Nitrite detection test paper and its preparing method

A technology for detecting test paper and nitrite, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observation of the influence of chemical indicators. It can solve the problems of expensive instruments and complicated operation methods, and achieve simple production. , low cost, overcome time-consuming and labor-intensive effects

Inactive Publication Date: 2003-11-26
INST OF HYGIENE & ENVIRONMENTAL MEDICINE PLA ACAD OF MILITARY MEDICAL
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Problems solved by technology

Therefore nitrite is all an important detection indicator in aspects such as hygienic examination and environmental protection, has established spectrophotometry, ion chromatography and electrochemical method t...

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  • Nitrite detection test paper and its preparing method
  • Nitrite detection test paper and its preparing method

Examples

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Embodiment 1

[0017] A nitrite detection test paper, comprising a white substrate 1 with a thickness of 1.8mm and made of hard plastic, it also includes a chromogenic paper 2, the chromogenic paper 2 is an ordinary qualitative filter paper passed through 10g / LN-(1 -Naphthyl)-ethylenediamine aqueous solution is fully impregnated, dried at 30°C, drying can be carried out in a drying oven, and then fully immersed in a mixed aqueous solution of 10g / L p-aminobenzenesulfonic acid and 80g / L tartaric acid After that, it is dried in a drying oven at 30° C., and the colored paper sheet 2 is cut into 0.5×0.5 mm, and bonded on the substrate 1 .

Embodiment 2

[0019] A kind of nitrite detection test paper, comprises a thickness 1.5mm, and the white substrate 1 that material is plastics, it also comprises color developing paper 2, and color developing paper 2 is common quantitative filter paper through 25g / LN-(1-naphthalene Base)-Ethylenediamine aqueous solution is fully impregnated, dried at 40°C, drying can be carried out in a drying oven, and then immersed in a mixed aqueous solution of 30g / L p-aminobenzenesulfonic acid and 120g / L tartaric acid, Then dry in a drying oven at 40° C., cut the colored paper sheet 2 into a rectangle, and stick it on the substrate 1 .

Embodiment 3

[0021] A kind of nitrite detection test paper, comprises a white substrate 1 that is 1mm in thickness, and material is plastics, and it also comprises color developing paper 2, and color developing paper 2 is common quantitative filter paper through 20g / LN-(1-naphthyl )-Ethylenediamine aqueous solution is fully impregnated, dried at 35°C, then immersed in a mixed aqueous solution of 20g / L p-aminobenzenesulfonic acid and 100g / L tartaric acid, dried at 35°C, and the color paper The sheet 2 is cut into a size of 0.6×0.8 mm, and bonded on the substrate 1 .

[0022] After a nitrite detection test paper is made, it is sealed and stored in a dry place. It is equipped with a standard colorimetric sample strip and instructions for use. In the test sample, take it out after 5 seconds, and after 1 minute of reaction, compare the discolored test paper sheet with the standard colorimetric sample strip, and then the qualitative and quantitative detection of the nitrite content in the sample...

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Abstract

The present invention discloses nitrite detecting test paper and its preparing process. The nitrite detecting test paper includes substrate and color displaying paper sheet fixed to the substrate. The color displaying paper sheet is prepared with filter paper and through soaking in water solution of N-(1-naphthyl)-vinyl diamine in 10-25 g/L concentration, drying in 30-40 deg.c, soaking in mixedwater solution of sulfanilic acid 10-30 g/L concentration and tartaric acid in 80-120 g/L concentration; and re-drying in 30-40 deg.c. The nitrite detecting test paper is easy to make, low in cost, high in detection precision, good in repeatability and simple in operation, and is used in on-line monitoring of nitrite in food, water and other samples.

Description

technical field [0001] The invention relates to a salt detection test paper and a preparation method thereof, in particular to a nitrite detection test paper and a preparation method thereof. Background technique [0002] Nitrite is a coloring agent, which is widely used in meat products such as cured sausages, sausages and ham, because nitrite can form strong carcinogens with amines under appropriate conditions - nitrous Amines are therefore often regarded as a potential carcinogen. At the same time, in terms of clinical testing, nitrite is known as a blood poison, which can convert hemoglobin in the blood into methemoglobin, and make hemoglobin lose the ability to transport oxygen, thereby causing hypoxia in the body tissue and causing breathing difficulties , Circulatory failure, leading to poisoning, severe cases may even cause death. According to the opinions of the special committee of the United Nations Food and Agriculture and Health Organization (FAO / WHO), the dai...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 高志贤房彦军周焕英王红勇
Owner INST OF HYGIENE & ENVIRONMENTAL MEDICINE PLA ACAD OF MILITARY MEDICAL
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