Effects of Different Water Seasons on the Residual Characteristics and Ecological Risk of Polycyclic Aromatic Hydrocarbons in Sediments from Changdang Lake, China

Table 2

The reference standard of PAHs source identification for ratio method.

	Petrogenic origin	Petroleum combustion	Combustion of biomass and coal	Reference
Ant/(Ant + Phe)	<0.10	>0.10	>0.10	[14]
Group of sites	All of the sampling sites
Fla/(Fla + Pyr)	<0.40	0.50 > > 0.40	>0.50	[20, 21]
Group of sites	M1, M2, M3, M6, and J6	J1, J4, J5, S1, S5, and S6	Other sampling sites
BaA/(BaA + Chr)	<0.20	0.35 > > 0.20	>0.35	[14]
Group of sites; S2 and S4	M1, M4	J4 and J5	Other sampling sites