Method for preparing primary standard reagent sodium tetraborate

The technology of sodium tetraborate and reagent is applied in the field of preparation of benchmark reagent sodium tetraborate, which can solve the problems of easy water loss, failure to meet the water content standard, poor clarity, etc., and achieve the effects of parallel content and uniform particles.

Active Publication Date: 2009-06-24
TIANJIN CHEM REAGENT RES INST
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Problems solved by technology

The disadvantage of this preparation method is: the finished product of sodium tetraborate still has metal impurities so that the clarity is not good, and it is easy to lose water in air drying so that it cannot meet the water content standard

Method used

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Embodiment Construction

[0018] Below in conjunction with embodiment, the present invention is further described; Following embodiment is illustrative, not limiting, can not limit protection scope of the present invention with following embodiment.

[0019] A kind of preparation method of standard reagent sodium tetraborate, the step of its preparation method is:

[0020] (1). Dissolve 50kg of industrial borax in 200kg of deionized water, heat and dissolve; form borax solution;

[0021] (2). Add sodium carbonate solution in borax solution liquid, reaction temperature 60 ℃, react 1 hour; Add the addition amount of sodium carbonate solution and determine by following way:

[0022] Take 20g of the solution and add sodium carbonate solution until the clarity of the solution is not cloudy; thus determine the amount of sodium carbonate solution added.

[0023] (3). Add 100g of anionic flocculant sodium polyacrylate to the borax solution again, filter after standing for 2 hours, and naturally crystallize; ...

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Abstract

The invention relates to a method for preparing sodium tetraborate as standard reagent. In the method, a sodium carbonate solution and polyacrylate sodium are adopted to remove impurities; and the final drying selects moisture-preserving desiccant, namely a mixture in salt-sugar proportion of 4:1 for drying in a supersaturated state so as to ensure the standard of containing ten crystal waters. A finished sodium tetraborate product is uniform in particles and parallel in content. As the preparation method adopts the polyacrylate sodium which is anionic flocculant, has negative charge and can be combined with metal ion precipitate having positive charge, metal ions can rapidly condense and sink, and the impurity content and clarity can achieve the best effect through filtration. As the moisture-preserving desiccant is selected, the ten crystal waters inside a crystal are stable and no moisture exist outside the crystal so as to ensure that the water content of the finished product achieves the best effect.

Description

technical field [0001] The invention belongs to the field of chemical reagents, and relates to a preparation method of standard reagent sodium tetraborate. Background technique [0002] Standard reagent Sodium tetraborate is used as the quantity and quality transfer reagent of chemical analysis standard solutions in various industries, and it is an indispensable working variable reference material in analysis and detection. In the application process, the standard reagent sodium tetraborate is required to have ten crystal waters, which are difficult to control. At present, the preparation method of the benchmark reagent sodium tetraborate is as follows: under the condition that the temperature is not higher than 60°C, dissolve 140-150g of industrial borax in 300g of water; filter, stir the filtrate continuously with a glass rod to precipitate crystals; Dry it and place it in the air for 2 to 3 days to obtain the finished product of sodium tetraborate. The shortcoming of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12
Inventor 王淑萍
Owner TIANJIN CHEM REAGENT RES INST
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