Figure 5.

Time courses of nitrate, nitrite, and perfluorooctanoic acid (PFOA) during UV/sulfite treatment of a contaminated groundwater. Line at ∼200 min illustrates the point at which e_aq^– scavenging by the water matrix becomes low enough for PFOA-e_aq reactions to occur. Experimental conditions: 18 W low-pressure Hg lamp, pH₀ = 9.5, 10 mM sulfite, 30 min of sparging with industrial grade N₂, ACE glass water-jacketed immersion well reactors. PFOA concentration was measured according to previously described literature methods.³²