Assessment of the effects of phenanthrene and its nitrogen heterocyclic analogues on microbial activity in soil

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Table 4 Inhibition (%) by phenanthrene and the 3-ring N-PAHs on CO₂ production in amended soils with glucose addition over time

Chemical	Time (d)	Inhibition (%) by chemical concentration (mg kg⁻¹)
Chemical	Time (d)	10	100	250	500	R²
Phenanthrene	0	5.00	12.50	12.10	15.70	0.926
	30	3.90	3.20	20.70	29.50
	60	12.60	11.40	22.50	31.70
	90	8.40	8.80	17.10	26.60
1,7-Phenantholine	0	37.60	31.00	29.30	27.70	0.932
	30	89.30	41.70	25.90	9.40
	60	4.80	9.30	14.90	66.80
	90	9.80	3.70	1.80	69.90
Benzo[h]quinoline	0	0.40	2.60	6.00	8.70	0.942
	30	8.40	56.50	61.00	49.50
	60	45.60	4.60	9.40	40.50
	90	22.30	23.40	20.60	45.80
4,7-Phenanthroline	0	1.40	4.00	5.60	8.50	0.989
	30	NI	NI	NI	NI
	60	NI	NI	NI	NI
	90	NI	NI	NI	NI

Data shows different chemical concentrations (mg kg⁻¹) and incubation days, respectively
NI no inhibition, R ² correlation coefficient