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Below is a list of reference materials used at IsoLab.

View a table of informal survey results conducted through IsoGeoChem to obtain reasonable estimates of δ15N and δ13C values for the NIST1547 Peach Leaves material:

View a table of all laboratories that have measured O2 gas from a compressed cylinder originating from Praxair in Seattle, Washington, the results they obtained, and information provided about their reference materials:

Reference Materials for Carbonate δ13C δ18O

Kiel device / Clumped Isotopes

Reference
Material
δ13C
VPDB (permil)
δ18O
VPDB (permil)
Material
NBS19 1 +1.95 -2.2 limestone
LSVEC 1 -46.6 lithium carbonate
NBS18 -5.01 -23.01 carbonatite
IAEA-603 +2.47 -2.37 calcium carbonate
C1 +2.54 -0.42 marble
C2 8 -48.99 -16.47 calcium carbonate
CQS2 -2.15 -15.34 calcium carbonate
C64 -2.05 -15.54 calcium carbonate
Coral -2.14 -4.50 aragonite

Reference Materials for Nitrate δ15N δ18O Δ17O

Bacterial denitrifier method

Reference
Material
δ15N
Air N2(‰)
Δ17O
VSMOW (‰)
δ18O
VSMOW (‰)
Material
IAEA-NO-3 +4.72 -0.2 +25.32 potassium nitrate
USGS32 6 +180 +25.4 potassium nitrate
USGS34 -1.8 -0.1 -27.78 potassium nitrate
USGS35 +2.5 +21.6 +56.81 sodium nitrate
USGS34 / 35mix +0.45 +10.75 USGS34 / USGS35 50:50 mixture

Reference Materials for Sulfate Δ17O

Silver sulfate pyrolysis, in-house designer standards

Reference
Material
Δ17O
VSMOW (permil)
Material
sulfα 5 0.9 sodium sulfate
sulfβ 5 2.0 sodium sulfate
sulfε 5 7.0 sodium sulfate

Reference Materials for Solid δ13C δ15N δ34S

Reference MaterialRef. Material δ13C
VPDB (‰)
δ15N
Air N2 (‰)
δ34S
VCDT (‰)
Material
IAEA-N-1 6   +0.43   ammonium sulfate
NIST 8540 -32.15     polyethylene foil
NIST 8542 Sucrose -10.45     Sucrose
USGS40 L-glutamic acid -26.39 -4.52   L-glutamic acid
USGS41 L-glutamic acid +37.63 +47.57   L-glutamic acid
NIST 1547 4 peach leaves -25.99 +1.98   peach leaves
GA1 glutamic acid -28.3 -4.6   glutamic acid
GA2 glutamic acid -13.7 -5.7   glutamic acid
Salmon Bristol Bay Sockeye -21.3 11.3   Bristol Bay Sockeye
MAL Malachite Lake Sediment -26.5 -0.4 +8.3 Malachite Lake Sediment
IAEA-S-1 2 silver sulfide     -0.3 silver sulfide
IAEA-S-3 silver sulfide     -32.55 silver sulfide
NBS-127 barium sulfate     +21.1 barium sulfate
Ag2S silver sulfide     +17.60 silver sulfide
ZnS zinc sulfide     -32.31 zinc sulfide
BaSO4 barium sulfate     +4.59 barium sulfate

