U.S. Geological Survey Certificate of Analysis

Devonian Ohio Shale, SDO-1

SDO-1 is a reference sample which can be used to establish analytical accuracy in the analysis of organic- and sulfur-rich sedimentary rocks. The sample is relatively radioactive, giving counts two four times background over 0-225 feet. It was collected from the Huron Member of the Ohio Shale near Morehead, Kentucky.

Concentrations were determined by cooperating laboratories using a variety of analytical methods. If the results from 5 or more laboratories and 3 or more independent methods are in statistical agreement, concentrations are recommended. Less well-established concentrations are given as averages or ranges (Kane and others, 1990). Concentrations listed are for as-received material.

Recommended Values | Information Values | Range | Certificate Information | Glossary


Oxide Wt % s.d. Oxide Wt % s.d.
Al2O3 12.27 0.23 MnO 0.042 0.005
CaO 1.05 0.047 Na2O 0.38 0.026
Fe2O3 tot 9.34 0.21 P2O5 0.11 0.007
K2O 3.35 0.061 SiO2 49.28 0.63
MgO 1.54 0.038 TiO2 0.71 0.031
Element mg/kg s.d. Element mg/kg s.d.
As 68.5 8.6 Ni 99.5 9.9
Ba 397 38 Pr 8.9 0.66
Ce 79.3 7.8 Rb 126 3.9
Co 46.8 6.3 Sc 13.2 1.5
Cr 66.4 7.6 Sm 7.7 0.81
Dy 6.0 0.65 Sr 75.1 11.0
Eu 1.6 0.22 U 48.8 6.5
Ga 16.8 1.8 V 160 21
La 38.5 4.4 Y 40.6 6.5
Mo 134 21 Yb 3.4 0.46
Nb 11.4 1.2 Zn 64.1 6.9
Nd 36.6 3.3 Zr 165 24

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Information Values

Item Wt % s.d. Item Wt % s.d.
CO2 1.01 0.21 Htot 1.34 0.06
Ctot 9.95 0.44 Ntot 0.347 0.043
Corgcalc 9.68 0.45 Stot 5.35 0.44
Corgmeasured (8.98 - 10.4 range) LOI 21.7 0.0
H2O 1.21 0.50
Element mg/kg s.d. Element mg/kg s.d.
B 128 11 Ho 1.2 0.11
Be 3.3 0.57 Li 28.6 5.5
Cs 6.9 1.2 Lu 0.54 0.14
Cu 60.2 9.6 Pb 27.9 5.2
Er 3.6 0.55 Sn 3.7 1.2
F 697 88.5 Ta 1.1 0.13
Gd 7.4 1.9 Tb 1.2 0.24
Hf 4.7 0.75 Th 10.5 0.55
Hg 0.19 0.08 Tm 0.45 0.08

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Range

Element mg/kg Element mg/kg
Ag 0.094 - 0.17 Ge 1.3
Au 0.002 - 0.0035 In <0.2
Bi 2 - <10 Sb 4.1 - 4.8
Br 5 Se 1.9 - 6.8
Cd <2 - <10 W 3.3

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Certificate Information

Reston, Virginia
August 1991

David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)

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Glossary

Symbol Definition
Fe2O3T Total iron concentration expressed as Fe2O3
Ctot Total carbon concentration 
Cinorgmeasured Inorganic carbon concentration
Corgcalc Total organic carbon calculated (Ctot - Cinorg)
Stot Total sulfur concentration
LOI Loss on ignition
H2O Moisture
Wt % Total element concentration expressed as weight percent
mg/kg Total element concentration expressed as milligrams of element per kilogram of solid sample
± One standard deviation
s.d. One standard deviation

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Order and Pricing Information

This geochemical reference standard is no longer available.

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