Search Results - "Andriy B. Vishnikin"

Stepwise injection spectrophotometric determination of epinephrine by Bulatov, Andrey V., Petrova, Anastasiia V., Vishnikin, Andriy B., Moskvin, Aleksey L., Moskvin, Leonid N.

“…Simple, rapid and fully automated methods for the manual and automated spectrophotometric determination of epinephrine have been developed by using schemes of…”
Get full text

Speciation of chromium through aqueous two-phase extraction of complexes of Cr(III) with 4-(2-pyridylazo)resorcinol and Cr(VI) with 1,5-diphenylcarbazide by Simonova Tamara N., Dubrovina Valentina A., Vishnikin Andriy B.

“…A green, sensitive and selective methods are described for the preconcentration and speciation of chromium species in natural waters. The developed methods are…”
Get full text

Using an Optical Probe as the Microdrop Holder in Headspace Single Drop Microextraction: Determination of Sulfite in Food Samples by Zaruba, Serhii, Vishnikin, Andriy B, Škrlíková, Jana, Andruch, Vasil

“…A novel headspace single-drop microextraction method (HS-SDME) for determination of sulfite in the form of sulfur dioxide was developed. An optical probe was…”
Get full text

A novel vortex-assisted liquid–liquid microextraction approach using auxiliary solvent: Determination of iodide in mineral water samples by Zaruba, Serhii, Vishnikin, Andriy B., Andruch, Vasil

“…A novel vortex-assisted liquid–liquid microextraction (VA-LLME) for determination of iodide was developed. The method includes the oxidation of iodide with…”
Get full text

A two-in-one device for online monitoring of direct immersion single-drop microextraction: an optical probe as both microdrop holder and measuring cell by Zaruba, Serhii, Vishnikin, Andriy B., Škrlíková, Jana, Diuzheva, Alina, Ozimaničová, Ivana, Gavazov, Kiril, Andruch, Vasil

“…For the first time an optical probe is proposed as the microdrop holder and simultaneously the measuring cell in a direct immersion single-drop microextraction…”
Get full text

Simultaneous determination of rutin and ascorbic acid in a sequential injection lab-at-valve system by Al-Shwaiyat, Mohammed khair E.A., Miekh, Yuliia V., Denisenko, Tatyana A., Vishnikin, Andriy B., Andruch, Vasil, Bazel, Yaroslav R.

“…[Display omitted] •Simultaneous determination of two reducing agents in pharmaceuticals.•Improvement of precision and sensitivity in a sequential injection…”
Get full text

A highly selective and sensitive colorimetric chemosensor based on polyurethane foam impregnated with 3-methyl-2, 6-dimercapto-1,4-thiopyrone for on-site preconcentration and determination of palladium(II) by Khudyakova, Svetlana N., Vishnikin, Andriy B., Smityuk, Nataliya M.

“…A new sorbent and chemosensor for highly selective and sensitive on-site preconcentration and colorimetric determination of Pd(II) was developed based on its…”
Get full text

Stepwise injection spectrophotometric determination of cysteine in biologically active supplements and fodders by Bulatov, Andrey V., Petrova, Anastasiia V., Vishnikin, Andriy B., Moskvin, Leonid N.

“…A stepwise injection analysis system was developed to monitor the concentration of l-cysteine in biologically active supplements (BAS) and fodders. It is based…”
Get full text

Highly sensitive sequential injection determination of p-aminophenol in paracetamol formulations with 18-molybdodiphosphate heteropoly anion based on elimination of Schlieren effect by Vishnikin, Andriy B., Al-Shwaiyat, Mohammed K.E.A., Petrushina, Galina A., Tsiganok, Ludmila P., Andruch, Vasil, Bazel, Yaroslav R., Sklenářová, Hana, Solich, Petr

“…► Determination of p-aminophenol with 18-molybdodiphosphate by SIA method. ► A new strategy has been proposed to reduce the Schlieren effect. ► Careful…”
Get full text

11-Molybdobismuthophosphate—A new reagent for the determination of ascorbic acid in batch and sequential injection systems by Vishnikin, Andriy B., Svinarenko, Tatyana Ye, Sklenářová, Hana, Solich, Petr, Bazel, Yaroslav R., Andruch, Vasil

“…The guanidinium salt of the new heteropolymolybdate 11-molybdobismuthophosphate Gua 6PBiMo 11O 40 (11-MBP) was synthesized, characterized and used as a reagent…”
Get full text

Determination of Ascorbic Acid with Wells-Dawson Type Molybdophosphate in Sequential Injection System by Vishnikin, Andriy B., Sklenářová, Hana, Solich, Petr, Petrushina, Galina A., Tsiganok, Ludmila P.

