Method for measuring sulfur in graphite

Abstract

The invention discloses a method for measuring sulfur in graphite, which comprises the following steps of: (1) putting the graphite into a porcelain crucible filled with aldrin, fully stirring the graphite and the aldrin uniformly to obtain a mixture, and then adding the aldrin to uniformly cover the mixture so as to finally obtain a sample; (2) putting the sample in the step (1) into a high temperature furnace; (3) taking out the sample from the high temperature furnace, filtering the taken-out sample and fixing the volume; (4) putting the sample solution in the step (3) into a color comparison tube, adding acid suspension of barium chromate into the color comparison tube, mixing the solution uniformly, and then standing the solution to obtain mixed solution; (5) adding calcium-containing aqueous ammonia clarified liquid into the mixed solution in the step (4), mixing the solution uniformly and then standing the solution; (6) filtering the solution in the step (5) to a cuvette by using dried intermediate-speed quantitative filter paper; and (7) measuring the corresponding absorbance of the solution at 370 nanometers of wavelength by using a 1cm cuvette and using reagent blank as contrast, and searching the quantity of the corresponding sulfate ions from a standard curve. The method has the advantages of low equipment investment, simple and convenient operation and accurate detection result by adopting a spectroscopic luminosity measuring method.

Description

technical field

[0001] The invention relates to a detection method, which is a method for determining sulfur content in graphite. Background technique

[0002] Graphite needs to be used in the diamond synthesis process. The content of sulfur in graphite directly affects the quality of diamond. The sulfur in graphite is also highly corrosive to the equipment used in the diamond synthesis process. Once these equipment are corroded, it is easy to produce blasting. Therefore, the sulfur content in graphite is strictly controlled in the production of diamond in this field. Therefore, accurate measurement of the sulfur content in graphite is one of the important measures to ensure the quality of diamond products. There are mainly two existing detection methods, one is Karl-Fischer Coulomb method, and the other is ion chromatography. The Karl-Fischer Coulomb method uses complex equipment, is easy to leak, and is not easy to operate. When the operation is inaccurate, it will affect...

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