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The University of Chicago
The Department of The Geophysical Sciences

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The University of Chicago Stable Isotope Ratio facility

C, N, O, H, S  standards

Disclaimer: Last updated 29 January 2012.  Be sure to actually check the CIAAW website (and links--most current), IAEA website, IAEA stable isotope site,  or NIST website (not Chrome friendly) for the latest values!  This is a variation of the CIAAW site's presentation.  Special thanks to Dominic Colosi for layout and sorting.
Click on the header to sort a column on that value.
Blue-highlighted standards are those available in the lab as of the last update (sort on ref).
Red-highlighted standards are out-of-date values.
Red and Blue lines are UofC and some Yale house standards, not commercially available.
Updates listed, large differences highlighted or listed separately.






Tables by Element
Carbon Nitrogen Hydrogen
Oxygen Sulfur Indiana GCC mixes
Templates and Scripts
Combined Isotope Chart
Links






Carbon
Name NIST
RM #
Composition/Notes δ13CVPDB Ref Error
!!
amt% type
CO2-Biogenic 8564 CO2, modern biomass -10.45 ‰ 2

g
CO2-Heavy 8562 CO2, paleomarine -3.72 ‰ 2

g
CO2-Light 8563 CO2, petrochemical -41.59 ‰ 2

g
Yale SNS Cocoa
powdered baking cocoa -28.42 ‰ -
48.7 o
UofC Cocoa
Nestle Toll House cocoa powder -28.54 ‰ 0.10# 0.03 47 o
UofC Corn flour
Bob's Red Mill Corn flour -11.95 ‰ 0.10# 0.03 39 o
UofC Sorghum
Bob's Red Mill Sorghum -11.31 ‰ 0.10# 0.04 39 o
UofC Paprika
Szeged Hungarian sweet Paprika -27.99 ‰ 0.10& 0.09 48 o
IAEA-303-A
labeled sodium bicarbonate +93.3 ‰ 4

c
IAEA-303-B
labeled sodium bicarbonate +466 ‰ 4

c
IAEA-600
caffeine -27.77 ‰ 2
49.48 o
IAEA-601
benzoic acid -28.81 ‰ 0.2
68.85 o
IAEA-602
benzoic acid -28.85 ‰ 0.2
68.85 o
IAEA-C-1
marble (14C standard) +2.4 ‰ 5

c
IAEA-C-2
travertine (14C standard) -8.3 ‰ 5

c
IAEA-C-3
cellulose (14C standard) -24.9 ‰ 5

o
IAEA-C-4
sub-fossil wood (14C standard) -24.0 ‰ 5

o
IAEA-C-5
sub-fossil wood (14C standard) -25.5 ‰ 5

o
IAEA-C-6
sucrose (14C standard) -10.8 ‰ 5
42.11 o
IAEA-C-7
oxalic acid (14C standard) -14.5 ‰ 6

o
IAEA-C-8
oxalic acid (14C standard) -18.3 ‰ 6

o
IAEA-C-9
sub-fossil wood (14C standard) -23.9 ‰ 7

o
IAEA-CH-3
cellulose -24.72 ‰ 2

o
IAEA-CH-6 8542 sucrose (ANU sucrose, cane sugar) -10.45 ‰ 0.2
42.11 o
IAEA-CH-7 8540 polyethylene foil -32.15 ‰ 0.2
85.63 o
IAEA-CH-7 8540 polyethylene foil (pre-2006) -31.8 ‰ 9
85.63 o
IAEA-CO-1
calcium carbonate +2.49 ‰ 2

c
IAEA-CO-8
calcium carbonate  -5.76 ‰ 2

c
IAEA-CO-9
barium carbonate -47.32 ‰ 2

c
DIC-1

Fisher sodium bicarbonate
  -2.69 ‰ 0.14


b
DIC-2

spiked potassium bicarbonate (may vary)
+18.69‰ 0.14


b
DIC-3

Arm and Hammer baking soda
-16.86 ‰ 0.14


b
LSVEC * 8545 lithium carbonate -46.6 ‰ 2

c
NBS 18 8543 carbonatite -5.01 ‰ 0.2
12 c
NBS 19 * 8544 limestone +1.95 ‰ 0.3 0 12 c
NBS 22 8539 oil -30.03 ‰ 2

