Topic
Sodium sulfite
About: Sodium sulfite is a research topic. Over the lifetime, 2548 publications have been published within this topic receiving 18523 citations. The topic is also known as: Na2SO3 & Anhydrous sodium sulfite.
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TL;DR: In this article, a sulfite biosensor based on immobilization and bioelectrocatalysis of human sulfite oxidase (hSO) on indium tin oxide (ITO) was reported.
Abstract: In this paper we report a sulfite biosensor based on immobilization and bioelectrocatalysis of human sulfite oxidase (hSO) on indium tin oxide (ITO). Stable immobilization of catalytically active enzyme in a direct electron transfer configuration was achieved after modification of ITO with aminopropyltriethoxysilane (APTES). The electrochemical characteristics of the hSO modified electrode have been investigated by cyclic voltammetry for various pretreatment and binding conditions. Amperometry was utilized to demonstrate the current responses of the sulfite sensor toward sodium sulfite in an aqueous solution under the optimized conditions. The proposed sulfite sensor exhibits a fast response and high sulfite sensitivity with a linear range of 0.5 to 2 μM. An additional polyvinyl alcohol (PVA) cover membrane was applied to extend the linear working range. As a result, the upper concentration in the linear range for the sulfite sensor was extended from 2 μM to 20 μM for 5 % PVA. In addition, the sulfite sensor with PVA has improved storage stability when kept in 0.5 mM Tris-buffer, pH 7.0 at 4 °C.
12 citations
Patent•
26 Oct 1976TL;DR: Aqueous solutions containing mixtures of sodium dithionite and sodium sulfite having concentrations of greater than 13 percent by weight of Na 2 S 2 O 4 are stabilized by adding potassium hydroxide in an amount which is sufficient to provide a residual of from about 1 to about 12 grams per liter of solution as discussed by the authors.
Abstract: Aqueous solutions containing mixtures of sodium dithionite and sodium sulfite having concentrations of greater than 13 percent by weight of Na 2 S 2 O 4 are stabilized by adding potassium hydroxide in an amount which is sufficient to provide a residual of from about 1 to about 12 grams per liter of solution. These solutions can be stored at temperatures of from about 0° to about 15° C. without crystallization taking place.
12 citations
TL;DR: Sulfation roasting was studied to extract copper from the copper sulfide concentrate using sodium sulfite as sulfation agent and copper extraction higher than 96% was achieved at optimum roasting conditions.
Abstract: Sulfation roasting was studied to extract copper from the copper sulfide concentrate. Sodium sulfite was added as sulfation agent to the copper sulfide concentrate during roasting in this study. Sulfur removal rate at different roasting temperatures was investigated, and the effects of roasting temperature, roasting time, and the amount of sodium sulfite on copper extraction were studied. Copper extraction higher than 96% was achieved at optimum roasting conditions.
12 citations
TL;DR: In this article, an experiment was conducted in an aeration system made from 2000 mL Erlenmeyer Flask to investigate the effect of sodium sulfite with cobalt chloride and the sparging nitrogen gas on the measurement of the oxygen transfer coefficient.
Abstract: An experiment was conducted in an aeration system made from 2000 mL Erlenmeyer Flask to investigate the effect of sodium sulfite with cobalt chloride and the sparging nitrogen gas on the measurement of the oxygen transfer coefficient. Twice the theoretical quantity of sodium sulfite that is required to react with dissolved oxygen, or nitrogen sparging at a rate equivalent to that of air used during the aeration process, was used to deoxygenate the water. The results obtained from the study were consistent and repeatable and showed no significant differences in the values of the oxygen transfer coefficient obtained by the two methods.
12 citations
Patent•
11 Jun 2014
TL;DR: In this paper, a blackening liquid for a chromium-free titanium-zinc panel surface and a using method of the blackened liquid were described. But the authors did not reveal the method of applying the blackening to the surface of the panel.
Abstract: The invention discloses blackening liquid for a chromium-free titanium-zinc panel surface and a using method of the blackening liquid Raw materials of the blackening liquid comprise a main salt, auxiliary components, a complexing agent, a pH conditioning agent and water, wherein the main salt is one or several of molybdate with the massic volume concentration of 5-40g/L or sodium tungstate with the massic volume concentration of 05-10g/L or copper sulfate with the massic volume concentration of 05-20g/L or silver nitrate with the massic volume concentration of 5-40g/L; the auxiliary components comprise nickel sulfate with the concentration of 10-4g/L, sodium sulfite with the concentration of 05-4g/L, sodium thiosulfate with the concentration of 10-5g/L, aluminium chloride with the concentration of 20-5g/L, zinc chloride with the concentration of 20-5g/L and fluoric acid with the concentration of 0-40g/L A black protective layer of a titanium-zinc panel is obtained by a series of treatment of the titanium-zinc panel workpiece The black protective layer of the titanium-zinc panel is compact, uniform, pitch-black and glossy and has the characteristics of being low in cost, chromium-free, environmental-friendly and the like, the performances of the titanium-zinc panel can reach the level of foreign products, and therefore, the titanium-zinc panel has relatively strong application prospect and market competitiveness
12 citations