This protocol favors a fast sampling/sample preparation (in situ), minimizes the use of
laboratory material, eliminates the matrix effect from environmental samples, and can be applied to river,
estuarine and oceanic waters. The advantage of detectors in series is that a low sensitivity in detection in one is
compensated by the other. Toluene was the most abundant VOC in the studied area, with an average
concentration of 1.63 μg L−1.