01331naa a2200145 a 450000100080000000500110000800800410001910000180006024500940007826000090017252009160018165000220109765000160111977300500113515973522003-08-06       1984    bl ---       0--  u    #d1 aSEARLE, P. L.  aThe Berthelot or indophenol reaction and its use in the analytical chemistry of nitrogen.  c1984  aHistorical. Nature of the reaction, mechanism, reagents, phenols, hypohalite sources, catalysts. Reaction conditions, pH dependence, of monochloramine formation, of phenol concentration, of indophenol dissociation, of absorption maxima, of rate of colour development, of colour stability, of gas volatisation and absorption. Reagent concentrations, phenols, hypohalite sources, nitroprusside. Development time and temperature. Order of addition of reagents. Colour stability. Absorption maximum. Sensitivity. Interferences, nitrogen compounds, metals, non-metals, salt effect, light. Solvent extraction methods. Automated methods, reagents, reaction conditions, interferences, analysis rates. Radiochemical methods. Applications, agriculture, clinical, food, waters, metallurgy, petroleum, gases, pharmaceutical products. Conclusions, phenols, hypochlorite source, catalysts, pH, other variables, interferences.  aAnálise Química  aNitrogênio  tAnalyst, Cambridgegv. 109, p. 549-568, 1984.