Journal of Analytical Chemistry

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Extraction-photometric determination of gallium with phenylfuorone in alkaline carbonate solutions in the presence of polyethylene glycol
Journal of Analytical Chemistry - Tập 61 - Trang 566-570 - 2006
T. G. Dzherayan, V. M. Shkinev, A. M. Reznik, A. N. Mitronov, V. K. Karandashev
The main regularities in the extraction of gallium from alkaline carbonate solutions with phenylfluorone in the system polyethylene glycol (PEG)-sodium carbonate-water were studied by spectrophotometry and inductively coupled plasma mass spectrometry. It was demonstrated that, under these conditions, the distribution coefficient of gallium is above 100 and the recovery is ∼98% (at the ratio of pha...... hiện toàn bộ
Estimation of the contribution of absorption bands for overtones and composite frequencies in IR spectra of olefins and heteroatomic organic compounds
Journal of Analytical Chemistry - Tập 65 - Trang 1235-1241 - 2010
A. I. Pavlyuchko, E. V. Vasil’ev, L. A. Gribov
Intensities of fundamental, overtone, and composite absorption bands for 11 olefins, 17 nitrogen- and oxygen-containing organic compounds, and 12 sulfur-containing organic compounds are calculated in the anharmonic approximation. The first and second derivatives of the electric dipole moment of a molecule were calculated by the quantum-chemical ab initio MP2/6-31G(1d) approach. It is shown that, f...... hiện toàn bộ
Sensitive LC-ESI/MS/MS assay for the quantification and pharmacokinetic study of roxithromycin in human serum
Journal of Analytical Chemistry - - 2013
Xu Yu, Na Li, Yun Luo, Junjie Sun, Bo Jiang, Qi Guo
Effect of the composition of aqueous-organic mixtures on the sensitivity of thermal lens measurements
Journal of Analytical Chemistry - Tập 63 - Trang 1066-1072 - 2008
A. A. Zhirkov, S. N. Bendrysheva, M. A. Proskurnin, B. K. Zuev
Thermooptical properties of aqueous solutions of methanol, acetonitrile, dimethyl sulfoxide, ethylene glycol, glycerol, 1,4-dioxane, and sucrose were studied, and it was found that the analytical thermal lens signal depends on the nature of the organic component, most of all, on the polarity and molecular size. The sensitivity coefficient of thermal lens measurements is increased to a maximum exte...... hiện toàn bộ
Retention indices of symmetric dicarboxylic acid esters
Journal of Analytical Chemistry - Tập 63 - Trang 349-352 - 2011
S. V. Lipp, E. L. Krasnykh, S. V. Levanova
Retention indices of 28 symmetric dicarboxylic acid esters containing from two to six carbon atoms in the acid residue were determined experimentally. The temperature dependences of the retention indices were linear. Equations were proposed to predict the retention indices for symmetric and mixed C2–C6 dicarboxylic acid esters.
An ultra superfast identification of low-molecular components of pharmaceuticals by DART mass spectrometry
Journal of Analytical Chemistry - Tập 65 - Trang 1537-1539 - 2010
E. S. Chernetsova, P. O. Bochkov, M. V. Ovcharov, G. V. Zatonskii, R. A. Abramovich
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
Aleksandr Lazarevich Yakubovich on His 85th Birthday
Journal of Analytical Chemistry - Tập 59 - Trang 1010-1011 - 2004
Methodology of the spectrophotometric analysis of mixtures of organic substances: Nonadditivity of light absorption
Journal of Analytical Chemistry - Tập 66 - Trang 22-30 - 2011
I. V. Vlasova, V. I. Vershinin, T. G. Tsypko
The typology of the problems being solved in the analysis of multicomponent mixtures of organic substances (pharmaceutical preparations, petroleum products, and others) is proposed. The difficulties associated with the problems of each type are discussed, and the potential of spectrophotometry without the separation of components in overcoming the difficulties is considered. The nonadditivity of l...... 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
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