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Ammonia nitrogen is a basic indicator value for water quality monitoring earlier. Why is ammonia nitrogen used as a criterion for evaluating the quality of water bodies? Because the amount of ammonia nitrogen in the water body has a significant positive correlation with the eutrophication of the water body. A water body with high ammonia nitrogen has a high level of eutrophication. The ammonia nitrogen that we generally test is the collective name of ammonium ion (NH4+) and non-ionic ammonia (NH3) in water. Nitrogen in the water body comes from the feed fed
One of the key indicators of standard feed is the protein content. The protein in the feed is digested by fish and shrimp after being ingested, and most of it is metabolized into the water body. This part of the protein will be dissolved into ammonia nitrogen and nitrate nitrogen in an inorganic state under the effect of bacteria. These two parts of nitrogen are finally used by algae and microbial species to enter the material cycle again. Symptoms of chronic ammonia nitrogen poisoning in fish
1. The food intake of the fish is reduced. The time is short, or the food will disperse after a while, and the fish will swim around to eat the foam;
2. On rainy days, top fish, such as silver carp, float on the river for a long time, and bottom fish, such as carp, eat slowly, which will lead to rotten gills for a long time.
Farms should always pay attention to the ammonia nitrogen index value of the water body. It is strongly recommended to use a portable ammonia nitrogen water quality detector to carry out regular testing of the water body. Sample and save
Clean glass or plastic containers should be used for sample collection. Analysis cannot be performed immediately, adjust the pH of the sample with hydrochloric acid to≤2 Save. Store samples at 4°C (ie, 39°F). The pH of the samples was adjusted to 7.0 prior to the test analysis. Correct the test results based on the increase in the sample volume. sample pretreatment
If the sample is turbid, it is recommended to perform flocculation and precipitation. If the sample has a high chromaticity, it should be noted that the sample without any reagents can be selected as a blank. If the sample contains organic amines, it may affect the measurement of the Nessler method. Distillation pretreatment is recommended.
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