o
NBS 22 8539 oil (pre-2006) -29.7 ‰ 8

o
NGS 1 8559 natural gas (coal, CH4) -29.0 ‰ 1

g
NGS 2 8560 natural gas (petroleum, CH4) -44.5 ‰ 1

g
NGS 3 8561 natural gas (biogenic, CH4) -72.8 ‰ 1

g
USGS 24 8541 graphite -16.05 ‰ 2
100 i
USGS 40 8573 L-glutamic acid -26.39 ‰ 0.2 0.09 40.8 o
USGS 41 8574 L-glutamic acid +37.63 ‰ 0.2
40.8 o
USGS 41 8574 L-glutamic acid-our measurement against NBS19 and LSVEC +37.23 ‰ 0.2
40.8 o
IVA urea
IVA urea stable isotope working std -39.79 ‰ 0.9 0.16 20 o
acetanilide
Costech acetanilide (amt% std) -33.86 ‰ 0.10# 0.06 71.1 o
atropine
Costech atropine (amt% std) -22.89 ‰ 0.10& 0.04 70.56 o
Oz-CO2-C-light
Oztech CO2 tank UOC-1787C 2010/08/06 -40.60 ‰ 0.11

g
Oz-CO2-C-med
Oztech CO2 tank UOC-1774C 2010/08/05 -10.41 ‰ 0.11

g
Oz-CO2-C-heavy
Oztech CO2 tank UOC-1766C 2010/07/27 -03.61 ‰ 0.11

g
Yale Trout
Yale ground trout standard -29.00 ‰ -
49.9 o
UofC L-glutamic

-10.52 ‰ 0.12 0.13 40.9 o
UofC casein

-27.05 ‰ 0.12 0.06 47.9 o
EMA casein
Elemental Microanalysis Protein std, B2155 -27.00 ‰ 0.13 0.13 47 o
* Defines the scale

References:  
"0." before number means we have material in house--and can sort them together
1. Hut, G., Consultants' group meeting on stable isotope reference samples for geochemical and hydrological investigations, Vienna, International Atomic Energy Agency, 42 p (1987).
2. Coplen, T.B., Brand, W.A., Gehre, M., Gr�ning, M., Meijer, H. A. J., Toman, B, and Verkouteren, R. M., New guidelines for δ13C measurements, Anal. Chem., 78, 2439-2441 (2006).
3. Gonfiantini, R., 1984, Advisory group meeting on stable isotope reference samples for geochemical and hydrological investigations, IAEA, Vienna, 19-21 September 1983, Report to the Director General, International Atomic Energy Agency, 77 p.
4. Parr R.M., Clements S.A. (1991): Intercomparison of enriched stable isotope reference materials for medical and biological studies, IAEA Report NAHRES-5, International Atomic Energy Agency, 31 pp.
5. Rozanski, K., Stichler, W., Gonfiantini, R., Scott, E.M., Beukens, R.P., Kromer, B., van der Plicht, J. (1992): The IAEA 14C Intercomparison exercise 1990. Radiocarbon, vol. 34, No. 3, pp. 506 519.
6. le Clercq, M., van der Plicht, J, Gr�ning, M. (1998): New 14C reference materials with activities of 15 and 50 pMC. Proceedings of the 16th International 14C Conference. W.G. Mook, J. van der Plicht (eds.), Radiocarbon, vol. 40, No. 1, 1998, pp. 295 279.
7. Scott, E.M., The fourth international radiocarbon intercomparison (FIRI). Radiocarbon, Vol 45, No. 2, 2003, 135-292
8. NIST Standard Reference Materials Catalog, 1998-99.  Trahey, N.M., editor.  January 1998.
9. IVA Analysentechnik e.K. , Meerbusch, Germany; IVA33802174, certificate 147273.  www.iva-analysentechnik.de
10# preliminary results as of 2011/02/23, corrected to USGS 40; & corrected to NBS19
11.
Oztech Trading Corp. (isotopems <at> gmail...)
12. Run on 2011/06/22, corrected to USGS40 and USGS41.
13. Elemental Microanalysis data sheet.
14. Bicarbonate data from 5/2011; reanalysis 11/2011 DIC-2 not for EA analysis, apparent org-c contamination.
!! Error reported for  IAEA, NIST and USGS standards are from interlaboratory comparisons, see references.  The error reported for house standards are from in house runs only (internal precision).
type: g=gas, o=organic, c=carbonate, i=inorganic, b=bicarbonate
(top)
Nitrogen
Name NIST
RM #
Composition/Notes δ15NAIR Ref Error
!!
amt% type
Yale SNS Cocoa
powdered baking cocoa +05.24 ‰ -
4.15 o
IAEA-305-A
labeled ammonium sulfate +39.8 ‰ 4

