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Red-highlighted standards are out-of-date values.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	δ¹³C_VPDB	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

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Nitrogen

Name	NIST RM #	Composition/Notes	δ¹⁵N_AIR	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

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Oxygen

Name	NIST RM #	Composition/Notes	δ¹⁸O_VSMOW	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

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Hydrogen

Name	NIST RM #	Composition/Notes	δ²H_VSMOW	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

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Sulfur

Name	NIST RM #	Composition/Notes	δ³⁴S_VCDT	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

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Combined Chart

Name	NIST RM #	δ¹³C_VPDB	δ¹⁵N_AIR	δ¹⁸O_VSMOW	δ²H_VSMOW	δ³⁴S_VCDT
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)

***** Making a Gasbench Needle *****
see: Building a sampling needle

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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