Figure 2.
Quantified concentrations (ng L−1) of AEG and DAB in surface water samples with or without 0.1 M TCA, for those samples with concentrations greater than 100 ng L−1 (in the figure x-axis, samples are ranked according to decreasing AEG and DAB concentrations by either method). Due to the ranges of concentrations in environmental samples from different locations, a logarithmic scale was applied to the y-axis. The AEG data below the detection limit of 5 ng L−1 for three samples (rank: 2, 5, and 7) without TCA added; DAB data below the detection limit of 10 ng L−1 for one sample (rank: 16) without TCA added.