Abstract: Swamp or lake water (1 ml/min) was mixed with air (0.32 ml/min) and 10% H2O2 and the stream passed into a UV digester containing a 50 turn 1.5 mm i.d. quartz coil. A flow rate of 2 ml/min allowed a 3.5 min exposure time. CO2 produced was released by passing through a porous PTFE tube (12 cm x 2 mm i.d.). The digested sample stream was spiked with 30 mM NaHCO3 and 24 mM Na2CO3 (0.1 ml/min) and then analyzed by ion chromatography on two columns (no dimensions given) of HPIC-AG3 with a HPIC-AG1 guard column (no dimensions given), 3 mM NaHCO3 and 2.4 mM Na2CO3 as mobile phase (2.5 ml/min). The eluate passed into an anion micromembrane suppressor with 12.5 mM H2SO4 as regenerant (4 ml/min) for detection by conductivity. The calibration graph was linear for 0.2-10 mg/l sulfate with a detection limit of 0.05 mg/l. The RSD improves as the sulfate concentration increases.