Technical Bulletin No. 0789: Ammonia Emissions from Kraft Smelt Dissolving Tanks, Slaker Vents, and Causticizer Vents

A stack sampling method for measuring ammonia concentrations in high moisture sources was developed and tested on several kraft causticizing area vents. The sampling train included a heated filter to remove any particulate matter and a series of five chilled midget impingers to remove water and capture the ammonia in solution, followed by ion chromatographic analysis for ammonium ions. Five kraft mills were included in the field study.