Reference Materials for Water δD δ18O 17Oexcess

Reference
Material
Ref.
Material
δD
VSMOW (‰)
17Oexcess17Oexcess
VSMOW
(permeg)
VSMOW
(permeg)
δ18O
VSMOW (‰)
Material
VSMOW 3VSMOW3
Vienna Standard Mean Ocean Water
0 0 0 Vienna Standard Mean Ocean Water
VSMOW2 3VSMOW2
Vienna Standard Mean Ocean Water
0 0 0 Vienna Standard Mean Ocean Water
GISPGISP
Greenland Ice Sheet P. Water
-189.7 25 -24.78 Greenland Ice Sheet Precipitation Water
GISP2GISP2
Greenland Ice Sheet P. Water
-258.3   -33.43 Greenland Ice Sheet Precipitation Water
SLAP 3,7 Standard Light Antarctic P. Water -428 0 -55.5 Standard Light Antarctic Precipitation Water
SLAP2 3,7 Standard Light Antarctic P. Water -427.5 0 -55.5 Standard Light Antarctic Precipitation Water
USGS PR USGS Puerto Rico Water -1.3   -1.52 USGS Puerto Rico Water
USGS A1 USGS Antarctic Water -395   -50.02 USGS Antarctic Water
RW Ev. enriched Seattle Water -18.52   +5.15 Evaporatively enriched Seattle Water
KD Kona Deep 0.65 -3 0 Kona Deep drinking water
PW Penn. Water -42.12 30 -6.88 Pennsylvania Water
SW Seattle Water -75.63 33 -10.55 Seattle Water
BW ITASE / Seattle Water -156.87 13 -20.01 ITASE / Seattle Water
AW Antarctic Water -231.54   -29.79 Antarctic Water
WW WAIS Water -268.30 25 -33.82 WAIS Water
CW WDC06A Water NICL 2009 -265.95   -33.64 WDC06A Water NICL 2009
TDW Taylor Dome Water -309.49   -38.76 Taylor Dome Water
WGW WDC06A Water Last Glacial Period -318.82 14 -39.77 WDC06A Water Last Glacial Period
SVW Seattle / Vostok Water -316.59   -41.13 Seattle / Vostok Water
SPS South Pole Snow -365.01 15 -46.96 South Pole Snow
SPG South Pole Glacial -435.31 -11 -55.39 South Pole Glacial
VW Vostok Water -439.24 0 -56.61 Vostok Water
O2 gas Oxygen in comp. gas cylinder   48.4 -8.26 Oxygen in compressed gas cylinder

Reference Material - O2 Gas Laboratory Comparison

 

O2 gas from a compressed cylinder originating from Praxair in Seattle, Washington.

Here is a table of all laboratories that have measured this gas, the results they obtained, and information provided about their reference materials. The ± symbol indicates standard deviation. 17O excess was calculated as (ln (δ 17O/1000 + 1) - 0.528 × ln(δ18O/1000 + 1) ) × 1,000,000 and are in units of permeg.

Laboratory Number δ17O (‰) δ17O (‰) δ18O (‰) δ18O (‰) 17O excess (per meg) 17O excess (per meg) Reference Gas δ17O (‰) Ref. Gas δ17O (‰) Reference Gas δ18O (‰) Ref. Gas δ18O (‰)
1 -4.52 ± 0.023 -4.52 ± 0.023 -8.55 ± 0.052 -8.55 ± 0.052 4.24 4.24 23.70 23.70 46.13 46.13
2 -4.45 ± 0.022 -4.45 ± 0.022 -8.60 ± 0.017 -8.60 ± 0.017 100.51 100.51 unk unk unk unk
3 -4.32 ± 0.009 -4.32 ± 0.009 -8.26 ± 0.015 -8.26 ± 0.015 48.38 48.38 -7.02 -7.02 -13.38 -13.38
4 -4.21 ± 0.068 -4.21 ± 0.068 -8.08 ± 0.092 -8.08 ± 0.092 66.06 66.06 12.53 12.53 24.56 24.56
5 -4.17 ± 0.044 -4.17 ± 0.044 -7.89 ± 0.025 -7.89 ± 0.025 7.20 7.20 8.84 8.84 17.56 17.56
6 -4.4918 -4.4918 -8.555 -8.555 34.6 34.6 0 0 0 0

Reference Material - NIST1547 Peach Leaves

Below is an informal survey conducted through IsoGeoChem to obtain reasonable estimates of δ15N and δ13C values for the NIST1547 Peach Leaves material. The specific inquiry to IsoGeoChem can be found here. Information about this material beyond this page can be obtained from the NIST domain. A direct link to the formal certificate from the NIST page for this material is here as a pdf. If you would like to add yourself to this anonymous survey, please contact us. The mean and standard deviation for δ15N and δ13C for the survey are emphasized in the first row of the table below. Please note, some submissions are individual samples, some are previously conducted surveys and represent a compilation. The summary values below are in no way accepted by the community but simply represent values obtained during routine analysis.

