scholarly journals Voltammetric Determination Of Pt(IV) Using 5-Hydroxyimino-4- Imino-1,3-Thiazolidine-2-One

2019 ◽  
Vol 14 (3) ◽  
pp. 130-139
Author(s):  
P.V. Rydchuk ◽  
O.S. Tymoshuk ◽  
L.V. Oleksiv ◽  
T.I. Chaban ◽  
V.S. Matiychuk
Keyword(s):  
Background Electrolyte ◽  
Organic Reagent ◽  
Voltammetric Determination ◽  
Real Sample ◽  
Optimal Conditions ◽  
Exhaust Gases ◽  
Model Solutions ◽  
Catalytic Hydrogen ◽  
Sensitive Method

5-Hydroxyimino-4-imino-1,3-thiazolidine-2-one has been suggested as a new organic reagent for the voltammetric determination of platinum. The optimal conditions of Pt(IV) voltammetric determination using 5-hydroxyimino-4- imino-1,3-thiazolidine-2-one on the peak of catalytic hydrogen currents have been determined: the background electrolyte is 0.3 M NaCl, pH of the solution is 2.0, 50-fold concentration excess of organic reagent. The sensitive method of Pt(IV) voltammetric determination was developed (LOD = 4.1·10-9 М). The range of determinable contents covers two concentration orders. The selectivity of the developed methods have been studied towards concomitant metals ions. The accuracy of the developed method has been tested on model solutions using “added-found” method. The method has been approved during the analysis of a real sample, viz. the catalyst for oxidation of exhaust gases of the car “Chevrolet”.

scholarly journals Voltammetric Determination of Pd(II) Using 5-Hydroxyimino-4-imino-1,3-thiazolidin-2-one after a Thermal Activation of the Interaction

2021 ◽  
Vol 15 (3) ◽  
pp. 324-329
Author(s):  
Petro Rydchuk ◽  
◽  
Oksana Labyk ◽  
Lesya Oleksiv ◽  
Oleksandr Tymoshuk ◽  
...  
Keyword(s):  
Thermal Activation ◽  
Limit Of Detection ◽  
Supporting Electrolyte ◽  
Voltammetric Determination ◽  
Real Sample ◽  
Optimal Conditions ◽  
Voltammetric Method ◽  
The Real ◽  
Ph Range

The interaction of Pd(II) with 5-hydroxyimino-4-imino-1,3-thiazolidin-2-one (HITO) was investigated over the pH range of 1.0–10.0. Optimal conditions for the voltammetric determination of Pd(II) were established. A new voltammetric method of Pd(II) determination by the peak of complex using NaCl as a supporting electrolyte at pH 2.0 was developed with the limit of detection 2.0∙10-7 M. The study of the method’s selectivity was presented in the work. The correctness of the method was confirmed by the analysis of model solutions and the real sample (resistor SP5-35B).

scholarly journals Micellar Electrokinetic Chromatographic Study of the Separation of an Aromatase Inhibitor and a Tryciclic Antidepressant in the Breast Cancer Treatment

2008 ◽  
Vol 3 ◽  
pp. ACI.S939 ◽  
Author(s):  
J. Rodríguez Flores ◽  
A.M. Contento Salcedo ◽  
L. Muñoz Fernández
Keyword(s):  
Micellar Electrokinetic Chromatography ◽  
Solid Phase ◽  
Background Electrolyte ◽  
Kinetic Studies ◽  
Breast Cancer Treatment ◽  
Chromatographic Study ◽  
Optimal Conditions ◽  
Sodium Dodecylsulphate ◽  
Experimental Parameters

Micellar electrokinetic chromatography (MEKC) was investigated for the simultaneous determination of letrozole, imipramine and their metabolites in human urine samples over a concentration range of therapeutic interest. Experimental parameters such as pH of the running electrolyte, sodium dodecylsulphate (SDS) concentration, borate concentration, voltage, etc were investigated. Under optimal conditions of 25 mM SDS, 15 mM borate buffer (pH 9.2), 15% 2-propanol, as background electrolyte; 28 kV and 40 °C, as voltage and cartridge temperature, respectively; resolution between the peaks was greater than 1.7. Before the determination, a solid phase extraction (SPE) procedure with a C18 cartridge was optimized. Good linearity, accuracy, precision, robustness and ruggedness were achieved and detection limits of 12.5 ng/mL for letrozole and its metabolite and 37.5 ng/mL, were obtained for imipramine and their metabolites. Real determinations of these analytes in two patient urines were carried out. Sensitivity achieved in this method is sufficient to perform kinetic studies in humans.

