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排序方式: 共有78条查询结果,搜索用时 46 毫秒
1.
Sabry K. Mohamed 《Analytica chimica acta》2006,562(2):204-209
A poly(vinyl chloride)-based membrane of 2,9-dimethyl-4,11-diphenyl-1,5,8,12-tetraazacyclotetradeca-1,4,8,11-tetraene (DDTCT) with sodium tetraphenyl borate (STB) as an anion excluder and dibutyl phthalate (DBP), dibutyl butylphosphonate (DBBP), tris(2-ethylhexyl) phosphate (TEP) and tributyl phosphate (TBP) as plasticizing solvent mediators was prepared and investigated as a Ga(III)-selective electrode. The best performance was observed with the membrane having the ligand-PVC-DBP-STB composition 1:4:1:1, which worked well over a wide concentration range (1.45 × 10−6 to 0.1 mol L−1) with a Nernstian slope of 28.7 mV per decade of activity between pH 4.0 and 10.0. This electrode showed a fast response time of 12 s and was used over a period of 100 days with good reproducibility (s = 0.3 mV). The selectivity coefficients for monovalent, divalent and trivalent cations indicate excellent selectivity for Ga(III) ions over a large number of cations. Anions such as Cl− and SO42− do not interfere and the electrode also works satisfactorily in partially water-alcohol medium. The practical utility of the membrane sensor has also been observed in solutions contaminated with detergents, i.e., cetyltrimethylammonium bromide and sodium dodecyl sulfate and used for the determination of gallium in nickel alloy, fly-ash and biological samples. 相似文献
2.
Sabry A. El-Korashy 《Monatshefte für Chemie / Chemical Monthly》2002,133(3):333-343
Summary. Solid crystalline calcium silicate hydrate (I) synthesized from equimolar amounts of Ca and Si under hydrothermal conditions
at 120°C shows cation exchange properties towards divalent metal cations such as Ni, Cu, Cd, or Hg. It also exhibits caesium
selectivity in the presence of Na+. The exchange capacity and selectivity of the solid can be increased by 10 and 28%, respectively, upon substitution of 0.01 mol
of the Ca2+ in its structure by Na+. The ability of metal cation uptake by the solid was found to obey the order Ni2+ > Hg2+ > Cu2+ > Cd2+. The different affinities of calcium silicate hydrate (I) towards these ions can be used for their separation from solutions
and also in nuclear waste treatment. The mechanism of the exchange reaction is discussed.
Received June 11, 2001. Accepted September 10, 2001 相似文献
3.
Yousry M. Issa Hosny Ibrahim Adel F. Shoukry Sabry K. Mohamed 《Mikrochimica acta》1995,118(3-4):257-263
Ion-association complexes of antazoline HCl [I], hydralazine HCl [II], amiloride HCl [III] and quinine sulphate [IV] with [Co(SCN)4]2– and [Co(NO2)6]3– were precipitated and the excess unreacted cobalt complex was determined. A new method using atomic emission and atomic absorption spectrometry for the determination of the above drugs in pure solutions and pharmaceutical preparations is given. The drugs can be determined in the ranges 0.3–3.0, 0.19–1.96, 0.3–3.0, and 0.78–7.82 mg/25 ml solutions of I, II, III, and IV, respectively, with mean relative standard deviations of 0.65–2.03 % and recovery values of 95.76–101.2% indicating high precision and accuracy. 相似文献
4.
Salah Abd El Wanees Sabry Hamed Seda 《Journal of Dispersion Science and Technology》2013,34(12):1813-1826
AbstractThe kinetics of H2 production during Zn corrosion in 0.5?M HCl without and with various additives of N,N'-bis-(1-hydroxyphenylimine)-2,5-thiophenedicarboxaldehyde (HPTD) was studied using gasometry and electrochemical techniques. The surface of the corroded Zn samples was investigated using SEM and Optical Profilometry. The rate of H2 production (RHP) increased with the immersion time and temperature. Presence of HPTD mitigated RHP due to an adsorption process. The electrochemical impedance spectroscopy showed that HPTD had a good inhibitive effect. Polarization data proved that HPTD acted as a surface-active mixed-type inhibitor. Some thermodynamic parameters were deduced and discussed. Theoretical calculations were also conducted to corroborate the capability of HPTD to protect Zn surface from corrosion process. 相似文献
5.