Anonymous Lab Number Average
δ13C vs VPDB
(‰)
Standard Deviation
δ13C
(‰)
Sample Size
δ13C
Average
δ15N vs AirN2
(‰)
Standard Deviation
δ15N
(‰)
Sample Size
δ15N
Survey -25.99 0.18   1.98 0.21  
1 -26.03 0.21 50 2.00 0.10 10
2 -25.90 0.02 3 1.80 0.06 3
3 -25.89 0.13   1.89 0.15  
4 -26.00 0.19 5 1.80 0.16 5
5       2.00 0.09 7
6 -25.90 0.05 12 2.40 0.22 12
7 -26.19 0.01 3 1.92 0.07 3
8 -25.88 0.06   2.25 0.23  
9 -25.79 0.14   1.72 0.08  
10 -25.93 0.07 475 1.92 0.14 407
11 -25.80     1.90    
12 -26.03 0.16 10 1.98 0.27 10
13 -26.50     1.80    
14       2.20 0.08 5
15 -25.90 0.05 12 1.90 0.23 12
16 -26.30   2 2.10 0.04 3
17 -25.90 0.03 5 1.90 0.02 5
18 -26.00 0.26 4 2.50 0.12 4
19       1.80 0.20 10
20 -25.97 0.12   1.87 0.13  

Reference Material Footnotes

1 - exact values defining the VPDB delta scale
2 - exact value defining the VCDT delta scale
3 - exact values defining the VSMOW delta scale
4 - NOT accepted, Lithium carbonate acid fractionation not well known, this value assumes calcium carbonate acid fractionation
5 - Schauer et al. Rapid Commun. Mass Spectrom. 2012, 26, 2151-2157. DOI: 10.1002/rcm.6332
6 - interim consensus values used for AirN2 scale normalization
7 - Schoenemann et al. Rapid Commun. Mass Spectrom. 2013. DOI: 10.1002/rcm.6486
8 - C2 is Merck Suprapur Calcium carbonate product number 1020590050 (50 g bottle)

Below is a list of reference materials used at IsoLab.

View a table of informal survey results conducted through IsoGeoChem to obtain reasonable estimates of δ15N and δ13C values for the NIST1547 Peach Leaves material:

View a table of all laboratories that have measured O2 gas from a compressed cylinder originating from Praxair in Seattle, Washington, the results they obtained, and information provided about their reference materials:

Reference Materials for Carbonate δ13C δ18O

Kiel device / Clumped Isotopes

Reference
Material
δ13C
VPDB (permil)
δ18O
VPDB (permil)
Material
NBS19 1 +1.95 -2.2 limestone
LSVEC 1 -46.6 lithium carbonate
NBS18 -5.01 -23.01 carbonatite
IAEA-603 +2.47 -2.37 calcium carbonate
C1 +2.54 -0.42 marble
C2 8 -48.99 -16.47 calcium carbonate
CQS2 -2.15 -15.34 calcium carbonate
C64 -2.05 -15.54 calcium carbonate
Coral -2.14 -4.50 aragonite

Reference Materials for Nitrate δ15N δ18O Δ17O

Bacterial denitrifier method

Reference
Material
δ15N
Air N2(‰)
Δ17O
VSMOW (‰)
δ18O
VSMOW (‰)
Material
IAEA-NO-3 +4.72 -0.2 +25.32 potassium nitrate
USGS32 6 +180 +25.4 potassium nitrate
USGS34 -1.8 -0.1 -27.78 potassium nitrate
USGS35 +2.5 +21.6 +56.81 sodium nitrate
USGS34 / 35mix +0.45 +10.75 USGS34 / USGS35 50:50 mixture

Reference Materials for Sulfate Δ17O

Silver sulfate pyrolysis, in-house designer standards

Reference
Material
Δ17O
VSMOW (permil)
Material
sulfα 5 0.9 sodium sulfate
sulfβ 5 2.0 sodium sulfate
sulfε 5 7.0 sodium sulfate

