Reference Materials

 

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 carbonate device

Reference
Material
δ13C
VPDB (permil)
δ18O
VSMOW (permil)
Material
NBS191limestone+1.95+28.65limestone
LSVEC1lithium carbonate-46.6+3.694lithium carbonate
NBS18carbonatite-5.01+7.20carbonatite
C1marble+2.55+30.41marble
C2calcium carbonate-48.94+14.04calcium carbonate
CQS2calcium carbonate-2.13+15.16calcium carbonate

Reference Materials for Sulfate Δ17O

Silver sulfate pyrolysis, in-house designer standards

Reference
Material
Δ17O
VSMOW (permil)
Material
sulfα50.9sodium sulfate
sulfβ52.0sodium sulfate
sulfε57.0sodium sulfate

Reference Materials for Nitrate δ15N δ18O Δ17O

Bacterial denitrifier method

Reference
Material
δ15N
Air N2 (‰)
Δ17O
VSMOW (‰)
δ18O
VSMOW (‰)
Material
IAEA-NO-3 potassium nitrate+4.72-0.2+25.32potassium nitrate
USGS326 potassium nitrate+180+25.4potassium nitrate
USGS34 potassium nitrate-1.8-0.1-27.78potassium nitrate
USGS35 sodium nitrate+2.5+21.6+56.81sodium nitrate
USGS34 / 35mix USGS34 / USGS35 50:50 mixture+0.45+10.75USGS34 / USGS35 50:50 mixture

Reference Materials for Solid δ13C δ15N δ34S

Reference MaterialRef. Materialδ13C
VPDB (‰)
δ15N
Air N2 (‰)
δ34S
VCDT (‰)
Material
IAEA-N-16 +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 15474 peach leaves-25.99+1.98 peach leaves
GA1 glutamic acid-28.2-4.6 glutamic acid
GA2 glutamic acid-13.6-5.6 glutamic acid
Salmon Bristol Bay Sockeye-21.311.3 Bristol Bay Sockeye
MAL Malachite Lake Sediment-26.5-0.4+8.3Malachite Lake Sediment
IAEA-S-12 silver sulfide  -0.3silver sulfide
IAEA-S-3 silver sulfide  -32.55silver sulfide
NBS-127 barium sulfate  +21.1barium sulfate
Ag2S silver sulfide  +17.60silver sulfide
ZnS zinc sulfide  -32.31zinc sulfide
BaSO4 barium sulfate  +4.59barium sulfate

Reference Materials for Water δD δ18O 17Oexcess

Reference
Material
Ref.
Material
δD
VSMOW (‰)
17Oexcess17O excess
VSMOW (permeg)VSMOW (per meg)
δ18O
VSMOW (‰)
Material
VSMOW3VSMOW3
Vienna Standard Mean Ocean Water
000Vienna Standard Mean Ocean Water
VSMOW2VSMOW2
Vienna Standard Mean Ocean Water
000Vienna Standard Mean Ocean Water
GISPGISP
Greenland Ice Sheet P. Water
-19022-24.8Greenland Ice Sheet Precipitation Water
GISP2GISP2
Greenland Ice Sheet P. Water
-258.3-33.43 Greenland Ice Sheet Precipitation Water
SLAP3,7 Standard Light Antarctic P. Water-4280-55.5Standard Light Antarctic Precipitation Water
SLAP23,7 Standard Light Antarctic P. Water-427.50-55.50Standard Light Antarctic Precipitation Water
USGS PR USGS Puerto Rico Water-1.3 -1.52USGS Puerto Rico Water
USGS A1 USGS Antarctic Water-395 -50.02USGS Antarctic Water
RW Ev. enriched Seattle Water-18.52 +5.15Evaporatively enriched Seattle Water
PW Penn. Water-42.1230-6.88Pennsylvania Water
SW Seattle Water-75.6333-10.55Seattle Water
BW ITASE / Seattle Water-156.87 -20.01ITASE / Seattle Water
AW Antarctic Water-231.54 -29.79Antarctic Water
WW WAIS Water-268.3027-33.82WAIS Water
CW WDC06A Water NICL 2009-265.95 -33.64WDC06A Water NICL 2009
TDW Taylor Dome Water-309.49 -38.76Taylor Dome Water
WGW WDC06A Water Last Glacial Period-318.8217-39.77WDC06A Water Last Glacial Period
SVW Seattle / Vostok Water-316.59 -41.13Seattle / Vostok Water
VW Vostok Water-438.79 -56.61Vostok Water
O2 gas Oxygen in comp. gas cylinder 48.4-8.26Oxygen in compressed gas cylinder

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 submit your information to Andy. 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 NumberAverage
δ13C vs VPDB
(‰)
Standard Deviation
δ13C
(‰)
Sample Size
δ13C
Average
δ15N vs AirN2
(‰)
Standard Deviation
δ15N
(‰)
Sample Size
δ15N
Survey-25.990.18 1.980.21 
1-26.030.21502.000.1010
2-25.900.0231.800.063
3-25.890.13 1.890.15 
4-26.000.1951.800.165
5   2.000.097
6-25.900.05122.400.2212
7-26.190.0131.920.073
8-25.880.06 2.250.23 
9-25.790.14 1.720.08 
10-25.930.074751.920.14407
11-25.80  1.90  
12-26.030.16101.980.2710
13-26.50  1.80  
14   2.200.085
15-25.900.05121.900.2312
16-26.30 22.100.043
17-25.900.0351.900.025
18-26.000.2642.500.124
19   1.800.2010
20-25.970.12 1.870.13 
Anon. Lab #Avg.
δ13C vs VPDB
(‰)
Std. Dev.
δ13C
(‰)
Sample Size
δ13C
Survey-25.990.18 
1-26.030.2150
2-25.900.023
3-25.890.13 
4-26.000.195
5   
6-25.900.0512
7-26.190.013
8-25.880.06 
9-25.790.14 
10-25.930.07475
11-25.80  
12-26.030.1610
13-26.50  
14   
15-25.900.0512
16-26.30 2
17-25.900.035
18-26.000.264
19   
20-25.970.12 
Anon. Lab #Avg.
δ15N vs AirN2
(‰)
Std. Dev.
δ15N
(‰)
Sample Size
δ15N
Survey1.980.21 
12.000.1010
21.800.063
31.890.15 
41.800.165
52.000.097
62.400.2212
71.920.073
82.250.23 
91.720.08 
101.920.14407
111.90  
121.980.2710
131.80  
142.200.085
151.900.2312
162.100.043
171.900.025
182.500.124
191.800.2010
201.870.13 

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 Numberδ17O (‰) 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 ± 0.0524.24 4.2423.70 23.7023.70 23.70
2-4.45 ± 0.022 -4.45 ± 0.022-8.60 ± 0.017 -8.60 ± 0.017100.51 100.51unk unkunk unk
3-4.32 ± 0.009 -4.32 ± 0.009-8.26 ± 0.015 -8.26 ± 0.01548.38 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 ± 0.09266.06 66.0612.53 12.5324.56 24.56
5-4.17 ± 0.044 -4.17 ± 0.044-7.89 ± 0.025 -7.89 ± 0.0257.20 7.208.84 8.8417.56 17.56

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

VPDB = 0.97001 × VSMOW - 29.99


from Coplen blue book

Δ 17O is calculated as δ17O - 0.52 × δ18O


in units of permil

17O excess is calculated as (ln (δ 17O/1000 + 1) - 0.528 × ln(δ 18O/1000 + 1) ) × 1,000,000

in units of permeg

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