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Abstract  

Two isothermal sections of the isobaric ternary system H2O–Na2SO4–C5H10NH were determined by isoplethic thermal analysis at 293 and 323 K. The compositions of the aqueous and organic invariant liquids, respectively L1 and L2, as well as that of the critical point, were characterized for each isotherm. The temperature of the invariant reaction was obtained by controlled flow thermal analysis and the temperature of the demixing ending, by interpolation of the monovariant lines. All these informations allowed us to establish the isobaric polythermal diagram of the H2O–Na2SO4–C5H10NH system, for the temperature range 293–323 K, as well as a qualitative representation of the monovariant curves. This system is then characterized by a wide miscibility gap, three crystallization domains, and four-three-phase invariant domains. The relevant exploitation of this diagram so permits us to deduce the demixing temperature leading to the optimal transfer of the organic compounds in the light phase and also the composition of the organic phase recovered after this first step of extraction.

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Abstract  

The results of experimental studies of the adsorption of ions at the cadmium oxide/electrolyte solution interface are presented. On the basis of kinetic changes in the concentration of cadmium, hydroxide, and sulfate ions in the solution, the processes occurring in this system are discussed. It was found that cadmium oxide is transformed into the hexagonal form of cadmium hydroxide. The surface charge data for cadmium oxide/aqueous Na2SO4 are presented.

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Rodriguez-Navarro, C. et al., 2000. How does sodium sulfate crystallize? Implications for the decay and testing building materials. Cement Concrete Research. 30 . 1527–1534. Rodriguez-Navarro C

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record of sulfate (technical raw material) containing sodium sulfate. Analogous course of DTA curves in Figs. 3 , 4 confirm the dominant content of sulfates in the sample of filter dust. Fig. 3 DTA curves of the

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.1 Chemicals and standard solutions Formic acid, sodium sulphate, sodium nitrite, potassium nitrate, and sodium hydroxide were obtained from Merck (Darmstadt, Germany). All solutions were prepared using ultrapure water obtained from a Milli

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, China). Florisil (60–100 mesh) was obtained from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Anhydrous sodium sulfate was obtained from Tianjin Kaitong Chemical Reagent Co., Ltd. (Tianjin, China). All the above chemicals were of analytical

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Acta Microbiologica et Immunologica Hungarica
Authors: Meysam Hasannejad-Bibalan, Ali Mojtahedi, Morteza Eshaghi, Mahdi Rohani, Mohammad Reza Pourshafie, and Malihe Talebi

described previously [ 10 ]. Briefly, 8-weeks old BALB/c were treated by adding 5% dextran sodium sulfate into the drinking water for 8 days. All experiments were performed by supervision and approval of the animal experimentation ethics committee of Pasteur

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Abstract  

The rate of some heterogeneous isotopic exchange reactions can be enhanced by the simultaneous hydration of the solid participating in the exchange process. The results presented here show that the concomitant hydration of anhydrous sodium sulphate enhances the Na2SO422Na+ isotopic exchange reaction in a water-acetone medium. The reaction rate is further enhanced by creating a controlled number of vacancies in the crystal lattice of sodium sulphate by doping.

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Abstract  

Isoplethic thermal analysis was used to determine the solid-liquid-liquid equilibria in the ternary system water-sodium sulfate-piperidine. The changes in state observed on the thermogram recorded during the displacement in a quasi-binary section permit the identification of the different phases and the delimitation of the corresponding equilibrium domains. Two isotherms were established at 25°C and 40°C because these temperatures frame the peritectic decomposition of the sodium sulfate decahydrate. Miscibility gaps were completely delimited and each critical point was calculated. This study permitted to determine the optimal conditions for separating the organic phase by liquid-liquid extraction.

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Abstract  

Some35S labeled thiophene derivatives have been prepared by biosynthesis inin vitro cultures ofTagetes sp. A different sources of isotopic sulfur were tested and the best results were achieved with [35S] sodium sulfate. Elemental sulfur was not incorporated. Radiochemical yields were around 1%.

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