Ammonium bisulfite (NH4HSO3), typically used in water solution, is a clear to pale yellow liquid with sulfur dioxide odor. Its most common use in the oil/gas industry is as an oxygen scavenger in seawater flood. It can release sulfur dioxide when mixed with acid or subjected to heat and generate ammonium when mixed with alkalies.

Properties

pH: 4.5-5.5

Specific gravity: 1.3-1.4

Odor: sulfur dioxide

Appearance: Clear to pale yellow liquid

Melting point : 147 °c

Density: 2.03 g/cm³

Uses

It is mainly used as a preservative, reducing agent, and can also be used to make sulfur dioxide, insurance powder, etc.