| http://www.w3.org/ns/prov#value | - Suitable reactant gases include CO2, O2, O3, H2 O, NO. N2 O, NO2, oxides of sulfur, such as SO2, H2, halogen, such as F2, Br2, I2, Cl12 or a source of reactive halogen such as, CCl4, ICl3, HCl, HF, HBr, an oxide of phosphorous such as P2 O5, and mixtures thereof.
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