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: A low-contrast mauve color, different from the clear reds, purples and blue previously given by the Bodian Protargol (silver-protein) method with insect central nerve ganglia, was found to be caused by an impurity in the analytical grade sodium sulfite used in the hydroquinone silver developer.
Abstract: A low-contrast mauve color, different from the clear reds, purples and blue previously given by the Bodian Protargol (silver-protein) method with insect central nerve ganglia, was found to be caused by an impurity in the analytical grade sodium sulfite used in the hydroquinone silver developer. Impurities having the same effect were present in about half the samples of sulfite tested and appeared to be more complex sodium sulfoxy compounds. Recrystallization of the sulfites from hot water readily removed the impurity from every sample and restored the ability of the stain to give the desired colors.
6 citations
Patent•
02 Apr 2014
TL;DR: In this article, an army green zinc-coated chrome-free passivator III for a bondy pipe is described, which is prepared by dissolving and uniformly mixing materials such as sodium molybdate, sodium citrate, sodium sulfite, oxalic acid and nickel acetate according to a certain ratio.
Abstract: The invention relates to an army green zinc-coated chrome-free passivator III for a bondy pipe. The passivator is prepared by dissolving and uniformly mixing materials such as sodium molybdate, sodium citrate, sodium sulfite, oxalic acid and nickel acetate according to a certain ratio. A passivating film is synthesized, so that the corrosion resistance of a coating is improved; meanwhile, the coating is endowed with the black bright uniform army green passivating film.
6 citations
Patent•
02 Jul 2001
TL;DR: In this article, a sample solution containing ammoniacal nitrogen is allowed to flow down in a capillary for channels, at the same time, a reaction reagent is poured into the sample solution from a reagent solution injection port for mixing, a gas constituent being separated from a liquid phase is converted to nitrogen monoxide by a heating oxidation oven 8 in a gas-liquid separator such as a gas liquid separation tube 7 for supplying to a chemical light emission detector in a Chemical Light Emitting Emitting Device (CEE) section 10, and Chemical light emission intensity is
Abstract: PROBLEM TO BE SOLVED: To discharge drain being discharged from an ammonia measurement process to a peripheral environment without any obstruction. SOLUTION: In the measurement of ammonia, a sample solution containing ammoniacal nitrogen is allowed to flow down in a capillary for channels, at the same time, a reaction reagent is poured into the sample solution from a reagent solution injection port for mixing, a gas constituent being separated from a liquid phase is converted to nitrogen monoxide by a heating oxidation oven 8 in a gas-liquid separator such as a gas-liquid separation tube 7 for supplying to a chemical light emission detector in a chemical light emission section 10, and chemical light emission intensity is detected for measuring ammoniacal nitrogen concentration in the sample solution by a flow injection analysis method and a chemical light emission method. In this case, a reducing agent comprising sodium ascorbic acid, sodium thiosulfate, sodium sulfite, or L-sodium ascorbic acid is injected to waste liquid being discharged from the gas-liquid separator, thus removing remaining chlorine in the waste liquid.
6 citations
TL;DR: In this paper, the reaction of 3-nitropyridine with an aqueous solution of sodium sulfite gave the disodium salt of 5-(N-sulfohydroxyamino)pyridine-2 -sulfonic acid.
Abstract: The reaction of 3-nitropyridine with an aqueous solution of sodium sulfite gave the disodium salt of 5-(N-sulfohydroxyamino)pyridine-2-sulfonic acid (2) which on treatment with an acidic ion exchange resin gave 5-hydroxyaminopyridine-2-sulfonic acid (3). The yield of 3 from 3-nitropyridine was 63%. The structures of the products were verified by X-ray analysis.
6 citations
01 Jan 2002
TL;DR: Based on molecular mechanics, a structure-property relationship between the stability of thiourea and the structure of sodium sulfite was studied by a combination of software calculation of HYPERCHEM6.0 with the experiment of infrared spectrum.
Abstract: Based on molecular mechanics (MM), a structure-property relationship between the stability of alkaline thiourea and the structure of thiourea and sodium sulfite is studied by a combination of software calculation of HYPERCHEM6.0 with the experiment of infrared spectrum. The results show that a double-bond between carbon and nitrogen exists in aqueous thiourea because of isomer. Hydrogen-sulfur bond formed easily decreases the energy of HOMO of thiourea molecular, resulting in the stability of thiourea in acidic medium. It is difficult to form hydrogen-sulfur bond in alkaline thiourea, and the energy of HOMO of thiourea molecular in alkaline medium is obviously higher than that in acidic medium, which causes unstability of alkaline thiourea. Sodium sulfite molecular, however, forms a stable orbicular structure with thiourea molecular through interlink of couple isolated electrons, reducing HOMO value of thiourea, and improving the stability of alkaline thiourea. It is concluded from molecular force field that an efficient stability agent for alkaline thiourea must meet the needs of two conditions, i.e., forming hydrogen-sulfur bond easily and a stable orbicular structure with thiourea molecular in alkaline medium.
6 citations