A comparison of N 1s, S 2p and Fe 2p core-level peaks, deconvolution and ratios of their component peaks of the HCN/pyrite surface exposed for different times (0, 7, 40 and 60 days) under air atmosphere conditions.

Assignments			Binding energies (eV)	Coating-free	Time (days)
					0	7	40	60
%	N	N–H/N–C/N C	∼399	—	52	52	52	51
		NH2	∼400	—	42	43	45	42
		NH3+	∼402	—	6	5	4	6
	S	FeS2	∼162	89	90	90	83	73
		Polysulfides	∼164	11	10	10	10	10
		FeSO4	∼168	—	—	—	7	17
	Fe	FeS2	∼707	77	80	81	72	71
		FeO/FeS	∼709	18	13	13	16	11
		Fe2O3/FeOOH	∼711	5	7	6	8	13
		FeSO4	∼713	—	—	—	4	5