concentration in the equilibrium headspace (vapor phase) rather than the liquid phase.
in the liquid phase, which can outgas into storage tank headspaces, creating hazardous environments.
The detection relies on a simple yet effective precipitation reaction. When H2Scap H sub 2 cap S passes through lead acetate ( ) impregnated in the tube, it forms lead sulfide ( PbScap P b cap S ), which is black or brown:
It is valued for being a "field-friendly" method that can be performed quickly outside of a laboratory setting. ASTM International The Test Procedure
it is a common safety procedure used in the petroleum industry to assess the potential for hazardous gas accumulation in storage tank headspaces. ASTM International Key Features of ASTM D5705 Measures the concentration of cap H sub 2 cap S
