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The reaction principle for each diffusion tube used in this study2 (Gastec Corp., Kanagawa, Japan).
| Species of Interest | Reaction Principle |
|---|---|
| CO | CO + Na2Pd(SO3)2 → Pd + CO2 + SO2 +Na2SO3 |
| H2S | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH |
| NO2 | NO2 + o-Toluidine → yellow product (unspecified) |
| SO2 | SO2 + BaCl2 + H2O → BaSO3 + 2HCl HCl + Base → Chloride |
| Benzene | Benzene + HCHO → brown product (unspecified) |