“…Two-electron reduced heteropolyblue is formed very fast at pH 3.75-4.75 in the reaction between Dawson-type molybdophosphate HPA and ascorbic acid (AsA) (ϵ 814…”
Get full text

Sequential injection determination of orthophosphate as ion associate of 12-molybdophosphate with Astra Phloxine by Khlyntseva, Svitlana V., Vishnikin, Andriy B., Al-Shwaiyat, Mohammed K.E.A., Sklenářová, Hana, Solich, Petr, Bazel, Yaroslav R., Andruch, Vasil

“…A simple and fast reaction between 12-molybdophosphate heteropoly anion and the polymethine dye Astra Phloxine was used for the development of a new SIA method…”
Get full text

Rapid, sensitive and selective spectrophotometric determination of phosphate as an ion associate of 12-molybdophosphate with Astra Phloxine by VISHNIKIN, Andriy B, AL-SHWAIYAT, Mohammed Khair E. A, BAZEL, Yaroslav R, ANDRUCH, Vasil

“…A highly sensitive and selective reaction of 12-molybdophosphate with the polymethine dye Astra Phloxine has been used for the spectrophotometric determination…”
Get full text

Application of solidification of floating organic drop microextraction for inorganic anions: Determination of phosphate in water samples by Zaruba, Serhii, Vishnikin, Andriy B., Andruch, Vasil

“…A novel dispersive liquid–liquid microextraction based on solidification of a floating organic drop (DLLME-SFO) for determination of orthophosphate was…”
Get full text

Use of dye aggregation phenomenon for spectrophotometric and SIA-LAV determination of bismuth(III) as a specific ion association complex between tetraiodobismuthate and Astra Phloxine by Hedjazi, Mehieddine, Vishnikin, Andriy B., Okovytyy, Sergiy I., Miekh, Yuliia V., Bazel, Yaroslav R.

“…•Spectrophotometric and SIA-LAV methods are developed for bismuth(III) determination.•Changes in the absorption spectra are associated with phenomenon of dye…”
Get full text

Evaluation of polypropylene and polyethylene as sorbent packing materials in on-line preconcentration columns for trace Pb(II) and Cd(II) determination by FAAS by Kazantzi, Viktoria, Drosaki, Eleni, Skok, Arina, Vishnikin, Andriy B., Anthemidis, Aristidis

“…A novel flow injection solid phase extraction system coupled with flame atomic absorption spectrometer for automatic trace metal determination has been…”
Get full text

Digital colorimetric determination of vitamin C using 18-molybdo-2-phosphate by Galyna O. Petrushyna, Andriy B. Vishnikin, Ludmyla I. Puhach, Svitlana O. Khmelovs’ka, Darya V. Pidgorna

“…Reduction with ascorbic acid of tetraethylammonium salt of 18-molybdo-2-phosphate heteropoly complex impregnated on the filter or the chromatographic paper was…”
Get full text

Vortex-assisted liquid-liquid microextraction procedure for iodine speciation in water samples by Zaruba, Serhii, Bozóová, Veronika, Vishnikin, Andriy B., Bazeľ, Yaroslav R., Šandrejová, Jana, Gavazov, Kiril, Andruch, Vasil

“…A novel, sensitive and selective method for the spectrophotometric determination of the basic inorganic iodine species was developed based on the…”
Get full text

ОСОБЛИВОСТІ КОМПЛЕКСОУТВОРЕННЯ 3-МЕТИЛ-2,6-ДИМЕРКАПТО-1,4-ТІОПІРОНУ З РІЗНИМИ ХІМІЧНИМИ ФОРМАМИ РОДІЮ(III) by Khudyakova, Svetlana N., Vishnikin, Andriy B.

“…Теоретично обґрунтовано та описано особливості взаємодії сульфатних та хлоридних комплексів родію(III) з 3-метил-2,6-димеркапто-1,4-тіопіроном (МДТ) у широкому…”
Get full text

Simultaneous determination of two active components of pharmaceutical preparations by sequential injection method using heteropoly complexes by Mohammed Khair E. A. Al-Shwaiyat, Tatyana A. Denisenko, Sergey V. Zaruba, Andriy B. Vishnikin, Ludmila P. Tsiganok, Vasil Andruch, Yaroslav R. Bazel

“…New approach has been proposed for the simultaneous determination of two reducing agents based on the dependence of their reaction rate with…”
Get full text