Journal of Analytical Chemistry

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Solid-Contact Potentiometric Sensors for the Determination of Some Cephalosporin Antibiotics in Pharmaceuticals and Oral Fluid
Journal of Analytical Chemistry - Tập 74 - Trang 52-58 - 2019
E. G. Kulapina, M. S. Tyutlikova, O. I. Kulapina, A. E. Dubasova
We developed unmodified and polyaniline-modified solid-contact potentiometric sensors based on organic ion exchangers—tetradecylammonium associates and complex compounds of silver(I) with Cefazolin (Cefotaxime, Cefuroxime). The sensors offer a wide analytical range of cephalosporin antibiotics of 1 × 10–4 (5 × 10–5) to 0.1 M; the limits of detection for antibiotics are n × 10–5 M. The introduction...... hiện toàn bộ
Optimization of the signal-to-background ratio in energy-dispersive X-ray fluorescence analysis using a Si(Li) detector
Journal of Analytical Chemistry - Tập 64 - Trang 495-504 - 2009
A. Yu. Portnoi, G. V. Pavlinskii, M. S. Gorbunov, E. O. Baranov, P. Zuzaan
A mathematical model of an energy dispersive X-ray fluorescence spectrometer is discussed based on the analysis of the processes of radiation transport in the sample and in the detector and electron transport in the detector. The results of calculations performed according to the proposed model were compared with the available experimental data. The effect of the parameters of primary X-radiation ...... hiện toàn bộ
Monochromatic model of X-ray fluorescence excitation by polychromatic radiation: New algorithms and analytical applications
Journal of Analytical Chemistry - Tập 64 - Trang 559-565 - 2009
K. V. Oskolok, O. V. Monogarova
An alternative approach was proposed to calculate the parameters of a virtual monochromatic source in the excitation of X-ray fluorescence of multicomponent samples with polychromatic radiation. Analytic expressions were obtained for the calculation of the equivalent wavelength of bremsstrahlung and mixed excitation spectrum for samples of arbitrary composition and thickness. The efficiency of the...... hiện toàn bộ
Session of the bureau of the scientific council
Journal of Analytical Chemistry - Tập 61 - Trang 1130-1130 - 2006
I. N. Kiseleva
Chemiliminescence determination of lipid hydroperoxides in biological fluids
Journal of Analytical Chemistry - Tập 72 - Trang 751-755 - 2017
E. V. Proskurnina, A. A. Dzhatdoeva, E. N. Lobichenko, R. I. Shalina, Yu. A. Vladimirov
To evaluate the oxidative stress under clinical conditions, a procedure is developed for the chemiluminescence determination of the total concentration of lipid hydroperoxides based on their oxidation in the presence of microperoxidase and chemiluminescence activator isoluminol in a borate buffer solution (pH 10.0). The limit of detection for linoleic acid hydroperoxide is 16 nM. The procedure is ...... hiện toàn bộ
Calculations and interpretation of the results of stoichiographic analysis of solid multi-element multi-phase compounds and materials
Journal of Analytical Chemistry - Tập 66 - Trang 262-268 - 2011
V. V. Malakhov, A. A. Vlasov
Methods and approaches to the calculations and interpretation of the results of stoichiographic analysis of solid multi-element multi-phase compounds and materials using the flow mode of the differential dissolution (DD) method are reported. Special features of calculationls as well as the objective reasons for the necessity of obtaining more or less precise results of stoichiographic calculations...... hiện toàn bộ
Evaluation of the Concentration Polymethylene Naphthalene Sulfonates in Concrete
Journal of Analytical Chemistry - Tập 73 - Trang 832-835 - 2018
O. V. Zamuruev, A. I. Vovk, O. M. Petrovich
A procedure is developed for the determination of technical polymethylene naphthalene sulfonates (TPNS) in concrete by HPLC. The presence of 9.8–18.8% of a fraction with a low adsorption activity in TPNS is detected. A correlation is found between the initial slump of the concrete mix cone and the refined amount of oligomers of polymethylene naphthalene sulfonic acids with n ≥ 11, contained in TPN...... hiện toàn bộ
Extraction-photometric selective determination of trace perchlorates in potable waters
Journal of Analytical Chemistry - Tập 68 - Trang 590-594 - 2013
E. V. Elipasheva, A. S. Kamasheva, P. N. Kulikov, G. M. Sergeev
A method is proposed for the selective photometry determination of perchlorates in potable water with a detection limit of 2×10−3 mg/L is proposed based on the extraction of its ion pair with the astrafloxin cation and absorbance measurements at 540 nm. The following ratios of matrix ions are acceptable (in parentheses): ClO−, ClO 2 − , ClO ...... hiện toàn bộ
Carbon isotope mass spectrometry in doping control
Journal of Analytical Chemistry - Tập 65 - Trang 825-832 - 2010
T. G. Sobolevskii, I. S. Prasolov, G. M. Rodchenkov
A procedure that makes it possible to establish the origin of endogenous steroids present in human urine by the determination of the 13C/12C carbon isotope ratio is described. A combination of solid-phase and liquid-liquid extraction, as well as semipreparative liquid chromatography, was used to separate fractions containing testosterone, 5α- and 5β-androstane-3α, 17β-diols, androsterone, ethiocho...... hiện toàn bộ
Identification of volatile organic compounds by retention times and ion mobility spectra
Journal of Analytical Chemistry - Tập 69 - Trang 1153-1158 - 2014
M. N. Levin, E. V. Lantsuzskaya (Krisilova)
Retention times are determined and ion mobility spectra are recorded for reference substances belonging to the homologous series of saturated aldehydes, ketones, and alcohols with a nonbranched chain containing from two to nine carbon atoms. For aldehydes, ketones, and alcohols, the retention times grow exponentially with the number of carbon atoms in the analyte. The retention times decrease expo...... hiện toàn bộ
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