a
IAEA-305-B
labeled ammonium sulfate +375.3 ‰ 4

a
IAEA-310-A
labeled urea +47.2 ‰ 4
46.6 o
IAEA-310-B
labeled urea +244.6 ‰ 4
46.6 o
UofC Cocoa
Nestle Toll House cocoa powder +06.16 ‰ 0.7# 0.04 4.0 o
UofC Corn flour
Bob's Red Mill Corn flour +03.24 ‰ 0.7# 0.06 1.2 o
UofC Sorghum
Bob's Red Mill Sorghum +04.76 ‰ 0.7# 0.10 1.1 o
UofC Paprika
Szeged Hungarian sweet Paprika +03.29 ‰ 0.7& 0.13 2.7 o
IAEA-311
labeled ammonium sulfate +02.05 ‰ 4

a
IAEA-N-1 * 8547 ammonium sulfate +00.43 ‰ 1

a
IAEA-N-2 8548 ammonium sulfate +20.41 ‰ 1

a
IAEA-NO-3 8549 potassium nitrate +04.72 ‰ 0.1 0.3 13.8 n
NBS 14
gaseous nitrogen -01.18 ‰ 5

g
NSVEC 8552 gaseous nitrogen -02.78 ‰ 1

g
USGS 25 8550 ammonium sulfate -30.41 ‰ 1

a
USGS 26 8551 ammonium sulfate +53.70 ‰ 1

a
USGS 32 * 8558 potassium nitrate +180 ‰ 1 0 13.8 n
USGS 34 8568 potassium nitrate -01.8 ‰ 0.2 0.2 13.8 n
USGS 35 8569 sodium nitrate +02.7 ‰ 2 0.2 16.5 n
USGS 40 8573 L-glutamic acid -04.52 ‰ 0.3 0.12 9.5 o
USGS 41 8574 L-glutamic acid +47.57 ‰ 3
9.5 o
IVA urea
IVA urea stable isotope working std -00.73 ‰ 0.6 0.16 46.6 o
acetanilide
Costech acetanilide (amt% std) -00.86 ‰ 0.7# 0.05 10.4 o
atropine
Costech atropine (amt% std) -06.73 ‰ 0.7& 0.08 4.84 o
Oz-N2
Oztech N2 tank UOC-1792N 2010/08/30 -00.56 ‰ 0.8

g
Yale Trout
Yale gound trout standard +15.70 ‰ -
13.1 o
UofC l-glutamic

-4.75 ‰ 0.9 0.13 9.4 o
UofC casein

+6.11 ‰ 0.9 0.04 13.8 o
EMA casein
Elemental Microanalysis Protein std, B2155 +6.00 ‰ 0.10 0.08 13.5 o
* Defines the scale (interim consensus)

References: 
 "0." before number means we have material in house--and can sort them together
1. B�hlke, J.K., and Coplen, T.B., Interlaboratory comparison of reference materials for nitrogen-isotope-ratio measurements, in Reference and intercomparison materials for stable isotopes of light elements: Vienna, International Atomic Energy Agency, IAEA-TECDOC-825, 51-66 (1995).
2. B�hlke, J.K., Mroczkowski, S. J., and Coplen, T. B., Oxygen isotopes in nitrate: new reference materials for 18O:17O:16O measurements and observations on nitrate-water equilibration, Rapid Comm. Mass Spectrom., 17, 1835-1846 (2003).
3. Qi, H., Coplen, T.B., Geilmann, H., Brand, W. A., and B�hlke, J.K., Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil: Rapid Comm. Mass Spectrom., 17, 2483-2487 (2003).
4. Parr R.M., Clements S.A. (1991): Intercomparison of enriched stable isotope reference materials for medical and biological studies, IAEA Report NAHRES-5, International Atomic Energy Agency, 31 pp
5. "Principles of Stable Isotope Geochemistry" 2007, Appendix A.

