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Hazards
Published in Rick Houghton, William Bennett, Emergency Characterization of Unknown Materials, 2020
Rick Houghton, William Bennett
Potassium is more reactive than sodium and will react with atmospheric oxygen to form three different oxides: potassium oxide (K2O), potassium peroxide (K2O2), and potassium superoxide (KO2). These higher oxides can react with the base metal or organic materials and burn intensely, or they could be shock sensitive and explode. Use very small amounts of sample when testing. A pH strip wetted with deionized or distilled water will indicate a strong base if placed in the fume emitting from the burning sample.
Mine Rescue
Published in Debi Prasad Tripathy, Mine Safety Science and Engineering, 2019
Chemical oxygen breathing apparatus is suitable for areas where there are high hazard concentrations or where oxygen deficiency may suddenly occur. Most of the chemical oxygen apparatus uses potassium superoxide (KO2) for both the oxygen source and the CO2 absorbent. These are closed-circuit breathing apparatus, which generate oxygen through the reaction of the exhalation air with the chemical. The chemical reacts with the humidity and carbon dioxide of the exhalation air, releasing pure oxygen that fills the breathing bag from which oxygen-containing air is again inhaled. The carbon dioxide of the exhalation air is absorbed without additional auxiliary means.
Effect of trans-ligand on properties of nitric oxide motif in nitrosylcobinamide
Published in Journal of Coordination Chemistry, 2022
Vladimir S. Osokin, Ilia A. Dereven’kov, Sergei V. Makarov, Artiom Gaina-Gardiuta, Radu Silaghi-Dumitrescu
Cyanocobalamin (vitamin B12; ≥ 98%; Sigma-Aldrich), sodium borohydride (≥ 98%; Sigma-Aldrich), imidazole (99%; Alfa Aesar), ethylenediamine (99%; Alfa Aesar), nicotinic acid (≥ 98%; Sigma-Aldrich), sodium nitrite (≥ 98%; Sigma-Aldrich), potassium thiocyanate (≥ 98%; Sigma-Aldrich), potassium superoxide (Alfa Aesar; 96.5%), horseradish peroxidase (Sigma-Aldrich; ≥ 250 unit/mg) and lactoperoxidase (Sigma-Aldrich; ≥ 200 unit/mg) were used as received. Other chemicals were of analytical reagent grade. Oxygen-free argon was used to deoxygenate solutions.