Improved detection method for sulfur dioxide

A sulfur dioxide and detection method technology, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observation of the impact on chemical indicators, can solve problems such as increasing system errors, difficult temperature control, and cumbersome experiments. Achieve the effects of reducing system errors, improving accuracy, and simplifying the experimental process

Inactive Publication Date: 2014-11-19
广州衡创测试技术服务有限公司
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Problems solved by technology

[0003] The distillation method is commonly used to detect sulfur dioxide. The traditional distillation method uses an electric furnace to heat a round bottom flask and connect a condenser tube to cool down. It takes time and effort to build this device, and the temperature is not easy to control, which makes the experiment cumbersome and increases the system error.

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Embodiment Construction

[0023] In order to allow those skilled in the art to understand the present invention more clearly and intuitively, the present invention will be further described below.

[0024] An improved sulfur dioxide detection method, comprising the following steps:

[0025] (1) Sample processing

[0026] Solid samples: Cut the five samples of preserved fruit, fungus, bamboo fungus, sugar, and shiitake mushrooms into fine pieces with a knife or scissors, mix well, and weigh 5.00g of a uniform sample for use;

[0027] (2) Distillation

[0028] Put the sample into the special digestion bottle for Kjeldahl nitrogen determination, add 100mL water, put it on the azotometer, insert the lower end of the absorption tube into the 25mL 20g / L lead acetate absorption solution in the iodine bottle, and then put it in the digestion bottle Add 10mL of 1+1 hydrochloric acid solution, cap the plug immediately, and heat to distill. When the distillation reaches 200mL, keep the lower end of the condense...

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Abstract

The invention provides an improved detection method for sulfur dioxide. The detection method comprises the following steps: treating a sample; placing the sample into a special digestion bottle for Kjeldahl determination, putting the digestion bottle on an azotometer, inserting the lower end of an absorption tube into a lead acetate absorption liquid in an iodine number flask, adding a hydrochloric acid solution, then immediately capping a plug, carrying out heating and distillation and carrying out blank control test during detection; adding concentrated hydrochloric acid and an iodine standard solution into a distilled fluid, placing the obtained mixture in a dark place for a reaction for 2 min, rapidly titrating an excess iodine liquid in the distilled fluid by using a sodium hyposulfite standard solution, adding a starch indicator when the distilled fluid has a light yellow color after titration and terminating titration when a blue color turns into colourless; and calculating the content of sulfur dioxide in the sample according to the consumed amount of sodium hyposulfite. According to the invention, a Kjeldahl determination apparatus is used to replace a manually-built simple distillation apparatus, so the method is simple and easily practicable, reduces system errors and improves accuracy of analysis results.

Description

technical field [0001] The invention relates to an improved sulfur dioxide detection method. Background technique [0002] Sulfite and its salts are commonly used bleaching agents in our country. In many food processing processes, sulfonation and sulfite solution impregnation are often used for bleaching. Sulfur dioxide, the main component of bleaching agents, can cause sore throats and stomach pains for eaters. Adverse reactions such as local discomfort and certain damage to the liver. [0003] Distillation is commonly used to detect sulfur dioxide. The traditional distillation method uses an electric furnace to heat a round-bottom flask and connect a condenser to cool it down. It takes time and effort to set up this device, and the temperature is not easy to control, which makes the experiment cumbersome and increases the system error. Contents of the invention [0004] In view of this, the present invention proposes an improved sulfur dioxide detection method, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 张玉良陈凯松
Owner 广州衡创测试技术服务有限公司
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