Table 1.

Elemental compositions of the humic materials used in this study.

	Content of Elements, % (Mass Including Ash)				Atomic Ratios
Sample	C	H	N	S	H/C	C/N
CHL	39.2 ± 0.2	3.35 ±0.05	0.97 ±0.03	0.48 ± 0.04	1.0	47
CHP	39.6 ±0.5	3.62 ±0.08	0.91 ± 0.03	0.51±0.01	1.1	51
CHG	38.5 ± 0.3	3.78 ± 0.04	0.76 ± 0.01	0.47 ± 0.03	1.2	59
FA	40.2 ± 0.1	4.29 ± 0.03	0.70 ± 0.01	0.67 ± 0.01	1.3	67