6. IVA Analysentechnik e.K. , Meerbusch, Germany; IVA33802174, certificate 147273.  www.iva-analysentechnik.de
7#. preliminary results as of 2011/02/23 vs USGS 40: & run on 2011/02/20
8. Oztech Trading Corp. (isotopems <at> gmail...)
9. Run on 2011/06/22, corrected to USGS40 and USGS41.
10.  Elemental Microanalysis data sheet
!! Error reported for  IAEA, NIST and USGS standards are from interlaboratory comparisons, see references.  The error reported for house standards are from in house runs only (internal precision).
type: g=gas, o=organic, a=ammonium, n=nitrate
(top)
Oxygen
Name NIST
RM #
Composition/Notes δ18OVSMOW Ref Error
!!
amt% type
CO2-Biogenic 8564 CO2, Modern Biomass +20.52 ‰ 5

g
CO2-Heavy 8562 CO2, Paleomarine +11.86 ‰ 5

g
CO2-Light 8563 CO2, Petrochemical -03.64 ‰ 5

g
Yale-DH-3
distilled heavy water +06.60 ‰ -

w
Yale-DI-3
distilled medium water -04.85 ‰ -

w
Yale-DL-3
distilled light water -13.76 ‰ -

w
Yale-Eld
Eldorado bottled water -13.6 ‰ -

w
Florida phosphate 120c carbonate fluorapatite +21.00 ‰ 6

p
Yale-Fiji-3
Fiji bottled water -04.36 ‰ -

w
 GISP 8536 water -24.8 ‰ 0.2

w
Yale-Heavy Evap-3
bath-evaporated water +06.32 ‰ -

w
IAEA-CO-9
barium carbonate +15.04 ‰ 5

c
IAEA-NO-3 8549 potassium nitrate +25.32 ‰ 0.4/9 0.29 47.5 n
IAEA-SO-5
barium sulfate (wet) +12.13 ‰ 4/9 0.33
t
IAEA-SO-6
barium sulfate (wet) -11.35 ‰ 4/9 0.31
t
Yale-ID-3
Idaho water -16.40 ‰ -

w
LSVEC 8545 lithium carbonate +03.69 ‰ 5

c
NBS 18 8543 carbonatite +07.20 ‰ 0.5

c
NBS 19 8544 limestone +28.65 ‰ 0.5

c
NBS 28 8546 silica sand (optical) +09.58 ‰ 2

s
NBS 30 8538 biotite +05.1 ‰ 0.3

sh
NBS 127 8557 barium sulfate +08.59 ‰ 4/9 0.26
t
SLAP * 8537 water -55.50 ‰ 1

w
Yale-TX-3
Texas water -00.82 ‰ -

w
HHO3
house heavy, 03 +01.59 0.14 0.04
w
HL-cs
house light, Chicago snow updated to correct value (was listed as -24.8) -23.80 0.14 0.02
w
LW-2
lake water from IAEA intercomparison study -05.31 0.14 0.03
w
HEN
house enriched (updated for standard in ampules) +34.00 0.14 0.08
w
USGS 32 8558 potassium nitrate +25.40 ‰ 4/13 0.4 47.5 n
USGS 34 8568 potassium nitrate -27.78 ‰ 0.4/9 0.37 47.5 n
USGS 35 8569 sodium nitrate +56.81 ‰ 4/9 0.31 56.5 n
VSMOW2 * 8535 water 00.0 ‰ 1

w
Western phosphate 694 carbonate fluorapatite +13.00 ‰ 6

p
UWG-2
Garnet, Gore Mountain +05.78 ‰ 7

s
Oz-CO2-C-light
Oztech CO2 tank UOC-1787C 2010/08/06 +10.65 ‰ 0.8

g
Oz-CO2-C-med
Oztech CO2 tank UOC-1774C 2010/08/05 +31.25 ‰ 0.8

g
Oz-CO2-C-heavy
Oztech CO2 tank UOC-1766C 2010/07/27 +24.99 ‰ 0.8

g
Phosphate stds
ask  (building up new ones)


