: A lead acetate gas detection tube is inserted into the vapor space (close to but not touching the liquid) to measure the concentration based on the length of the stain on the tube. Limitations Phase Focus : It strictly measures vapor-phase . It does not quantify the actual level in the liquid phase, which can be much higher.
ASTM D5705-20 is a standardized, field-applicable method for measuring hydrogen sulfide ( H2Scap H sub 2 cap S astm d5705 pdf