Fig. 4.

Determination of recovery rates of standard sugars applied to different substrates in a glass vial (10 μg of each sugar per vial). Example (total ion chromatograms) TIC of recovered compounds from sand, vermiculite, and a processed (sieved and heated) fraction of field soil compared to a standard mix in water (N = 4). Trimethylsilyl derivatives of arabinose, xylose and glucose were each represented by two peaks, a phenomenon that is commonly observed in gas chromatograms of silylated monosaccharides (Medeiros and Simoneit 2007)