scholarly journals VOLTAMMETRIC DETERMINATION OF ETHYL NITRITE

2019 ◽  
Vol 62 (12) ◽  
pp. 9-12
Author(s):  
Valentina A. Popova ◽  
Anna A. Krivosheina ◽  
Elena I. Korotkova
Keyword(s):  
Graphite Electrode ◽  
Background Electrolyte ◽  
High Sensitivity ◽  
Physicochemical Characteristics ◽  
Voltammetric Determination ◽  
Nonlinear Dependence ◽  
Buffer Solution ◽  
Scan Rate ◽  
Ethyl Nitrite

The possibility of voltammetric determination of ethyl nitrite on a graphite electrode modified with carbon ink was investigated and described in this study. The physicochemical characteristics of the oxidation process of the compound were studied. A nonlinear dependence of the oxidation current of С2Н5ONO on the scan rate was obtained. This indicates the absence of adsorption on the surface of the electrode. The dependence of the peak current on v 1/2 and the dependence of the potential of the ethylnitrite oxidation peak on log(v 1/2) are linear, indicating that the process is irreversible. The electrochemical behavior of ethyl nitrite on a graphite electrode modified with carbon ink, using voltammetry, has been studied. The effect of various factors on the anode signal of alkylnirite was shown: pH, time and potential of accumulation, potential scan rate. Oxidation of C2H5ONO strongly depends on the pH of the background electrolyte and when the pH is shifted to a neutral and alkaline medium, the current decreases as the number of protons is not sufficient to oxidize nitrite. The maximum current for the electro-oxidation of ethyl nitrite was obtained in an acidic environment. A universal Britton-Robinson buffer solution with pH 4.02 was used as a background electrolyte. The working conditions for the determination of ethyl nitrite in model media were selected: pH 4.02; Eacc 0.4 V; tacc 4.0 s; v = 100 mV∙s-1. The linear regression equation of ethyl nitrite was obtained at a potential of 1 V, in the range of concentrations of 1-10∙10-6 mol∙l-1. The detection limit was 3.8·10-7 mol∙l-1. Thus, a simple and rapid method for the determination of ethyl nitrite with high sensitivity has been developed.

The polarographic and voltammetric determination of the 4'-haloderivatives of N,N-dimethyl-4-aminoazobenzene

1989 ◽  
Vol 54 (6) ◽  
pp. 1549-1563 ◽  
Author(s):  
Jiří Barek ◽  
Helena Haladová-Bláhová ◽  
Jiří Zima
Keyword(s):  
Differential Pulse ◽  
Voltammetric Determination ◽  
Differential Pulse Polarography ◽  
Determination Limit ◽  
Polarographic Reduction ◽  
Hanging Mercury Drop Electrode ◽  
Optimal Conditions ◽  
Pulse Polarography ◽  
Mixed Water

The polarographic reduction of 4-haloderivatives of N,N-dimethyl-4-aminoazobenzene has been studied in mixed water-methanol medium, a mechanism has been proposed and optimal conditions have been found for determination of these substances by TAST polarography with a determination limit of about 1.10-6 mol l-1, by differential pulse polarography with a determination limit of about 1.10-7 mol l-1 and linear scan voltammetry with a determination limit of about 5.10-8 mol l-1. In the latter technique, the determined substance was accumulated by adsorption on the surface of a hanging mercury drop electrode to decrease the determination limit below 1.10-8 mol l-1.