Reference Materials for Solid δ13C δ15N δ34S

Reference MaterialRef. Material δ13C
VPDB (‰)
δ15N
Air N2 (‰)
δ34S
VCDT (‰)
Material
IAEA-N-1 6   +0.43   ammonium sulfate
NIST 8540 -32.15     polyethylene foil
NIST 8542 Sucrose -10.45     Sucrose
USGS40 L-glutamic acid -26.39 -4.52   L-glutamic acid
USGS41 L-glutamic acid +37.63 +47.57   L-glutamic acid
NIST 1547 4 peach leaves -25.99 +1.98   peach leaves
GA1 glutamic acid -28.3 -4.6   glutamic acid
GA2 glutamic acid -13.7 -5.7   glutamic acid
Salmon Bristol Bay Sockeye -21.3 11.3   Bristol Bay Sockeye
MAL Malachite Lake Sediment -26.5 -0.4 +8.3 Malachite Lake Sediment
IAEA-S-1 2 silver sulfide     -0.3 silver sulfide
IAEA-S-3 silver sulfide     -32.55 silver sulfide
NBS-127 barium sulfate     +21.1 barium sulfate
Ag2S silver sulfide     +17.60 silver sulfide
ZnS zinc sulfide     -32.31 zinc sulfide
BaSO4 barium sulfate     +4.59 barium sulfate

Reference Materials for Water δD δ18O 17Oexcess

Reference
Material
Ref.
Material
δD
VSMOW (‰)
17Oexcess17Oexcess
VSMOW
(permeg)
VSMOW
(permeg)
δ18O
VSMOW (‰)
Material
VSMOW 3VSMOW3
Vienna Standard Mean Ocean Water
0 0 0 Vienna Standard Mean Ocean Water
VSMOW2 3VSMOW2
Vienna Standard Mean Ocean Water
0 0 0 Vienna Standard Mean Ocean Water
GISPGISP
Greenland Ice Sheet P. Water
-189.7 25 -24.78 Greenland Ice Sheet Precipitation Water
GISP2GISP2
Greenland Ice Sheet P. Water
-258.3   -33.43 Greenland Ice Sheet Precipitation Water
SLAP 3,7 Standard Light Antarctic P. Water -428 0 -55.5 Standard Light Antarctic Precipitation Water
SLAP2 3,7 Standard Light Antarctic P. Water -427.5 0 -55.5 Standard Light Antarctic Precipitation Water
USGS PR USGS Puerto Rico Water -1.3   -1.52 USGS Puerto Rico Water
USGS A1 USGS Antarctic Water -395   -50.02 USGS Antarctic Water
RW Ev. enriched Seattle Water -18.52   +5.15 Evaporatively enriched Seattle Water
KD Kona Deep 0.65 -3 0 Kona Deep drinking water
PW Penn. Water -42.12 30 -6.88 Pennsylvania Water
SW Seattle Water -75.63 33 -10.55 Seattle Water
BW ITASE / Seattle Water -156.87 13 -20.01 ITASE / Seattle Water
AW Antarctic Water -231.54   -29.79 Antarctic Water
WW WAIS Water -268.30 25 -33.82 WAIS Water
CW WDC06A Water NICL 2009 -265.95   -33.64 WDC06A Water NICL 2009
TDW Taylor Dome Water -309.49   -38.76 Taylor Dome Water
WGW WDC06A Water Last Glacial Period -318.82 14 -39.77 WDC06A Water Last Glacial Period
SVW Seattle / Vostok Water -316.59   -41.13 Seattle / Vostok Water
SPS South Pole Snow -365.01 15 -46.96 South Pole Snow
SPG South Pole Glacial -435.31 -11 -55.39 South Pole Glacial
VW Vostok Water -439.24 0 -56.61 Vostok Water
O2 gas Oxygen in comp. gas cylinder   48.4 -8.26 Oxygen in compressed gas cylinder

Reference Material - O2 Gas Laboratory Comparison

 

O2 gas from a compressed cylinder originating from Praxair in Seattle, Washington.

Here is a table of all laboratories that have measured this gas, the results they obtained, and information provided about their reference materials. The ± symbol indicates standard deviation. 17O excess was calculated as (ln (δ 17O/1000 + 1) - 0.528 × ln(δ18O/1000 + 1) ) × 1,000,000 and are in units of permeg.

