5418-32-6Relevant articles and documents
Interference in Determination of Ammonia with the Hypochlorite-Alkaline Phenol Method of Berthelot
Ngo, T. T.,Phan, A. P. H.,Yam, C. F.,Lenhoff, H. M.
, p. 46 - 49 (1982)
The blue color resulting from the formation of indophenol in the Berthelot method of determining ammonia was supressed by primary and secondary amines, sulfides, thiols, and ascorbic acid, and to lesser extent by tertiary amines.We postulate that nucleophilic additions of amines, thiols, and other nucleophiles to the quinoid intermediates of the Berthelot reaction decrease the formation of indophenol.It is also possible that reducing agents deplete hypochlorite to suboptimal levels.
Investigations of the reactions of monochloramine and dichloramine with selected phenols: Examination of humic acid models and water contaminants
Heasley, Victor L.,Fisher, Audra M.,Herman, Erica E.,Jacobsen, Faith E.,Miller, Evan W.,Ramirez, Ashley M.,Royer, Nicole R.,Whisenand, Josh M.,Zoetewey, David L.,Shellhamer, Dale F.
, p. 5022 - 5029 (2008/04/18)
The phenols are an important area of investigation because they are substituents in the humic acids and are common contaminants in water. The reactivities and orientations of two common phenols (phenol and m-cresol), and some of their chlorinated intermediates with aqueous monochloroamine and dichloroamine were presented. m-Cresol was more reactive than phenol with both chlorinating agents. NH2Cl and NHCl2 showed extensive reactivity toward the phenols, even the partially chlorinated less reactive intermediates would be expected to fully chlorinate the activated positions in phenolic substituents in the humic acids.