Jonathan W. Martin, J. Franklin, M. Hanson
Jan 15, 2000
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Journal
Environmental Science & Technology
Abstract
Chlorodifluoroacetic acid (CDFA) was detected in rain and snow samples from various regions of Canada. Routine quantitative analysis was performed using an in-situ derivatization technique that allowed for the determination of CDFA by GC−MS of the anilide derivative. Validation of environmental CDFA was provided by strong anionic exchange chromatography and detection by 19F NMR. CDFA concentrations ranged from <7.1 to 170 ng L-1 among all samples analyzed. Monthly volume-weighted CDFA concentrations in rain event samples showed a seasonal trend between June and November 1998, peaking in late summer and decreasing in the fall for Guelph and Toronto sites. Preliminary toxicity tests with the aquatic macrophytes Myriophyllum sibiricum and Myriophyllum spicatum suggest that CDFA does not represent a risk of acute toxicity to these aquatic macrophytes at current environmental concentrations. A degradation study suggests that CDFA is recalcitrant to biotic and abiotic degradation relative to dichloroacetic acid...