hydroxylamine concentration decreased from 941 to 526 mg liter 44 decomposed in 30 minutes in test 11 conducted at 90 u00b0 c the hydroxylamine concentration decreased from 985 to 223 mg liter 77 decomposed in only 5 minutes and to 38 mg liter in 30 minutes initial concentrations of ammonia and ph were similar for these two tests further testing was done to determine the effects of the initial hydrogen peroxide concentration on the hydroxylamine decomposition rate in test 12 an initial concentration of 15 4 mm hydrogen peroxide reacted with an initial concentration of 866 mg hydroxylamine liter 26 6 mm u2014 molar ratio of 0 58 1 00 the concentration of hydroxylamine decreased to 316 mg liter after 10 minutes 64 decomposed however a residual concentration of approximately 200 mg liter remained after the reaction was complete 77 decomposed in test 14 an initial concentration of 20 5 mm hydrogen peroxide reacted with an initial concentration of 985 mg hydroxylamine 1 29 8 mm u2014 molar ratio of 0 69 1 00 the concentration of hydroxylamine decreased to 96 mg liter after 10 minutes 90 decomposed with a residual concentration of 3 8 mg liter finally in test 13 an initial concentration of 30 7 mm hydrogen peroxide reacted with an initial concentration of 801 mg hydroxylamine liter 24 3 mm u2014 molar ratio 1.