Table 5.

Main diagnostic ratios for all black crust samples analyzed

Diagnostic ratio	Sample
	GS	AF	GRP	RP	GC
ANT/(ANT + PHE)	0.75	0.63	NC	NC	0.27
BaA/(BaA + CHR)	0.37	0.43	0.46	0.42	0.46
FLA/(FLA + PYR)	0.35	0.24	0.14	NC	NC
BaP/(BaP + CHR)	0.46	0.48	0.54	0.50	NC
FL/(FL + PYR)	0.46	0.33	0.48	NC	NC
PYR/(PYR + BaP)	0.75	0.79	0.71	NC	NC

NC not calculated