Distribution of 14C-atrazine residues in humus fractions of a Brazilian soil

Fractionation of polycyclic aromatic hydrocarbon residues in soils

“…Concentrations of the desorbing PAH fraction were much higher at 16 weeks in sterilized soils versus nonsterilized treatments. On a whole, the concentrations of this fraction in sterilized soils decreased to some extend after 4 weeks, and then remained nearly constant in [8][9][10][11][12][13][14][15][16] week-incubation (Fig. 2).…”

“…The forms of organic contaminants in soil environments have been reported in literatures [9][10][11][12][13]. Macleod and Semple [8] observed that the extractable fraction of pyrene decreased significantly, whereas the bound residue increased with its contact time in soil.…”