Table T11. Sediment chemistry analyses and corresponding reproducibility.

Table T11. Sediment chemistry analyses and corresponding reproducibility.


Parameter	Method	SCO-1 value		Analytical uncertainty
Parameter	Method	Accepted	Measured	1 (%)	n
Nitrogen	Gas chromatography			5.8	6
Carbon	Gas chromatography			1.5	6
Hydrogen	Gas chromatography			5.3	6
Sulfur	Gas chromatography			BDL
%CaCO₃	Coulometry			1.1	5
SiO₂	ICP-AES	62.78 ± 0.66	64.68	3.4	6
Al₂O₃	ICP-AES	13.67 ± 0.21	13.58	5.0	6
TiO₂	ICP-AES	0.63 ± 0.06	0.61	5.8	6
Fe₂O₃T	ICP-AES	5.13 ± 0.18	5.03	7.1	6
MnO	ICP-AES	0.05 ± 0.003	0.05	2.9	6
CaO	ICP-AES	2.62 ± 0.20	2.52	1.5	6
MgO	ICP-AES	2.72 ± 0.18	2.73	3.9	6
Na₂O	ICP-AES	0.90 ± 0.06	0.92	>20	6
K₂O	ICP-AES	2.77 ± 0.08	2.76	>20	6
Sr	ICP-AES	170 ± 16	168	2.7	6
Ba	ICP-AES	570 ± 30	578	6.9	6
Cr	ICP-AES	68 ± 5	65	>20	6
Ni	ICP-AES	27 ± 4	25	13.1	6
V	ICP-AES	131	129	10.2	6
Y	ICP-AES	26 ± 4	29	8.5	6

Note: Major element oxides are reported as weight percent and trace elements as parts per million. SCO-1 = Cody Shale, a silty shale sediment standard. BDL = below detection limit. ICP-AES = inductively coupled plasma-atomic emission spectroscopy. n = number of analyses. This table is also available in ASCII.