15.29 p
Elemental Micro

silver phosphate (will go from bright yellow to brownish)
+21.87 ‰ 0.15
0.16
15.29
p
Alfa Aesar

silver phosphate 99%, house std.
+15.1 ‰ 0.16

15.29
p
Aldrich

silver phosphate, house std.
+10.9 ‰ 0.16

15.29
p
Strem

silver phosphate, house std.
+08.2 ‰ 0.16

15.29
p
IAEA-600
caffeine -03.48 ‰ 9 0.53 16.48 o
IAEA-601
benzoic acid +23.14 ‰ 0.9 0.19 26.2 o
IAEA-602
benzoic acid +71.28 ‰ 0.9 0.36 26.2 o
IAEA-CH-6 8542 sucrose (ANU sucrose, cane sugar) +36.20 ‰ 0.10 0.2 51.41 o
* Defines the scale

References:
  "0." before number means we have material in house--and can sort them together
1. Gonfiantini, R., Standards for stable isotope measurements in natural compounds, Nature, 271, 534-536 (1978).
2. Gonfiantini, R., Stichler, W., and Rozanski, K., Standards and intercomparison materials distributed by the International Atomic Energy Agency for stable isotope measurements, in Reference and intercomparison materials for stable isotopes of light elements, Vienna, Austria, International Atomic Energy Agency, IAEA-TECDOC-825, 13-29 (1995).
3. Coplen, T. B., Kendall, C., and Hopple, J., Intercomparison of stable isotope reference samples, Nature, 302, 236-238 (1983).
4. B�hlke, J. K., Mroczkowski, S. J., and Coplen, T. B., Oxygen isotopes in nitrate: new reference materials for 18O:17O:16O measurements and observations on nitrate-water equilibration, Rapid Comm. Mass Spectrom., 17, 1835-1846 (2003).
5. from CIAAW website: Calculated from data in ref (11) and the relation between VPDB and VSMOW given on page 36 of reference (12).

6. Holmden, C., Papanastassiou, D.A., Wasserburg, G.J., Negative thermal ionization mass spectrometry of oxygen in phosphates. Lunar and Planetary Science XXVIII.  N.B. These were not designed as isotopic standards, some heterogeneity seen in some of the material.  Other reports may have different values.
7. Valley, J.W., Kitchen, N., Kohn, M.J., Niendorf, C.R., Spicuzza, M.J., 1995. UWG-2, a garnet standard for oxygen isotope ratios: strategies for high precision and accuracy with laser heating. Geochim. Cosmochim. Acta 59, 5223– 5231.
8. Oztech Trading Corp. (isotopems <at> gmail...)
9. Brand, W. A., Coplen, T. B., Aerts-Bijma, A. T., B�hlke, J. K., Gehre, M., Geilmann, H., Gr�ning, M., Jansen, H. G., Meijer, H. A. J., Mroczkowski, S. J., Qi, H., Soergel, K., Stuart-Williams, H., Weise, S. M., and Werner, R. A., Comprehensive inter-laboratory calibration of reference materials for δ18O versus VSMOW using various on-line high-temperature conversion techniques, Rapid Comm. Mass Spectrom., 23, 999-1019 (2009).
10. G.D. Farquhar*, B. K. Henry and J. M. Styles, A Rapid On-line Technique for Determination of Oxygen Isotope Composition of Nitrogen-containing Organic Matter and Water, RAPID COMMUNICATIONS IN MASS SPECTROMETRY, VOL. 11, 1554–1560 (1997).  N.B. according to ref 10, sucrose, cellulose, and glutamic acids have exchangeable (absorbed?) O's.  Use may be appropriate for a given study, but use with care.
11. Verkouteren, R. M.; Klinedinst, D.B., Value Assignment and Uncertainty Estimation of Selected Light Stable Isotope Reference Materials:  RMs 8543-8545, RMs 8562-8564, and RM 8566, NIST Special Publication 260-149, National Institute of Standards and Technology, Gaithersburg, Maryland (2004).
12. Coplen, T.B., Hopple, J.A., B�hlke, J.K., Peiser, H.S., Rieder, S.E., Krouse, H.R., Rosman, K.J.R., Ding, T., Vocke, Jr., R.D., R�v�sz, K.M., Lamberty, A., Taylor, P., and De Bi�vre, P., Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents, U.S. Geological Survey Water-Resources Investigations Report 01-4222, 98 p (2001).
13.  from CIAAW website:  Calculated from data in ref (4) and reference (9), as listed here.
14. Results from standardization run can be found here (excel file).
15. from Elemental Microanalysis: their part #180097, http://www.elementalmicroanalysis.com/ is US at http://eaconsumables.com/  Reported error is precision seen in our lab over many runs.
16.  House standards, silver phosphate: run against multiple standards, from earlier silver phosphate to encapsulated water standards.
!! Error reported for  IAEA, NIST and USGS standards are from interlaboratory comparisons, see references.  The error reported for house standards are from in house runs only (internal precision).
type: g=gas, w=water, p=phosphate, n=nitrate, s=silicate, t=sulfate, o=organic, h=hydrous
(top)
Hydrogen
Name NIST
RM #
Composition/Notes δ2HVSMOW Ref Error
!!
amt% type
Yale-DH-3
distilled heavy water +24.3 ‰ -

