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.

Process for manufacturing sulfur from a solution of sodium sulfite

Abstract: A solution of sodium sulfite or sulfide is reacted with ammonium sulfate, so as to produce a gas containing SO 2 or H 2 S, NH 3 and H 2 O, which is thereafter treated for sulfur production and NH 3 recovery, and a liquid outflow containing sodium sulfate which is reacted with CO 2 and NH 3 , in order to produce NaHCO 3 and regenerate the ammonium sulfate. NaHCO 3 may be converted to sodium carbonate and CO 2 , the latter being re-used in the process.

A rapid method of sample preparation for determining arsenic in water by stripping voltammetry

Abstract: A procedure was developed for sample preparation for the further determination of arsenic in potable and natural water and process solutions by stripping voltammetry (SV). To minimize the losses and simplify the procedure, arsenic(III) was oxidized by the ozonation or UV irradiation of the solution in the presence of sulfite, chloride, or hydroxide ions, which increased the oxidation efficiency. The time required for 100% oxidation does not exceed 60 s for an arsenic concentration of no more than 1 mg/L. The reduction to arsenic(III) was performed photochemically in the presence of sodium sulfite for 5 min. Further stripping voltammetric determination was performed in the same solution using a gold-plated carbon electrode. The developed procedure is rapid, simple, and easy-to-automate.

Reduction treatment method for ballast water

Abstract: The present invention relates to a method for reduce treating ballast water which has been subjected to a biocidal treatment with a chlorine-based oxidizing agent or an oxygen-based oxidizing agent, by using a tablet or pellet of sodium sulfite.

Process and composition for pickling metal surfaces

Abstract: Metal surfaces are conditioned by subjecting the metal to the action of an acid pickling bath containing a pickling acid which reacts with the metal to condition the surface thereof. This reaction also produces hydrogen gas which forms a film on the surface of the metal which film inhibits the rate of reaction between the pickling acid and the metal. A compound capable of liberating elemental colloidal sulfur which reacts with the hydrogen gas to form hydrogen sulfide and thereby decrease the amount of the hydrogen film present to thereby increase the effectiveness of the pickling acid is added to the acid pickling bath. An effective amount of sodium sulfite is also added to the acid pickling bath to cause sodium thiosulfate to be produced in situ whereby the colloidal sulfur is maintained at a fine particulate size to thereby increase the effectiveness of the colloidal sulfur and consequently more effectively remove the hydrogen film from the surface of the metal to thereby further increase the effectiveness of the pickling acid.

Preparation of cation exchange resin

Abstract: PURPOSE: To obtain the titled resin with a small amount of dissolved polystyrenesulfonic acid, by treating a cation exchange resin, e.g. the solfnic acid type, with a reducing agent. CONSTITUTION: A reducing agent, e.g. sodium sulfite or dimethylaniline soluble in water or a solvent capable of dissolving in water in an optional proportion, is dissolved in the water or solvent capable of dissolving in water in an optional proportion, and a sulfonic acid cation exchange resin is added to the resultant solution and treated preferably at room temperature W100°C for 2W24hr. COPYRIGHT: (C)1984,JPO&Japio