Why Hydrazine is replace by Carbohydrazide ?
Carbohydrazide (CH6N4O) - RXSOL-42-2541-025 is an oxygen scavenger often added to boiler systems to control corrosion. It reacts with oxygen at low temperatures and pressures. It also passivates metal surfaces preventing further corrosion. The reaction products are volatile, so they do not contribute to dissolved solids in the system. Carbohydrazide is widely used to replace hydrazine as an oxygen scavenger because it is less toxic.
PDT disulfonate; 5,6-Diphenyl-3-(2-pyridyl)-1,2,4-triazine-4′,4″-disulfonic acid sodium salt; 3-(2-Pyridyl)-5,6-bis-(4-Phenylsulfonic acid)-1,2,4-triazine, monosodium salt; 3-(2-Pyridyl)-5,6-diphenyl-1,2,4-triazine-4′,4′′-disulfonic acid sodium salt; 5,6-Diphenyl-3-(2-pyridyl)-1,2,4-triazine-4,4"-disulfonic acid monosodium salt hydrate; 3-(2-Pyridyl)-5,6-diphenyl-1,2,4-triazine-4',4''-disulfonic acid monosodium salt hydrate; PDT-sulfonate mono