Electrochemical determination of cadmium(II) using dithizone assisted ion transfer and eletrolyte dropping electrode

2011 ◽  
Vol 76 (10) ◽  
pp. 1177-1186
Author(s):  
Feifei Shu ◽  
Shaoai Xie ◽  
Jinping Jia
Keyword(s):  
Square Wave Voltammetry ◽  
Methyl Isobutyl Ketone ◽  
Electrochemical Determination ◽  
Ion Transfer ◽  
Isobutyl Ketone ◽  
Ligand Complex ◽  
Wave Voltammetry ◽  
Maximum Value ◽  
Relative Standard

The transfer of Cd(II) assisted by dithizone (DzH2) present in methyl isobutyl ketone (MIBK) at water–MIBK interface was systematically investigated by novel electrolyte dropping electrode (EDE) using cyclic voltammetry (CV) and square wave voltammetry (SWV). The protonation of DzH2 at polarized liquid–liquid interface was studied. The stoichiometry of resulting metal ligand complex was formulated. Transfer peak current was proportional to the bulk concentration of the Cd(II) varied between 1 μM to 0.1 mM and the maximum value of relative standard deviation was about 3.17%. The presented procedure was successfully applied for determination of Cd(II) in real samples.

Determination of lead(II) by online novel electrolyte dropping electrode using 1,10-phenanthroline in flow injection system

2011 ◽  
Vol 76 (2) ◽  
pp. 115-129
Author(s):  
Feifei Shu ◽  
Shaoai Xie ◽  
Jinping Jia
Keyword(s):  
Square Wave Voltammetry ◽  
Injection System ◽  
Isobutyl Ketone ◽  
Ligand Complex ◽  
Wave Voltammetry ◽  
Half Wave ◽  
Long Time ◽  
Flow Injection System ◽  
Novel Method

The transfer of Pb(II) facilitated by 1,10-phenanthroline (phen) presented in the methyl isobutyl ketone (MIBK) across the polarized water|MIBK interface was systematically investigated by novel electrolyte dropping electrode using cyclic voltammetry and square wave voltammetry. The protonation of 1,10-phenanthroline in polarized water|MIBK interface was explored. The dependence of the half-wave potential on PbCl2 and phen concentration was investigated and the stoichiometry of resulting metal ligand complex was formulated. Different concentrations of PbCl2 was determined online and the transfer peak current was proportional to the bulk concentration of the Pb2+ varied between 8 μM to 0.5 mM and 0.5 to 1 mM, and the linear regression coefficients were 0.9953 and 0.9995, respectively. The standard deviations (RSD) were 4.33, 5.80, 4.13, 3.88, 2.23, 3.39, 1.38, 2.42, 2.00, 2.73 and 2.37% for 8 times successive determinations of Pb2+ for the concentrations of 0.008, 0.05, 0.1, 0.2, 0.3, 0.35, 0.4, 0.5, 0.8, 0.9 and 1 mM, respectively. The long time stability of the electrolyte dropping electrode was tested and the result showed that this novel method was simple, rapid and efficient.

Development of an avidin sensor based on the poly(methoxy amino-β-styryl terthiophene)-coated glassy carbon electrode

2012 ◽  
Vol 90 (3) ◽  
pp. 271-277 ◽  
Author(s):  
Hakim Mehenni
Keyword(s):  
Conducting Polymer ◽  
Square Wave Voltammetry ◽  
Saline Solution ◽  
Carbon Electrode ◽  
Ion Transfer ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Coated Electrode ◽  
Phosphate Buffered Saline

In this study, a simple and direct biosensor was proposed, which was based on biotin immobilized onto a conducting polymer-coated electrode, for the determination of avidin, a highly stable glycoprotein found in egg whites. Biotin was immobilized onto the electrode by covalent coupling to the primary amine group on poly-3′-(2-methoxy-5-amino-β-styryl)-(2,2′:5′,2″-terthiophene) (PMAST), and the biotin–avidin interaction was monitored by square-wave voltammetry. Incubation of the PMAST/biotin-modified coated electrode with avidin in a phosphate-buffered saline solution caused a significant change to its square-wave voltammogram, which was explained by the binding of avidin by biotin, and resulted in restricted ion transfer to and from the conducting polymer. This change was then utilized to determine avidin. Importantly, we found a linear relationship for the avidin sensor in the range of 4 × 10−14 to 3 × 10−4 mol/L, and the detection limit was determined to be approximately 10−14 mol/L.

