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Updated: Aug 21, 2026

An Experimental Protocol for Studying Mineral Effects on Organic Hydrothermal Transformations
Published on: August 8, 2018
Calorimetric study on the decomposition of hydroxylamine in the presence of transition metals
1National Institute of Industrial Safety, 1-4-6 Umezono Kiyose, Tokyo 204-0024, Japan. miggy@anken.go.jp
Abstract:
Hydroxylamine (HA), hydroxylamine chloride (HAC1), and hydroxylamine nitrate (HAN) were each mixed with aqueous solutions of Cr3+, Cr6+, Mn7+, Co2+, Co3+, and Cu2+, and their heat flow profiles were monitored by a small-scaled reaction calorimeter, SuperCRC. These mixing tests demonstrated that HA was less reactive than HACl and HAN with Mn7+ and Cr6+. Their UV-vis spectra confirmed that the substrates reacted when Mn7+ and Cr6+ were reduced. HA was more reactive with Cu2+ than HAC1 and HAN and exhibited the highest reactivity among the three substrates with regard to metals in the intermediate oxidation states: Cr3+, Co3+, and Co2+. During the reaction of HA and Co3+, an induction period was observed. All exothermic reactions were accompanied by precipitation or a change in the UV-vis spectra.
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