Laboratory Number δ17O (‰) δ17O (‰) δ18O (‰) δ18O (‰) 17O excess (per meg) 17O excess (per meg) Reference Gas δ17O (‰) Ref. Gas δ17O (‰) Reference Gas δ18O (‰) Ref. Gas δ18O (‰)
1 -4.52 ± 0.023 -4.52 ± 0.023 -8.55 ± 0.052 -8.55 ± 0.052 4.24 4.24 23.70 23.70 46.13 46.13
2 -4.45 ± 0.022 -4.45 ± 0.022 -8.60 ± 0.017 -8.60 ± 0.017 100.51 100.51 unk unk unk unk
3 -4.32 ± 0.009 -4.32 ± 0.009 -8.26 ± 0.015 -8.26 ± 0.015 48.38 48.38 -7.02 -7.02 -13.38 -13.38
4 -4.21 ± 0.068 -4.21 ± 0.068 -8.08 ± 0.092 -8.08 ± 0.092 66.06 66.06 12.53 12.53 24.56 24.56
5 -4.17 ± 0.044 -4.17 ± 0.044 -7.89 ± 0.025 -7.89 ± 0.025 7.20 7.20 8.84 8.84 17.56 17.56
6 -4.4918 -4.4918 -8.555 -8.555 34.6 34.6 0 0 0 0

Reference Material - NIST1547 Peach Leaves

Below is an informal survey conducted through IsoGeoChem to obtain reasonable estimates of δ15N and δ13C values for the NIST1547 Peach Leaves material. The specific inquiry to IsoGeoChem can be found here. Information about this material beyond this page can be obtained from the NIST domain. A direct link to the formal certificate from the NIST page for this material is here as a pdf. If you would like to add yourself to this anonymous survey, please contact us. The mean and standard deviation for δ15N and δ13C for the survey are emphasized in the first row of the table below. Please note, some submissions are individual samples, some are previously conducted surveys and represent a compilation. The summary values below are in no way accepted by the community but simply represent values obtained during routine analysis.

Anonymous Lab Number Average
δ13C vs VPDB
(‰)
Standard Deviation
δ13C
(‰)
Sample Size
δ13C
Average
δ15N vs AirN2
(‰)
Standard Deviation
δ15N
(‰)
Sample Size
δ15N
Survey -25.99 0.18   1.98 0.21  
1 -26.03 0.21 50 2.00 0.10 10
2 -25.90 0.02 3 1.80 0.06 3
3 -25.89 0.13   1.89 0.15  
4 -26.00 0.19 5 1.80 0.16 5
5       2.00 0.09 7
6 -25.90 0.05 12 2.40 0.22 12
7 -26.19 0.01 3 1.92 0.07 3
8 -25.88 0.06   2.25 0.23  
9 -25.79 0.14   1.72 0.08  
10 -25.93 0.07 475 1.92 0.14 407
11 -25.80     1.90    
12 -26.03 0.16 10 1.98 0.27 10
13 -26.50     1.80    
14       2.20 0.08 5
15 -25.90 0.05 12 1.90 0.23 12
16 -26.30   2 2.10 0.04 3
17 -25.90 0.03 5 1.90 0.02 5
18 -26.00 0.26 4 2.50 0.12 4
19       1.80 0.20 10
20 -25.97 0.12   1.87 0.13  

Reference Material Footnotes

1 - exact values defining the VPDB delta scale
2 - exact value defining the VCDT delta scale
3 - exact values defining the VSMOW delta scale
4 - NOT accepted, Lithium carbonate acid fractionation not well known, this value assumes calcium carbonate acid fractionation
5 - Schauer et al. Rapid Commun. Mass Spectrom. 2012, 26, 2151-2157. DOI: 10.1002/rcm.6332
6 - interim consensus values used for AirN2 scale normalization
7 - Schoenemann et al. Rapid Commun. Mass Spectrom. 2013. DOI: 10.1002/rcm.6486
8 - C2 is Merck Suprapur Calcium carbonate product number 1020590050 (50 g bottle)