Nitrite test paper

Abstract

The invention discloses nitrite test paper. The nitrite test paper is obtained by soaking filter paper in a mixed solution and then performing drying, wherein the mixed solution is prepared from 3-60 g / L of sulfanilic acid, 20-320 g / L of tartaric acid, 0.1-90 g / L of alpha-naphthylamine, 3-90 g / L of sulfanilamide, 3-50 g / L of N-1-naphthylethylenediamine dihydrochloride and a solvent of water. The soaking time is 1-15 s, and the drying temperature is 0-75 DEG C. The prepared nitrite test paper makes contact with a to-be-detected solution, standing is conducted till color development is stable, the color development condition is observed, comparison is conducted with prepared standard color card, and the nitrite content of the to-be-detected solution is obtained. According to the nitrite test paper, the phenomenon that heating decomposition is conducted on sulfanilic acid can be effectively prevented, the properties of all components are better kept to be unchanged, and meanwhile use of an expensive instrument is reduced. The nitrite test paper is good in water solubility, color development of a test paper reaction is not disturbed, the stability is high, and the speed for detecting nitrite is high. According to the nitrite test paper, the adopted technological process is simple, the equipment is simple, and large-scale production is promoted.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a nitrite detection test paper. Background technique [0002] Nitrite, a general term for a class of inorganic compounds. Mainly refers to sodium nitrite, sodium nitrite is white to light yellow powder or granular, slightly salty taste, easily soluble in water. It is toxic and highly pathogenic, and long-term intake can cause cancer. And nitrite is often used in food as a color-protecting agent and a preservative; a large amount of chemical fertilizers, fuel combustion, and human and animal wastes and other pollutions make nitrite widely distributed in air, soil, water and plants, which is widely present in nature. Nitrite can contaminate food through milk-producing animals and water. Because the appearance of nitrite is very similar to table salt, it is sometimes mistaken for table salt and added to food, thus causing food poisoning. In addition, nitrite is also produ...

AI Technical Summary

Problems solved by technology

Although most of the above methods can detect trace amounts of nitrite more accurately, the operation process is complicated, requiring professionals and expensive instruments, and is not suitable for rapid on-site detection and daily use in households