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Rapid distillation method and detection method for sulfur dioxide

A technology of sulfur dioxide and distillation method is applied in the field of drug and food safety technology detection, which can solve the problems of time-consuming and affecting the efficiency of detection work.

Active Publication Date: 2021-09-14
北京华澳维科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is widely used in the field of sulfur dioxide detection at home and abroad, but the sample processing process of this method using the nitrogen-filled distillation method takes 90 minutes, which is time-consuming and seriously affects the detection efficiency.

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  • Rapid distillation method and detection method for sulfur dioxide

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Embodiment 1

[0021] Based on the acid-base titration method, this embodiment provides a rapid sulfur dioxide distillation method, which can shorten the sample distillation processing time to 40 minutes, and greatly improve the sample detection efficiency.

[0022] The specific steps for distilling the sample by adopting the rapid distillation method of sulfur dioxide are as follows:

[0023] Step 1, the sample is acidified, and the sulfite series substances in the sample are converted into sulfur dioxide through acid treatment;

[0024] Step 2, carry out nitrogen filling-steam distillation to the sample after acidification treatment, make sulfur dioxide distill out with steam, and obtain distillate after further condensation; In this step, adopt steam distillation to be able to accelerate the separation of sulfur dioxide from the sample speed;

[0025] Step 3, heating the distillate in step 2 to realize gas-liquid separation, release the sulfur dioxide in the distillate, that is, separate...

Embodiment 2

[0028] Based on the quick distillation method of sulfur dioxide in the above-mentioned embodiment 1, the quick detection method of sulfur dioxide is further provided, specifically:

[0029] The above-mentioned embodiment 1 is processed to obtain a solution containing sulfate ions, which is titrated with a sodium hydroxide standard solution, and the content of sulfur dioxide in the sample is calculated according to the consumption of the sodium hydroxide standard solution. That is, the detection sample is distilled to obtain a solution containing sulfate ions for titration detection.

Embodiment 3

[0031] Based on the sulfur dioxide fast distillation method in the above-mentioned embodiment 1, this embodiment provides a sulfur dioxide fast distillation device.

[0032] Such as figure 1 As shown, the distillation device includes: a steam generator 1 , a condenser A5 , a pump 6 , a gas-liquid separation bottle 7 , a heater 8 , a condenser B9 and an absorption bottle 10 . In this example, the condenser A5 adopts a serpentine glass condenser, and the condenser B9 adopts a spherical glass condenser.

[0033] The sample to be detected is placed in the sample bottle 3, and the water vapor generator 1 communicates with the sample bottle 3 through a steam pipe; Reduce condensation and increase output (especially in winter when the ambient temperature is relatively low, steam is easy to condense in the sample bottle 3, and the output of steam will decrease). The pump 6 is used to deliver the hydrochloric acid solution to the sample bottle 3, that is, one end of the pump 6 commun...

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Abstract

The invention relates to the technical field of medicine and food safety technology detection, in particular to a distillation method for sulfur dioxide in food. According to the technical scheme, the rapid distillation method for sulfur dioxide comprises the following steps: acidizing a sample to convert sulfite series substances in the sample into sulfur dioxide; carrying out nitrogen charging-steam distillation on the acidified sample to distill sulfur dioxide along with steam, and conducting condensing to obtain distillate; achieving gas-liquid separation of the distillate, and releasing sulfur dioxide in the distillate; and further condensing and drying the released gaseous sulfur dioxide along with nitrogen, and introducing the dried sulfur dioxide into a hydrogen peroxide solution. By utilizing the method, not only can the rapid distillation of the sample be realized, but also the interference of background substances on titration detection is removed through gas-liquid separation, and the purpose of rapid and accurate detection is realized. Meanwhile, the invention also discloses a sulfur dioxide rapid detection method.

Description

technical field [0001] The invention relates to the technical field of medicine and food safety technology detection, in particular to a distillation method and detection method of sulfur dioxide in food and medicine. Background technique [0002] The "acid-base titration method" stipulated in the Chinese Pharmacopoeia and the national food safety standard draft for comments is one of the main methods for sulfur dioxide detection. Under certain conditions, sulfite and other series of substances release sulfur dioxide, absorb the distillate with hydrogen peroxide solution, the sulfur dioxide in the gas is oxidized to sulfate ion, titrate with sodium hydroxide standard solution, and calculate the sample according to the consumption of sodium hydroxide standard solution content of sulfur dioxide. This method is widely used in the field of sulfur dioxide detection at home and abroad, but the sample processing process of this method using the nitrogen-filled distillation method ...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/40
CPCG01N31/16G01N1/4022G01N2001/4033Y02A50/20
Inventor 寇怀江孙金龙彭红顺白晓彪
Owner 北京华澳维科技有限公司
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