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Boxplots of percent recovery of 10 or 50 µg/L As(III), As(V), dimethylarsinate (DMA), and monomethylarsonate (MMA) spiked into surface water and groundwater a) in the laboratory at the time of analysis and b) in the field at the time of collection. Box center line indicates the median, box edges mark the first and third quartiles, whiskers are 1.5 times the interquartile range, and data outliers are points beyond the whiskers.
