Fig. 3From: Assessment of the effects of phenanthrene and its nitrogen heterocyclic analogues on microbial activity in soilCumulative CO2 production in 1,7-phenanthroline amended soil following amendment with glucose substrate during the 0–90 days incubation period. Data shows: 0 mg kg−1 (filled square), 10 mg kg−1 (open triangle), 100 mg kg−1 (filled down-pointing triangle), 250 mg kg−1 (open circle) and 500 mg kg−1 (filled circle)Back to article page