w
Yale-DL-3
distilled light water -81.3 ‰ -

w
Yale-Eld
Eldorado bottled water -106.4 ‰ -

w
Yale-Fiji-3
Fiji bottled water -40.1 ‰ -

w
GISP 8536 water -190 ‰ 0.2

w
Yale-Heavy Evap-3
bath-evaporated water +00.26 ‰ -

w
IAEA-CH-7 8540 polyethylene foil -100 ‰ 0.2
14.37 o
Yale-ID-3
Idaho water -133.7 ‰ -

w
NBS 22 8539 oil -118 ‰ 3

o
NBS 30 8538 biotite -66 ‰ 0.2

sh
NGS 1 8559 natural gas (coal, CH4) -138 ‰ 3

g
NGS 2 8560 natural gas (petroleum, CH4) -173 ‰ 3

g
NGS 2 8560 natural gas (petroleum, C2H6) -121 ‰ 3

g
NGS 3 8561 natural gas (biogenic, CH4) -176 ‰ 3

g
SLAP2 * 8537 water -428 ‰ 0.1

w
Yale-TX-3
Texas water -20.0 ‰ -

w
VSMOW2 * 8535 water 00.0 ‰ 0.1

w
Oz-H2-light
Oztech H2 tank UOC-1496H 2010/08/10 -189.50 ‰ 0.4

g
Oz-H2-med
Oztech H2 tank UOC-1497H 2010/08/10 -61.18 ‰ 0.4

g
Oz-H2-heavy
Oztech H2 tank UOC-1797H 2010/08/16 +09.46 ‰ 0.4

g

* Defines the scale

References:
 "0." before number means we have material in house--and can sort them together
1. Gonfiantini, R., Standards for stable isotope measurements in natural compounds, Nature, 271, 534-536 (1978).
2. Gonfiantini, R., Stichler, W., and Rozanski, K., Standards and intercomparison materials distributed by the International Atomic Energy Agency for stable isotope measurements, in Reference and intercomparison materials for stable isotopes of light elements, Vienna, Austria, International Atomic Energy Agency, IAEA-TECDOC-825, 13-29 (1995).
3. Hut, G., Consultants' group meeting on stable isotope reference samples for geochemical and hydrological investigations, Vienna, International Atomic Energy Agency, 42 p (1987).

4. Oztech Trading Corp. (isotopems <at> gmail...)
!! Error reported for  IAEA, NIST and USGS standards are from interlaboratory comparisons, see references.  The error reported for house standards are from in house runs only (internal precision).
type: g=gas, w=water, o=organic, s=silicate, h=hydrous
(top)
Sulfur
Name NIST
RM #
Composition/Notes δ34SVCDT Ref Error
!!
amt% type
IAEA-S-1 * 8554 silver sulfide (NZ-1) -00.3 ‰ 2

