and dichloroacetic acid occurred at less
negative potential on poly(FeTAPP) film compared to bare GC electrode. Particularly, the overpotential of hydrogen peroxide
was reduced substantially. The O2 reduction proceeds through direct four-electron reduction mechanism. 相似文献
18.
Tsung-Hsuan Tsai Tse-Wei Chen Shen-Ming Chen Ramiah Sarawathi 《Russian Journal of Electrochemistry》2012,48(3):291-301
The NiHCF-PEDOT, CuHCF-PEDOT and MnHCF-PEDOT films were prepared on glassy carbon electrode (GCE) by multiple scan cyclic
voltammetry and characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron
microscope (SEM) techniques. The advantages of these films are demonstrated for selectivity detection of ascorbic acid using
cyclic voltammetry and amperometric method. Interestingly, the NiHCF-PEDOT and CuHCF-PEDOT modified electrodes exhibited a
wide linear response range (5 × 10−6−3 × 10−4 M, R
2 = 0.9973 and 1.8 × 10−3−1.8 × 10−2 M, R
2 = 0.9924). The electrochemical sensors facilitated the oxidation of AA but not responded to other electroactive biomolecules
such as dopamine, uric acid, H2O2, glucose. The difference is MnHCF-PEDOT/GCE that no response to AA. In addition, the NiHCF-PEDOT and CuHCF-PEDOT modified
electrodes exhibited a distinct advantage of simple preparation, specificity, stability and reproducibility. 相似文献
19.
The preparation, electrochemical and catalytic behaviour of glassy carbon electrodes modified by anthra-9,10-quinone, its amino derivatives and dyes were investigated. The stability of the modified electrodes was studied by cyclic voltammetry in acidic and neutral media. The electrocatalytic ability of the modified electrodes for the reduction of dioxygen to hydrogen peroxide was examined by cyclic voltammetry, chronoamperometry and chronocoulometry techniques. The influence of pH on the electrochemical and catalytic behaviour was studied and pH 5.0–8.0 was chosen as the optimum working pH by comparing the shift in oxygen reduction potential. The anthraquinone-adsorbed glassy carbon electrodes possess excellent electrocatalytic abilities for dioxygen reduction with overpotential ranging from 280 to 560 mV lower than that at a plain glassy carbon electrode. Hydrodynamic voltammetric studies were performed to determine the heterogeneous rate constants for the reduction of O2 at the surface of the modified electrodes, mass specific activity of the anthraquinones used and the apparent diffusion coefficient of O2 in buffered aqueous O2-saturated solutions. Studies showed the involvement of two electrons in dioxygen reduction. 相似文献
20.
Multiwalled carbon nanotubes-polymeric alizarin film modified electrode was made. The electrochemical behavior of levofloxacin
hydrochloride on modified electrode was studied with cyclic voltammetry, linear sweep voltammetry and chronopotentiometry.
The results indicated that the electrical oxidation of levofloxacin hydrochloride on MWNT-PAR electrode, in HAc-NaAc buffer
solution at pH 4.2 was irreversible and was controlled by diffusion. Some important parameters m, n, D, E
D, ΔS
rc and ΔH
rc of the electrochemical process were evaluated. Good linearity relationship between peak current and its concentration in
the range of 5.0 × 10−6–1.0 × 10−4 mol l−1 was found, of which the equation was I
p(A) = −5.456 × 10−6 0.2667c, the correlative coefficient r = −0.9976 and detect limitation was 4.0 × 10−7 mol l−1. The recovery of levofloxacin hydrochloride in levofloxacin hydrochloride injection was between 94.6 and 104.7%. 相似文献