Voltammetric determination of the metal complexing capacity in model solutions

1996 ◽  
Vol 53 (1-2) ◽  
pp. 121-129 ◽  
Author(s):  
D. Omanović ◽  
I. Pižeta ◽  
Ž. Peharec ◽  
M. Branica
Keyword(s):  
Voltammetric Determination ◽  
Complexing Capacity ◽  
Model Solutions

scholarly journals The Simultaneous Voltammetric Determination of Aflatoxins В1 and М1 on a Glassy-Carbon Electrode

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
G. B. Slepchenko ◽  
T. M. Gindullina ◽  
M. A. Gavrilova ◽  
A. Zh. Auelbekova
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Mutual Influence ◽  
Background Electrolyte ◽  
Analytical Signal ◽  
Stripping Voltammetry ◽  
Voltammetric Determination ◽  
Carbon Electrode ◽  
Aflatoxin B

For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins В1 and М1 on a glassy-carbon electrode has been shown. The influence of various factors (Еэ, τэ, w, and the nature of the background electrolyte) on the potential and magnitude of the oxidation current of mycotoxins has been estimated. Working conditions for voltammetric determination and reproducibility of analytical signals for two mycotoxins have been selected. The mutual influence of aflatoxins В1 and М1 on the value of analytical signals in their simultaneous presence has been studied. It has been found that, in the range of their detectable contents, the presence of aflatoxin В1 reduces the analytical signal of aflatoxin М1 by 45–50%, but the linearity of the calibration dependence is preserved. The content of aflatoxin М1 in determination of aflatoxin B1 does not exert a significant effect in the range of 10–15%. Based on the results obtained, a procedure has been proposed for determining the content of aflatoxins В1 and М1 in their joint presence in milk by voltammetry in the concentration ranges 2 × 10−3 ÷ 2 × 10−1 mg/dm3 and 2 × 10−4 ÷ 2 × 10−2 mg/dm3, respectively (Sr not more than 18%).

Determination of Plasminogen in Human Plasma by a Casein Method*

1965 ◽  
Vol 14 (03/04) ◽  
pp. 545-561 ◽  
Author(s):  
Ulla Hedner ◽  
Inga Marie Nilsson
Keyword(s):  
Liver Cirrhosis ◽  
Human Plasma ◽  
Normal Group ◽  
Optimal Conditions ◽  
Reference Curves ◽  
Plasmin Inhibitors ◽  
The Mean ◽  
Sensitive Method ◽  
Better Than

SummaryA modification of the casein method for determination of plasminogen in plasma has been devised.1. Urokinase instead of streptokinase was used for activation of plasminogen in order to eliminate the effect of any antistreptokinase antibodies in the plasma.2. A purified and stable plasmin preparation according to Wallén was used for preparing reference curves.3. The plasminogen activity of plasma was converted into arbitrary casein - olytic units (ACU) defined in such a way that 10 caseinolytic units gave an extinction of 0.300.4. Removal of the plasmin inhibitors by acidification of plasma to pH 2.0 was found to be better than using euglobulin precipitation.5. The plasma should be tested immediately after thawing and not allowed to stand after acidification for obtaining optimal conditions.6. The method can be used for determination of plasminogen in plasma in patients treated with ssss-ACA and AMCA.7. The error of the method was found to be small ssss0.4.The mean plasminogen level in a normal group of 72 was found to be 9.5 ssss 1.7 ACU/ml plasma. No variation with sex and age was found.The method proved clinically useful. During the latter half of pregnancy the plasminogen level was found to be clearly elevated. In patients with liver cirrhosis the plasminogen level was low. It was a sensitive method for following the plasminogen content during streptokinase treatment.

A Surface Plasmon Resonance Biosensor for the Determination of Salmonella

2014 ◽  
Vol 568-570 ◽  
pp. 519-522
Author(s):  
Yu Rong Yan ◽  
Pin Hua Lei ◽  
Ye Zhang ◽  
Wei Cheng ◽  
Shi Jia Ding
Keyword(s):  
Sandwich Structure ◽  
High Stability ◽  
Quantitative Detection ◽  
Target Sequence ◽  
Optimal Conditions ◽  
Promising Tool ◽  
Pm 10 ◽  
Synthetic Target ◽  
Sensitive Method

A novel and sensitive method has been successfully developed for quantitative detection of invA gene of Salmonella. The surface of sensor chip was modified and then target sequence and probe-2 were induced, which formed a sandwich structure. Under optimal conditions, the SPR-based DNA sensor displayed a linear range of 200 pM - 10 nM and a low detection limit of 200 pM for synthetic target sequence. The excellent sensitivity and high stability of the designed biosensor, make this strategy a promising tool for Salmonella screening.

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