The common adulterants in fishmeal are blood meal, meat and bone meal, feather meal, cottonseed meal, cottonseed husk, sawdust, dust shell powder, sauce vinegar residue, shell powder, mud sand, etc., which can be identified by the following methods.
1, sensory identification method of high quality pure color powder is yellow or brown, fish smell or fishy flavor, feel loose, uniform particles, and poor quality fish meal was dark brown, there is bad fish flavor and stench smell; Miscellaneous soy sauce slag or salty fish has a salty taste. The mixture of meat and bone powder and leather powder is soft, and the granularity is uneven. The handkerchief that is mixed with cottonseed husks and cottonseed cakes has a velvety feel, and can be lumped into a group. In addition, a smooth, deep-colored hard paper can be used to evenly spread a thin layer of fishmeal sample. The observation of the color is consistent under bright light. If white crystal particles are present, this means that urea or salt is added.
2, the combustion method to take a small amount of fish meal sample enlarged iron spoon and other heat-resistant containers on the heating, such as the issue of dried grains after the aromatic flavor or char smell, indicating that mixed with plant seeds, etc., such as the smell of burning hair is pure fish meal or Doped with animal material.
3. Take a container from the alkali cooking method, add the fishmeal sample and the quantitative 10% potassium hydroxide solution, boil on the fire, dissolve the fishmeal, and dissolve the vegetable material.
4, litmus test paper test method with the combustion method is similar to the fire on the fire after smoking litmus paper test, such as the test paper showed a blue color mixed with plant material, the test paper showed red fish pure fish powder.
5, colorimetry put the fishmeal sample into a clean glass, add 90% alcohol soaking and then drop 1 to 2 drops of concentrated hydrochloric acid, if it is dark red indicates that it is mixed with sawdust, etc., this material is added water and floats in the water. surface.
6. If the magnetic stirring method is suspected to be mixed with iron scraps in the fish meal, it may be stirred by a magnetic bar, and the iron scraps are adsorbed on the surface of the magnetic bar.
1, sensory identification method of high quality pure color powder is yellow or brown, fish smell or fishy flavor, feel loose, uniform particles, and poor quality fish meal was dark brown, there is bad fish flavor and stench smell; Miscellaneous soy sauce slag or salty fish has a salty taste. The mixture of meat and bone powder and leather powder is soft, and the granularity is uneven. The handkerchief that is mixed with cottonseed husks and cottonseed cakes has a velvety feel, and can be lumped into a group. In addition, a smooth, deep-colored hard paper can be used to evenly spread a thin layer of fishmeal sample. The observation of the color is consistent under bright light. If white crystal particles are present, this means that urea or salt is added.
2, the combustion method to take a small amount of fish meal sample enlarged iron spoon and other heat-resistant containers on the heating, such as the issue of dried grains after the aromatic flavor or char smell, indicating that mixed with plant seeds, etc., such as the smell of burning hair is pure fish meal or Doped with animal material.
3. Take a container from the alkali cooking method, add the fishmeal sample and the quantitative 10% potassium hydroxide solution, boil on the fire, dissolve the fishmeal, and dissolve the vegetable material.
4, litmus test paper test method with the combustion method is similar to the fire on the fire after smoking litmus paper test, such as the test paper showed a blue color mixed with plant material, the test paper showed red fish pure fish powder.
5, colorimetry put the fishmeal sample into a clean glass, add 90% alcohol soaking and then drop 1 to 2 drops of concentrated hydrochloric acid, if it is dark red indicates that it is mixed with sawdust, etc., this material is added water and floats in the water. surface.
6. If the magnetic stirring method is suspected to be mixed with iron scraps in the fish meal, it may be stirred by a magnetic bar, and the iron scraps are adsorbed on the surface of the magnetic bar.
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