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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Patent•
11 Jun 2008
TL;DR: A manufacturing method of a quick testing test paper of salt and sulfurous acid in food is provided in this paper, which is characterized in that: firstly Fe solution and Phen solution are prepared according to the mol ratio 1:8 to 12, then sodium acetate-acetic acid buffering solution with the 48-52 pH value is added, filter paper is immersed in the mixture solution for 3 to 5 hours, and the filter paper was taken out Then the test paper is taken out to dry in air, and one of each is takenout to make testing test papers according
Abstract: A manufacturing method of a quick testing test paper of salt and sulfurous acid in food is provided, which is characterized in that: firstly Fe solution and Phen solution are prepared according to the mol ratio 1:8 to 12, then sodium acetate-acetic acid buffering solution with the 48-52 pH value is added, filter paper is immersed in the mixture solution for 3 to 5 hours, and the filter paper is taken out Then the filter paper is immersed in the sodium sulfite solution in grads and different viscosity ranging from 10 is multiplied by 10 molL to 80 is multiplied by 10 molL for 20 to 40s The filter paper is taken out to dry in air, and one of each is taken out to make testing test paper according to the viscosity grads sequence of sodium sulfite The testing test paper in the invention has simple manufacturing method, which provides a quick and convenient method to test the salt and sulfurous acid in food and is particularly suitable for using by individual and in household
5 citations
Patent•
21 Nov 2017
TL;DR: In this paper, a high-temperature-resisting filtration-loss reducer for drilling fluid is presented, which is prepared from the following raw materials, including acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and N-vinylpyrrolidone.
Abstract: The invention discloses a preparation method of a high-temperature-resisting filtration-loss reducer for drilling fluid. The high-temperature-resisting filtration-loss reducer is prepared from the following raw materials, including acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and N-vinylpyrrolidone; the optimum condition for synthesis is that the four monomers are used in parts by weight: 35-45 parts of acrylamide, 25-30 parts of acrylic acid, 25-35 parts of 2-acrylamido-2-methylpropane sulfonic acid and 5-8 parts of N-vinylpyrrolidone, which are subjected to aqueous solution polymerization to obtain the high-temperature-resisting filtration-loss reducer; the reducer also comprises 1-3 parts of an initiator assistant, namely chitosan Mn-bentonite; the reaction temperature is 30-40 DEG C, the reaction time is 8h, the ratio of oxidation/reduction initiator, namely n sodium persulfate to n sodium sulfite being 1.2 to 1, 0.3 part by weight of the initiator, is adopted, and the optimum pH value of a monomer solution is 7-8. The product can resist high temperature of 210 DEG C, and the filtration loss reducing effect is good.
5 citations
TL;DR: A flow analytical system using the sodium sulfite/hydrogen peroxide autocatalytic reaction system was developed in this article, where a sulfite solution containing a pH indicator and bromo thymol blue (BTB), and a hydrogen peroxide solution were pumped by a mechanical system, and then mixed while flowing.
Abstract: A flow analytical system using the sodium sulfite/hydrogen peroxide autocatalytic reaction system was developed. A sulfite solution containing a pH indicator and bromo thymol blue (BTB), and a hydrogen peroxide solution were pumped by a mechanical system, and then mixed while flowing. The blue‐colored solution changed to yellow in the mixing coil. Furthermore, when horseradish peroxidase (HRP) was mixed with them, the length of the blue‐colored band decreased. The relationship between the blue band length and logarithm value of the HRP concentration was linear in the concentration range of 1 to 50 ppm.
5 citations
TL;DR: In this article, the synthesis of soft magnetic Fe-Co nanobars by an improved polyol process using cetyltrimethylammonium bromide (CTAB) as stabilizer was reported.
Abstract: We report the synthesis of soft magnetic Fe-Co nanobars by an improved polyol process using cetyltrimethylammonium bromide (CTAB) as stabilizer. The synthesized samples were studied by using Transmission Electron Microscopy. The Fe-Co nanoparticles were characterized by X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectroscopy and Vibrating Sample Magnetometer. The Fe-Co nanobars showed prominent UV-VIS absorption at 371 nm. This report discusses the effect of sodium sulfite and CTAB on the synthesis of Fe-Co nanoparticles.
5 citations
01 Jan 1991
TL;DR: In this paper, the effects of depithed bagasse in cold soda chemimechanical pulping were investigated. And the effect of wet depithing in the presence of a chelating agent was shown to reduce colour and metal ions content.
Abstract: The effects of wet depithing of fresh and stored bagasse were initially studied. Intense wet depithing in the presence of a chelating agent reduces colour and metal ions content. The effects of sodium hydroxide charge up to 5% in cold soda chemimechanical pulping of depithed bagasse were later studied. Pretreatment at 90°C is detrimental to pulp colour. With a low alkali charge darkening can be diminished if a low temperature (80°C) is used; for higher charges the temperature has to be reduced further. Wet bulk stored bagasse darkens less than fresh bagasse and is also more responsive to the action of sodium sulfite
5 citations