<Table> Berthelot's reagent <Tr> <Th> Classification </Th> <Td> Colorimetric method </Td> </Tr> <Tr> <Th> Analytes </Th> <Td> Ammonia </Td> </Tr> </Table> <Tr> <Th> Classification </Th> <Td> Colorimetric method </Td> </Tr> <Tr> <Th> Analytes </Th> <Td> Ammonia </Td> </Tr> <P> Berthelot's reagent is an alkaline solution of phenol and hypochlorite, used in analytical chemistry . It is named after its inventor, Marcellin Berthelot . Ammonia reacts with Berthelot's reagent to form a blue product which is used in a colorimetric method for determining ammonia . The reagent can also be used for determining urea . In this case the enzyme urease is used to catalyze the hydrolysis of urea into carbon dioxide and ammonia . The ammonia is then determined with Berthelot's reagent . </P>

In the berthelot method bun is measured by reaction with