Karim Samy El-Said Shaimaa Hussein Barakat M. Alrashdi Heba A. Mahmoud Mahrous A. Ibrahim Mohamed Elbakry Hala El-Tantawy Doaa Ibrahim Kabil Sabry A. El-Naggar 《Molecules (Basel, Switzerland)》2022,27(2)
Heavy metals intoxication causes several health problems that necessitate finding new protective and therapeutic approaches. This study aimed to evaluate the impact of Musa sp. leaves extract (MLE) on hepato-renal toxicities induced by cadmium (Cd) in male mice. The phytochemical screening, metal chelating activity (MCA), and the median lethal dose (LD50) of MLE were determined. Fifty CD-1 male mice were used and intraperitoneally (i.p.) injected with MLE (1000 to 5000 mg/kg b.wt) for MLE LD50 determination. Another 50 mice were used for evaluating the effect of MLE on Cd toxicity. Blood samples were collected for hematological, liver, and kidney functions assessments. Liver tissue homogenates were used for determination of oxidant/antioxidant parameters. Liver and kidney tissues were harvested for histopathological and molecular investigations. MLE showed potent in vitro antioxidant activities. The MCA and LD50 of the MLE were 75 µg/mL and 3000 mg/kg b.wt, respectively. MLE showed beneficial therapeutic activity against hepato-renal toxicities in Cd-intoxicated mice, evidenced by improving the hematological, biochemical, histopathological, and molecular alterations. 相似文献
6.
An integral method is proposed in order to study the solution behavior of viscous flow problems near a corner singularity. The method involves a partial analytical resolution, which gives rise to many advantages. An expansion over the operator eigenfunctions is introduced instead of discretization. Accuracy is increased, especially for problems with singular boundaries. The resulting algebraic system is well conditioned. Last, but not least, the number of surface unknowns is reduced compared with classical boundary-element methods. The above advantages largely outweigh the more elaborate preparatory steps needed. Both the proposed method and the boundary-element method are applied to the study of the flow field inside a circular cylinder, in order to evaluate the performance of the latter near the corner. 相似文献
7.
Sabry Mohamed Khalil 《Mikrochimica acta》2007,158(3-4):233-238
A simple, accurate, precise and sensitive method has been developed for the determination of Vardenafil (Vd) using direct
coupled plasma atomic emission spectrometry. The ion associates formed as a result of the reaction of vardenafil with ammonium
reineckate, Mn(II) and Co(II) thiocyanates and sodium cobaltinitrite are precipitated. The solubility of the solid complexes
under the optimum conditions of pH and ionic strength was studied. Saturated solutions of each ion associate at different
temperatures under the optimum precipitation conditions were prepared, and the metal ion content in the supernatant was determined.
The solubility products were thus calculated at different temperatures, and the thermodynamic parameters ΔH, ΔG and ΔS were
calculated. The method has been used for the determination of vardenafil (1.36–68.32 μg·mL−1) in pure solutions and in Levitra tablets. 相似文献
8.
A Fourier-based technique for electromagnetic (EM) wave reconstruction with application to polarimetric airborne and spaceborne radar data exploitation is presented. The method is different from conventional modelling techniques for Synthetic Aperture Radar (SAR) applications as a result of the full electromagnetic treatment of field interactions with the scatterer, the possibility of introducing new and controllable feature classes for target classification, and accurate decomposition of the source impulse response function that avoids potential errors (e.g. loss of coherent information) associated with the spherical phase approximations. The capability of extracting scatterer information such as the coherent radar cross section (RCS) is explored. 相似文献
9.
Shaaban Sabry Romero-Silva Rodrigo 《Central European Journal of Operations Research》2021,29(4):1253-1288
Central European Journal of Operations Research - This simulation study investigates whether machine efficiency, mean time to failure (MTTF) and mean time to repair (MTTR) significantly affect the... 相似文献
10.
Selim Rehab E. Ahmed Hanaa H. Abd-Allah Somia H. Sabry Gilane M. Hassan Rasha E. Khalil Wagdy K. B. Abouhashem Nehal S. 《Applied biochemistry and biotechnology》2019,189(1):284-304
Applied Biochemistry and Biotechnology - Acute kidney injury (AKI) is a rapid loss of renal function. It has high mortality rates. Still, renal replacement therapy is considered the best solution... 相似文献