d
IAEA-S-2 8555 silver sulfide (NZ-1) +22.67 ‰ 3

d
IAEA-S-3
silver sulfide -32.55 ‰ 3

d
IAEA-S-4
Soufre de Laq
8553 elemetal sulfur +16.90 ‰ 1

e
IAEA-SO-5
barium sulfate (wet) +00.49 ‰ 3

t
IAEA-SO-6
barium sulfate (wet) -34.05 ‰ 3

t
NBS 123 8556 sphalerite +17.44 ‰ 4

d
NBS 127 8557 barium sulfate +21.1 ‰ 3

t
* Defines the scale

References:
"h" before number means we have material in house
1. Qi, H.P., and Coplen, Tyler B., Evaluation of the 34S/32S ratio of Soufre de Lacq elemental sulfur isotopic reference material by continuous flow isotope-ratio mass spectrometry, Chem. Geol., 199, 183-187 (2003).
2. Robinson, B.W., Sulphur isotope standards, in Reference and intercomparison materials for stable isotopes of light elements, Vienna, International Atomic Energy Agency, IAEA-TECDOC-825, 39-45 (1995).
3. Coplen, T.B., Hopple, J.A., B�hlke, J.K., Peiser, H.S., Rieder, S.E., Krouse, H.R., Rosman, K.J.R., Ding, T., Vocke, Jr., R.D., R�v�sz, K.M., Lamberty, A., Taylor, P., and De Bi�vre, P., Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents, U.S. Geological Survey Water-Resources Investigations Report 01-4222, 98 p (2001).
4. Zhang, Q.L. (Chang, T.L.) and Ding, T., 1989, Analysis of the reference material NBS‑123 and the atomic weight of sulfur,  Chinese Sci. Bull., 34, 1086-1089 (1989).

!! Error reported for  IAEA, NIST and USGS standards are from interlaboratory comparisons, see references.  The error reported for house standards are from in house runs only (internal precision).
type: t=sulfate, d=sulfide, e=elemental
(top)
Combined Chart
Name NIST
RM #
δ13CVPDB δ15NAIR δ18OVSMOW δ2HVSMOW δ34SVCDT
CO2-Biogenic 8564 -10.45 ‰
+20.52 ‰

