Elemental Compositions and Stable Isotopic Ratios of IHSS Samples

Sample	Cat. No.	H₂O	Ash	C	H	O	N	S	P	δ¹³C	δ¹⁵N
Source: Elemental analyses by Huffman Laboratories, Wheat Ridge, CO, USA; Isotopic analyses by Soil Biochemistry Laboratory, Dept. of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, USA
H₂O content is the %(w/w) of H₂O in the air-equilibrated sample (a function of relative humidity).
Ash is the %(w/w) of inorganic residue in a dry sample.
C, H, O, N, S, and P are the elemental composition in %(w/w) of a dry, ash-free sample.
δ¹³C and δ¹⁵N are the abundances of the respective stable isotopes in units of per mil, or o/oo.
The data for bulk source materials are reported on an as-stored basis, except that %H and %O are corrected for water content.
An * means that a sample is no longer available, and nd means that an item was not determined.
The two available standard aquatic fulvic acids, 1S101F and 2S101F, were isolated from the same location on the Suwannee River, Georgia, U.S.A. in 1982-83 and 2003, respectively.
Standard HA
Suwannee River I *	1S101H	10.0	3.10	52.55	4.40	42.53	1.19	0.58	<0.01	-27.7	-1.41
Suwannee River II	2S101H	20.4	1.04	52.63	4.28	42.04	1.17	0.54	0.013
Elliott Soil	1S102H	8.2	0.88	58.13	3.68	34.08	4.14	0.44	0.24	-22.6	5.34
Pahokee Peat	1S103H	11.1	1.12	56.37	3.82	37.34	3.69	0.71	0.03	-26.0	1.29
Leonardite	1S104H	7.2	2.58	63.81	3.70	31.27	1.23	0.76	<0.01	-23.8	2.13
Standard FA
Suwannee River I	1S101F	8.8	0.46	52.44	4.31	42.20	0.72	0.44	<0.01	-27.6	-1.85
Suwannee River II	2S101F	16.9	0.58	52.34	4.36	42.98	0.67	0.46	0.004	nd	nd
Elliott Soil I *	1S102F	8.8	0.86	50.57	3.77	43.70	2.72	0.56	0.03	-25.4	3.89
Elliott Soil II	2S102F	11.2	1.00	50.12	4.28	42.61	3.75	0.89	0.12	-25.6	5.40
Elliott Soil III	3S102F	nd	2.64	49.79	4.27	44.34	3.25	1.23	0.11	nd	nd
Pahokee Peat I *	1S103F	11.7	4.61	50.45	3.52	45.47	2.56	0.73	0.02	-25.8	1.42
Pahokee Peat II	2S103F	9.3	0.90	51.31	3.53	43.32	2.34	0.76	<0.01	nd	nd
Reference HA
Suwannee River *	1R101H	9.8	3.46	52.89	4.14	43.40	1.17	0.58	<0.01	-28.2	-2.42
Pahokee Peat	1R103H	10.4	1.72	56.84	3.60	36.62	3.74	0.70	0.03	-26.3	1.43
Nordic Lake	1R105H	9.1	0.31	53.33	3.97	43.09	1.16	0.58	0.01	-27.8	-1.55
Summit Hill Soil	1R106H	8.1	1.41	54.00	4.84	37.90	5.13	0.64	0.40	-26.3	2.99
Waskish Peat	1R107H	6.93	1.60	54.72	4.04	38.54	1.47	0.36	0.31	nd	nd
Reference FA
Suwannee River	1R101F	8.9	0.98	53.04	4.36	43.91	0.75	0.46	<0.01	-27.9	-2.76
Pahokee Peat *	1R103F	11.8	1.58	52.12	3.23	43.93	2.43	0.53	0.01	-26.1	0.98
Nordic Lake	1R105F	9.2	0.45	52.31	3.98	45.12	0.68	0.46	<0.01	-27.8	-3.19
Waskish Peat	1R107F	8.29	0.16	53.63	4.24	41.81	1.07	0.29	0.12	nd	nd
Pony Lake	1R109F	4.32	1.25	52.47	5.39	31.38	6.51	3.03	0.55	nd	nd
Aquatic NOM
Suwannee River	1R101N	8.15	7.0	52.47	4.19	42.69	1.10	0.65	0.02	nd	nd
Nordic Lake	1R108N	nd	41.4	53.17	5.67	nd	1.10	nd	nd	nd	nd
Bulk Materials
Elliott Soil	1BS102M	1.52	nd	2.9	nd	nd	0.25	nd	nd	nd	nd
Pahokee Peat	1BS103P	7.1	15	45.70	4.74	nd	3.13	nd	nd	nd	nd
Pahokee Peat II	2BS103P	6.2	12.7	46.90	3.90	30.3	3.42	0.58	nd	-26.6	0.37
Leonardite	1BS104L	10.9	13	49.2	4.52	nd	0.9	nd	nd	nd	nd