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Determination method of sodium chlorate content in sodium hydroxide solution

A technology of sodium hydroxide and determination method, which is applied in the direction of material analysis by observing the influence on chemical indicators, measurement of color/spectral properties, and analysis by chemical reaction of materials, etc., can solve the problem of low accuracy of measurement results, The determination method cannot draw a qualified standard curve, etc., to achieve a good prospect of popularization and application, and the effect of stable determination results.

Active Publication Date: 2021-08-13
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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Problems solved by technology

[0004] The object of the present invention is to provide the assay method of sodium chlorate content in sodium hydroxide solution, to solve the problems such as existing assay method can't draw qualified standard curve, measurement result accuracy is low

Method used

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Embodiment 1

[0022] Embodiment 1 adopts the inventive method to measure sodium chlorate content in sodium hydroxide solution

[0023] 1. Drawing of the standard curve: Take 5ml of reagent sodium hydroxide (400g / l) and place them in seven 100ml volumetric flasks, then add sodium chlorate standard solution (0.01mg / ml) 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0ml, then add 10.0, 9.0, 8.0, 7.0, 6.0, 5.0, 4.0ml of water in turn, and then add 2.0ml of o-toluidine color developing solution (1g / l); at 0-10℃ In the water bath, add hydrochloric acid (analytical pure) dropwise with a graduated pipette, and shake while adding. After the pH reaches 7, quickly add 25ml of hydrochloric acid until the hydrogen ion degree is ≥ 6mol / l. At the same time, keep shaking quickly (the temperature should not exceed 20°C). Remove the volumetric flask from the water bath and shake it up quickly, let it stand for 5 minutes to develop color, then dilute it with water to the mark, shake it up, and let it stand still, select a s...

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Abstract

The invention relates to a method for determining sodium chlorate content in sodium hydroxide solution, belonging to the field of chemical analysis. What the present invention will solve is that existing measuring method can't draw qualified standard curve, the problems such as measuring result accuracy are low, and its technical scheme is to provide the measuring method of sodium chlorate content in sodium hydroxide solution, comprises the steps: a, Take a sample of sodium hydroxide solution, add the chromogen o-toluidine; b, add hydrochloric acid dropwise at 0-10°C to pH=6-8, then quickly add hydrochloric acid until the hydrogen ion concentration in the solution is ≥6mol / l, quickly Keep the temperature below 20°C during the addition, shake well, let stand to develop color, and measure the absorbance; c, calculate the content of sodium chlorate in the sodium hydroxide solution sample according to the absorbance measurement result. The determination method provided by the invention can better draw a standard curve, and the determination result is stable and the accuracy is high.

Description

technical field [0001] The invention relates to a method for determining sodium chlorate content in sodium hydroxide solution, belonging to the field of chemical analysis. Background technique [0002] Sodium hydroxide, also known as caustic soda, is mainly used in the production of paper, soap, dyes, rayon, metal smelting, petroleum refining, cotton fabric finishing, purification of coal tar products, and food processing, wood processing and machinery industries. At present, the production of sodium hydroxide in China mainly adopts the production process of ionic membrane, and the content of sodium chlorate in the caustic soda solution of the ionic membrane is an important index to measure the performance of the ionic membrane, and its accurate detection is of great significance. [0003] The mensuration of sodium chlorate content in caustic soda solution adopts GB / T11200.1-89 and GB / T11200.1-2006 two kinds of national standard mensuration methods at present, and its mode o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/31G01N21/78
Inventor 张芋唐润兵陈映志武松
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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