Method for continuously detecting content of sulfite and sulfide in building material and geological material

Abstract

The invention discloses a method for continuously detecting content of sulfite and sulfide in a building material and a geological material. The method comprises the following steps of: collecting a sample of the building material or the geological material, dissolving the sample together with hydrochloric acid and stannous chloride in a closed container, taking out released sulfur dioxide and hydrogen sulfide by using highly pure nitrogen or argon airflows, absorbing by using sodium hydroxide or potassium hydroxide solution, detecting the concentration of sulfite ions generated in the absorbed solution by using ion chromatography, thus obtaining the content of the sulfite through calculation; and oxidizing the absorbed solution by using hydrogen peroxide, wherein both the sulfite and the sulfide are oxidized into sulfate, detecting the concentration of sulfate ions by using the ion chromatography, and then obtaining the content of the sulfide by the measured concentration of the sulfate ions and the measured concentration of the sulfite ions through the calculation (subtraction method). The method plays an important role in detecting the content of the sulfite and that of the sulfide in the building material and the geological material, and the application prospect is brilliant.

Description

technical field [0001] The invention belongs to the field of material analysis, and relates to a method for determining the content of sulfite and sulfide in building materials and geological materials in the fields of building material inspection and geological inspection. The method can be specifically used for building materials such as gypsum and gypsum products, cement, and sand , and continuous determination of sulfite and sulfide content in geological materials such as soil and sludge. Background technique [0002] In many building materials, sulfur trioxide content is an important indicator that needs to be tested. Various cement, sandstone, fly ash, silica fume, gypsum, and concrete admixture products all have limit requirements for sulfur trioxide. The determination of sulfur trioxide in the current standard method generally adopts the hydrochloric acid solution gravimetric method, such as the determination method recorded in GB / T176-2008 "Methods for Chemical Anal...

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Problems solved by technology

[0003] At present, the determination of sulfite and sulfide content in building materials generally adopts the iodometric method, such as the determination method of sulfide content recorded in GB / T176-2008 "Cement Chemical Analysis Methods", JC / T2074-2011 "Flue Gas The determination method of calcium sulfite hemihydrate content recorded in "Desulfurized Gypsum", but the above method has the problem of mutual interference between sulfite and sulfide. In fact, the total amount of sulfite and sulfide is measured, which is only suitable for different The determination of sulfite in sulfide-containing materials or the determination of sulfide in materials without sulfite. For materials where sulfite and sulfide coexist (such as gypsum, etc.), the iodometric method cannot be used content and sulfide content were determined separately

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