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Formaldehyde rapid detection device and manufacturing method thereof

A detection device and technology of formaldehyde, which are applied in the direction of analysis by chemical reaction of materials and material analysis by observing the influence on chemical indicators, can solve the problems of long measurement time, cumbersome operation, and unsuitable for rapid detection, etc. To achieve the effect of simple structure, convenient and safe use, and strong practicability

Inactive Publication Date: 2011-11-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complicated operation and long measurement time
Not suitable for on-site rapid detection

Method used

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  • Formaldehyde rapid detection device and manufacturing method thereof
  • Formaldehyde rapid detection device and manufacturing method thereof
  • Formaldehyde rapid detection device and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition of the formaldehyde rapid detection device of the present invention is illustrated in conjunction with the accompanying drawings.

[0029] Figure 3-6 Among them, 1 is a test strip; 2 is a test strip locator, which can be in the shape of a cuboid, and has a circular hole on the front of the upper part (such as image 3 , 5 ), there is a groove on the back opposite to the circular hole for placing the test strip 1 (such as Figure 4 , 5 ), the lower part can be used as a handle; 4 is the back cover, which can be fastened on the groove on the back of the test paper positioner 2 to fix the test paper 1; 5 is the paper protective cover, which can be covered on the test paper for positioning Protect the test paper piece 1 on the device 2. 3 is the bottom plate, and a white PVC board can be used. Put the test paper piece 1 into the groove of the test paper piece positioner 2 and then put it into the bottom plate 3, and then fasten the back cover 4 to make t...

Embodiment 2

[0032] Further illustrate the manufacturing method of the formaldehyde rapid detection device of the present invention.

[0033] When making test paper sheet 1, the best condition for preparing test paper base liquid is: the concentration of NaOH solution is 3mol / L~8mol / L, KIO 4 The concentration of the solution by mass is 1% to 3%. The dosage ratio of the two is 5:1 by volume.

[0034] When making the color scale card, a formaldehyde content measuring instrument with high accuracy is used, such as the GDYQ-401M four-in-one food safety rapid measuring instrument. When making the color scale card of the formaldehyde content in food, it is stipulated that the color development time after the liquid to be tested is dropped on the test paper sheet is 3 to 5 minutes, and the color system obtained at the selected time within the range of 3 to 5 minutes is used as the color scale The standard color of the card. When making the color scale card of the formaldehyde content in the ai...

Embodiment 3

[0036] Determination of formaldehyde content in food: Use the formaldehyde test paper prepared by the above method to detect a batch of yuba or bean curd that has been added with different concentrations of formaldehyde in advance, so as to judge the practicability of the formaldehyde rapid detection device.

[0037] The same is true for the detection method of formaldehyde content in solid food.

[0038] Soak bean curd sticks or bean curd with different concentrations of formaldehyde in pure water for 20 minutes to obtain food soaking liquid; open the packaging bag, take out the test paper sheet, and drop 1 drop of color developer vertically on the test paper sheet, it will turn slightly yellow, and when the color disappears Then drop the food soaking liquid onto the test paper for 3 minutes, and compare it with the color scale card for color judgment. Then multiply the colorimetric result by the dilution factor (generally 5 times dilution, that is, add purified water to 5mL ...

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Abstract

The formaldehyde rapid detection device and the manufacturing method thereof of the present invention belong to the technical field of toxic substance detection. The composition of the formaldehyde rapid detection device includes a test paper sheet, a color developer and a color scale card; the test paper sheet is a white test paper that is soaked in an aqueous solution composed of sodium hydroxide and potassium periodate and taken out to dry, and the color developer is 4-amino- The solution obtained by dissolving 3-hydrazine-5-mercapto-1,2,4-triazole in hydrochloric acid; the test paper piece (1) can be installed in the test paper piece positioner (2) with a hole on the front and a groove on the back Inside, the groove is fastened with the back cover (4); a white bottom plate (3) is installed between the test paper sheet (1) and the back cover (4). The invention is simple in structure, sensitive in detection, low in price, convenient and safe to use, has the characteristics of simplicity, quickness, intuition, accuracy, practicality, and can be used by all kinds of people by themselves, and is suitable for on-site detection of formaldehyde content in food, water quality and air.

Description

technical field [0001] The invention belongs to the technical field of toxic substance detection, and in particular relates to a simple, quick and on-site semi-quantitative test strip for detecting formaldehyde in food, water quality and air and a manufacturing method for the test strip. Background technique [0002] Formaldehyde is a colorless gas with a strong pungent odor, its chemical formula is HCHO, and it is easily soluble in water, alcohol and ether. Formaldehyde is gaseous at room temperature and usually appears in the form of aqueous solution. Formaldehyde is easily soluble in water and ethanol, and 35-40% formaldehyde aqueous solution is called formalin. There is aldehyde polycondensation reaction in the formaldehyde molecule to obtain phenolic resin (bakelite). Formaldehyde is an important organic raw material, mainly used in the plastic industry (such as phenolic resin, urea-formaldehyde plastic-dianyu), synthetic fiber (such as synthetic vinylon-polyvinyl for...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 宋大千宋丹于爱民高德江孙颖
Owner JILIN UNIV
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