scholarly journals The Use of Boron-Doped Diamond Electrode for the Determination of Selected Biocides in Water Samples

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1595 ◽  
Author(s):  
Mielech-Łukasiewicz ◽  
Starczewska
Keyword(s):  
Water Samples ◽  
Square Wave Voltammetry ◽  
Boron Doped Diamond ◽  
Diamond Electrode ◽  
Boron Doped ◽  
Wave Voltammetry ◽  
Boron Doped Diamond Electrode ◽  
Relative Standard ◽  
Cyclic Voltammetry Method

In recent years, the remains of chemical substances in water environments, referred to as emerging organic contaminations, have been more and more often studied by analysts. This work shows the possibility of using a boron-doped diamond electrode to determine low concentration levels of remains of pharmaceuticals in environmental samples. The study focused on selected biocides from the group of azole fungicides (itraconazole and posaconazole) and was performed using quick and sensitive electrochemical methods. The cyclic voltammetry method was used in order to determine the properties of these compounds, whereas analytical characterization was performed using square wave voltammetry. The work involved the specification of the optimum electrooxidation conditions of the selected fungicides, their comparative characterization, and the development of a new, sensitive methods of itraconazole and posaconazole assay. The proposed procedures allowed us to determine itraconazole in the range from 7.9 × 10−8 to 1.2 × 10−6 moL·L−1 and posaconazole in the range from 5.7 × 10−8 to 8.44 × 10−7 moL·L−1. The relative standard deviation of the measurements did not exceed 5.85%. The developed procedures were successfully used to determine itraconazole and posaconazole concentration in water samples and the assay recovery was between 93.5% and 102.8%.

Spectrophotometric Determination of Boron in Boronated Fertilizers

1975 ◽  
Vol 58 (5) ◽  
pp. 920-922
Author(s):  
Terry E Neuner ◽  
Edward E Pickett ◽  
Charles W Gehrke
Keyword(s):  
Standard Deviation ◽  
Acid Solution ◽  
Relative Standard Deviation ◽  
Methyl Isobutyl Ketone ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Average Recovery ◽  
Relative Standard ◽  
Hydrogen Flame

Abstract Acid-soluble boron in fertilizers is complexed in acid solution with 2-ethyl-l,3-hexanediol and extracted into methyl isobutyl ketone. The extract is nebulized into an air-hydrogen flame and the intensity of emission of the BO2 molecule is measured at 518 inn. The method is convenient and inexpensive and provides detection limits of 0.1 ppm. The method was tested on 6 fertilizer samples with the relative standard deviation varying from 5.6% on a 0.053% (w/w) sample to 2.6% on a 7.81% (w/w) sample. The recovery of added boron ranged from 94.5 to 104.2% with an average recovery of 99.7%.

scholarly journals APPLICATION OF THE BISMUTH FILM ELECTRODE FOR THE DETERMINATION OF SELENIUM IN VITAMINIC COMPLEX BY SQUARE WAVE VOLTAMMETRY

2010 ◽  
Vol 07 (13) ◽  
pp. 6-15
Author(s):  
Joyce Nunes BIANCHIN ◽  
Marcel Silveira dos SANTOS ◽  
Almir SPINELLI
Keyword(s):  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Copper Electrode ◽  
Analytical Sensitivity ◽  
Bismuth Film ◽  
Analytical Methodology ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Relative Standard

This work was developed an analytical methodology for determination of selenium in samples of vitaminic complex using the square wave voltammetry (SWV). The analysis were performed with a copper electrode modified with bismuth film deposited by applying a potential of -400 mV for 60 seconds in a solution containing HCl 0.2 mol L-1, 20 g L-1 and 500 µg L-1 of Bi(III). The variables: time and conditioning potential were optimized by SWV for the formation of the bismuth film, after that, the variables that affect the analytical sensitivity for the reduction of Se (IV): frequency, increment and high of pulse were also optimized. The linearity of the method ranged from 90 – 1180 µg L-1. Limit of detection of 26,4 µg L-1, quantification limit of 87,9 µg L-1. Analytical frequency of 30 samples/hour. The method showed excellent precision, calculated as the relative standard deviation (RSD%) (n = 5) using spiked solution of 150 µg L-1. The concentration of selenium found in the sample of the vitaminic complex was 24 µg/tablet. A study of recovery was performed resulting in 92%.

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