Fish meal is the main source of animal protein feed. Due to the shortage of raw materials for the production of fishmeal in China and the intrinsic quality of fishmeal, it is difficult to identify and adulterate, and the market is more chaotic. Buy fish meal can be carefully identified by the following methods, beware of being taken.
First, the litmus test method: take a small amount of fish meal burning, when there is smoke generated, with wet litmus test paper test, if the test paper appears red, indicating fish meal mixed with vegetable protein raw materials or plant impurities.
Second, the smell of smoke method: Take a small amount of fish meal burning, pure fish meal emits a smell like burning hair; if you emit aromas like burning grain, it proves that the fish meal is not pure.
Third, the heating method: Put about 30 grams of fishmeal in the cup, then add 10 to 15 grams of soy flour and the right amount of water, cover and heat for 15 to 20 minutes, if you open the lid of ammonia, indicating that the fish meal Doped with urea.
Fourth, soaking method: Put a small amount of fishmeal into the cup, then add the concentration of 95% of the alcohol, soak for 15 to 20 minutes, instillation of 1 to 2 drops of concentrated hydrochloric acid, if it shows dark red, indicating that mixed with wood chips.
5. Precipitation method: Put the fishmeal in a beaker, add the appropriate amount of fresh water, and mix the supernatant and filter it. Repeat this many times until only the sediment remains in the cup. Then remove the sediment in the cup and look under the magnifying glass. If the fish meal is mixed with sand, it is easy to find.
Sixth, alkali dissolution reaction method: Set fishmeal boiled in 10% potassium hydroxide solution, can be dissolved as a true fish meal, can not be dissolved as a fake fish meal, insoluble substances that are adulterated in fish meal.
First, the litmus test method: take a small amount of fish meal burning, when there is smoke generated, with wet litmus test paper test, if the test paper appears red, indicating fish meal mixed with vegetable protein raw materials or plant impurities.
Second, the smell of smoke method: Take a small amount of fish meal burning, pure fish meal emits a smell like burning hair; if you emit aromas like burning grain, it proves that the fish meal is not pure.
Third, the heating method: Put about 30 grams of fishmeal in the cup, then add 10 to 15 grams of soy flour and the right amount of water, cover and heat for 15 to 20 minutes, if you open the lid of ammonia, indicating that the fish meal Doped with urea.
Fourth, soaking method: Put a small amount of fishmeal into the cup, then add the concentration of 95% of the alcohol, soak for 15 to 20 minutes, instillation of 1 to 2 drops of concentrated hydrochloric acid, if it shows dark red, indicating that mixed with wood chips.
5. Precipitation method: Put the fishmeal in a beaker, add the appropriate amount of fresh water, and mix the supernatant and filter it. Repeat this many times until only the sediment remains in the cup. Then remove the sediment in the cup and look under the magnifying glass. If the fish meal is mixed with sand, it is easy to find.
Sixth, alkali dissolution reaction method: Set fishmeal boiled in 10% potassium hydroxide solution, can be dissolved as a true fish meal, can not be dissolved as a fake fish meal, insoluble substances that are adulterated in fish meal.
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