CO2-Heavy 8562 -3.72 ‰
+11.86 ‰

DIC-1

  -2.69 ‰



DIC-2

+18.69 ‰



DIC-3

-16.86 ‰



Elemental Micro



+21.87‰

Alfa Aesar



+15.1 ‰

Aldrich



+10.9 ‰

Strem



+08.2 ‰

CO2-Light 8563 -41.59 ‰
-3.64 ‰

Yale-DH


+6.60 ‰ +24.3 ‰
Yale-DI


-4.85 ‰

Yale-DL


-13.76 ‰ -81.3 ‰
Yale-Eld


-13.6 ‰ -106.4 ‰
Florida Phosphate 120c

+21.00 ‰

Yale-Fiji-3


-4.36 ‰ -40.1 ‰
GISP 8536

-24.8 ‰ -190 ‰
Yale-Heavy Evap-3


+6.32 ‰ +0.26 ‰
Yale-SNS Cocoa
-28.42 ‰ +5.24 ‰


UofC Cocoa
-28.54 ‰ +6.16 ‰


UofC Corn flour
-11.95 ‰ +3.24 ‰


UofC Sorghum
-11.31 ‰ +4.76 ‰


UofC Paprika
-27.99 ‰ +3.29 ‰


IAEA-303-A
+93.3 ‰



IAEA-303-B
+466 ‰



IAEA-305-A

+39.8 ‰


IAEA-305-B

+375.3 ‰


IAEA-310-A

+47.2 ‰


IAEA-310-B

+244.6 ‰


IAEA-311

+2.05 ‰


IAEA-600
-27.77 ‰



IAEA-601
-28.81 ‰
+23.14 ‰

IAEA-602
-28.85 ‰
+71.28 ‰

IAEA-C-1
+2.4 ‰



IAEA-C-2
-8.3 ‰



IAEA-C-3
-24.9 ‰



IAEA-C-4
-24.0 ‰



IAEA-C-5
-25.5 ‰



IAEA-C-6
-10.8 ‰



IAEA-C-7
-14.5 ‰



IAEA-C-8
-18.3 ‰



IAEA-C-9
-23.9 ‰



IAEA-CH-3
-24.72 ‰



IAEA-CH-6 8542 -10.45 ‰



IAEA-CH-7 8540 -32.15 ‰

 -100 ‰
IAEA-CO-1
+2.49 ‰



IAEA-CO-8
-5.76 ‰



IAEA-CO-9
-47.32 ‰
+15.04 ‰

IAEA-N-1 8547
+0.43 ‰


IAEA-N-2 8548
+20.41 ‰


IAEA-NO-3 8549
+4.72 ‰ +25.6 ‰

IAEA-S-1 8554



-0.3 ‰
IAEA-S-2 8555



+22.67 ‰
IAEA-S-3




-32.55 ‰
IAEA-S-4 8553



+16.90 ‰
IAEA-SO-5


+12.0 ‰
+0.49 ‰
IAEA-SO-6


-11.3 ‰
-34.05 ‰
Yale-ID-3


-16.40 ‰ -133.7 ‰
LSVEC 8545 -46.6 ‰
+3.69 ‰

NBS 14

-1.18 ‰


NBS 18 8543 -5.01 ‰
+7.20 ‰

NBS 19 8544 +1.95 ‰
+28.65 ‰

NBS 22 8539 -30.03 ‰

-118 ‰
NBS 28 8546

+9.58 ‰

NBS 30 8538

+5.1 ‰ -66 ‰
NBS 123 8556



+17.44 ‰
NBS 127 8557

+8.6 ‰
+21.1 ‰
NGS 1 8559 -29.0 ‰

-138 ‰
NGS 2 (CH4) 8560 -44.5 ‰

-173 ‰
NGS 2 (C2H6) 8560


-121 ‰
NGS 3 8561 -72.8 ‰

-176 ‰
NSVEC 8552
-2.78 ‰


SLAP2 8537

-55.5 ‰ -428 ‰
HH03


+01.59 ‰

HL-cs


-23.80 ‰

LW-2


-05.31

HEN (bottle)


+34.07

Yale-TX-3


-0.82 ‰ -20.0 ‰
USGS 24 8541 -16.05 ‰



USGS 25 8550
-30.41 ‰


USGS 26 8551
+53.70 ‰


USGS 32 8558
+180 ‰ +25.7 ‰

USGS 34 8568
-1.8 ‰ -27.9 ‰

USGS 35 8569
+2.7 ‰ +57.5 ‰

USGS 40 8573 -26.39 ‰ -4.52 ‰


USGS 41 8574 +37.63 ‰ +47.57 ‰


UWG-2


+5.78 ‰

VSMOW2 8535

0.0 ‰ 0.0 ‰
Western Phosphate 694

+13.00 ‰

Elemental Micro


+21.87 ‰

Alfa Aesar



+15.1  ‰

Aldrich



+10.9  ‰

Strem



+ 8.2  ‰

acetanilide
-33.86 ‰ -0.86 ‰


atropine
-22.89 ‰ -6.73 ‰


Oz-H2-light



-189.50
Oz-H2-med



-61.18
Oz-H2-heavy



+09.46
Oz-N2

-00.56


Oz-CO2-C-light
-40.60
+10.65

Oz-CO2-C-med
-10.41
+31.25

Oz-CO2-C-heavy
-03.61
+24.99

UofC l-glutamic acid
-10.52 -4.75


UofC casein
-27.05 +6.11


EMA casein
-27 +6



This chart is simply a combination of each elemental chart above.  Check the above charts for information on the actual material composition of each standard and for the references for each value.

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Templates and scripts (only limited instructions given, and final corrections to standards essential) Water (CO2-water equilibration, gasbench, .xls)  (corrects for relative amounts of CO2 and water, and for temperature)
DIC (Dissolved inorganic carbon, gasbench, also good for DOC, .xls) (13C only)
Carb (carbonates, gasbench, .xls)
Modeling the Measurement: D47-model(.xlsx file)
IsoDat:
turn on ConfloIV dilution to 90% (dil1 and split, e.g. when switching gases) and "no dilution" too

**** Isotopologue scripts*****

for more information, see He, B.; Olack, G.; Colman, A; "Pressure baseline correction and high precision CO2 clumped-isotope (Δ47) measurements in bellows and micro-volume modes"  Rapid Communications in Mass Spectrometry, Volume 26, Issue 24, pages 2837–2853, 30 December 2012
and supporting information too!

Isotopologue scripts (including export template, ISL and R scripts)
export template to pull out isotopologue data (mV data only, need to sort and process to generate 13C, 18O, d47, etc.)

**** Measurement Modeling******
for more informatio, see Olack, G and Colman, A; Modeling the measurement: D47, Corrections, and Absolute Ratios for Reference Materials  Geochemistry, Geophysics, Geosystems, first published, 31 May 2019
and supporting information too (scroll down article page)

contact information: golack <at> uchicago.edu

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Links
Some other standard values that may be of interest:
Isotope reference materials available from Indiana University
CIAAW website
IAEA website

IAEA Stable Isotope site (orders too)
NIST website
Oztech Trading Corp. (isotopems <at> gmail...)
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