Phosphate mixed with bone meal acts as calcium hydrogen phosphate: its color is grayish or yellowish brown, with the smell of animal bone meal, the purpose is to reduce the content of fluorine; when excessive dilute hydrochloric acid is added, a violent reaction occurs and a turbid foam is produced; after the reaction is over , The solution is yellowish, and there are insoluble substances in the bottom layer. The method of detecting nitrogen content can also be used to verify whether it is incorporated into bone meal.
