Kyushu space analysis method for rapid detection of formaldehyde

I. Overview

Formaldehyde solution commonly known as "formalin" is a kind of primary toxic substance, which has the functions of pseudo-corrosion, stereotype and bleaching. However, it is very harmful to the human body. Ingestion of a small amount can prevent the digestion of gastric enzymes and pancreatic enzymes, affecting metabolic function, because its toxicity is too great, the country has banned the addition of formaldehyde in food.

Second, formaldehyde detection range

Chinese cabbage, beef venetian, beef tendon, tripe, sea bream, sea cucumber, fish skin, duck intestine, duck blood, duck tongue, duck goose, pig's tendon, various fish, shrimp, crab, shellfish and dried sea cucumber Dried aquatic products such as scallops, and aquatic products such as shrimps, fish balls and other dried products, and artificially added formaldehyde in medium water products;

Third, formaldehyde detection steps:

1. Method 1:

(1) Take a small amount of sample and cut it into the sample cup, about 1/2 cup, then add the same amount of distilled water or clean tap water, soak for 10-15 minutes, and pipette the soaking solution 1 tube (about 0.5ml) with a small straw. a sample treatment solution, added to the porous cuvette;

(2) adding 2 drops of A test solution and 2 drops of B test solution to the hole;

(3) After the minute, add 2 drops of the test solution C, and observe the color change of the mixed solution in the cuvette to judge.

2. Method 2:

Both aquatic products and water-based foods have exudates or soaking liquids. A single pipette can be used to directly absorb 1 tube of exudate or soaking liquid of the sample as a sample treatment liquid and added to the porous cuvette;

The following steps are the same as method 1

3. Results judgment:

(1) shows a clear purple color, indicating that the sample is soaked in "formalin", the darker the color, the higher the concentration, and can also be compared with the color card;

(2) No change, yellow or other color, indicating that the sample does not contain formaldehyde;

(3) Displaying a very pale purple-red color, it can be judged that no one is adding formaldehyde;

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