Method for determining content of water-insoluble substances in sodium carbonate by using microporous filter membrane

Abstract

The invention discloses a method for determining the content of water-insoluble substances in sodium carbonate by using a microporous filter membrane. The method comprises the following steps of (1) keeping the filter membrane constant in weight,(2) weighing 20 g of a sodium carbonate sample, accurately weighing 0.01 g of the sodium carbonate sample, placing the sodium carbonate sample in a beaker, adding 200 ml of water with a temperature of about 40 DEG C for dissolving, and maintaining the temperature of the experiment solution at 50+ / -5 DEG C,putting the filter membrane with constant weight on a solvent filter,connecting a vacuum pump to begin to filter the sample, and washing the insoluble substance with distilled water of 50+ / -5 DEG C until the color of a washing solution obtained bywashing the insoluble substance with 20ml of distilled water is consistent with that of 20ml of retaken distilled water in a clean beaker when two drops of phenolphthalein indicating liquid are added, putting the filter membrane and the insoluble substances into a high weighing bottle with a corresponding number, and drying in a drying oven at 50+ / -5 DEG C until constant weight, weighing the highweighing bottle by using an analytical balance, and recording the mass value, and (3) calculating a sample determination result. The method is simple and quick to operate and high in accuracy.

Description

technical field [0001] The invention relates to a measuring method, in particular to a method for measuring the water-insoluble content in soda ash by using a microporous membrane. Background technique [0002] Water insoluble matter is an important indicator of sodium carbonate control. The pickling asbestos method is recommended in the "GB / T210.2-2004 Industrial Sodium Carbonate Test Method". [0003] The acid-washed asbestos method requires pre-treatment of pickled asbestos, soaked in hydrochloric acid solution and boiled for 20 minutes, filtered with Buchner funnel and washed to neutrality, then soaked in anhydrous sodium carbonate solution and boiled for 20 minutes, then used Buchner funnel Filter and wash until neutral, make a paste with water, this process takes at least 8 hours. After the acid-washed asbestos has been treated, lay the Gooch's crucible, place the Goo's crucible on the suction filter bottle, spread a layer of pickling asbestos evenly on the top and b...

AI Technical Summary

Problems solved by technology

After the acid-washed asbestos has been treated, lay the Gooch's crucible, place the Goo's crucible on the suction filter bottle, spread a layer of pickling asbestos evenly on the top and bottom of the sieve plate, and press it with a flat-headed glass rod while suctioning and filtering. The thickness of each layer is about 3mm, and then washing and drying are repeated until the constant weight. It takes at least 12 hours, plus 6 hours for the measurement of the sample, to complete the entire operation for at least 26 hours, and there is a large problem because the pore size cannot reach The risk of re-processing paving to the requirements, complex and lengthy

However, the water-insoluble matter in sodium carbonate needs to be measured every batch (24 hours), which cannot meet the needs of daily inspection. Therefore, a more efficient and accurate analysis method must be sought

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