Fig. 1From: Assessment of the effects of phenanthrene and its nitrogen heterocyclic analogues on microbial activity in soilChemical transformation over time in soils amended with different concentrations of phenanthrene and the 3-ring N-PAHs. Data shows: 10 mg kg−1 (filled circle), 100 mg kg−1 (open circle), 250 mg kg−1 (filled down-pointing triangle) and 500 mg kg−1 (open triangle)Back to article page