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Technical Guide: IRMS Reference Materials

We are often asked by customers about our reference materials for IRMS. To help explain these points we have prepared a technical guide on these materials.

All IRMS data should be traceable to Primary reference standards. These primary references are materials that have been selected and assigned definitive delta (δ) values for the light elements H, C, O, N and S and are isotope ratio scale defining.

 

Element

IAEA reference (example)

Material

Delta value (‰) wrt zero points

Scale zero point

Nitrogen

IAEA-N-1

Ammonium sulphate

0.4

Air

Hydrogen

IAEA-CH-7

Polyethylene

-100.3

V-SMOW

Oxygen

NBS-18

Calcite

-23.3

V-SMOW

Carbon

IAEA-CH-3

Cellulose

-24.72

V-PDB

 

Sulphur

IAEA-SO-5

Barium sulphate

0.5

V-CDT
 
 

IRMS reference materials available from Elemental Microanalysis:

Values are approximate: refer to certificate of analysis for current values.

Inter-laboratory comparison Certified Isotopic reference materials

Part No

Material

Pack

δ 13C ‰

δ 2H ‰

δ 15N ‰

δ 18O ‰

δ 34S ‰

% C

% H

% N

% O

% S

B2203

IRMS EMA P1

3g

-28

-25

 

21

-3

61.5

3.5

 

20.9

13.9

B2205

IRMS EMA P2

3g

-28

-88

-2

27

 

68.4

2.9

7.5

19.9

 

B2207

Silver Phosphate

1g

   

 

22

   

 

 

 

 

B2214

Carrara marble

0.5g

2

   

-2

         

 

 

 

 Certified Isotopic reference materials

Part No
Material
Pack
δ 13C ‰
δ 2H ‰
δ 15N ‰
δ 18O ‰
δ 34S ‰
% C
% H
% N
% O
% S
B2153
Low Organic Soil
5g
-27
 
7
 
 
1.6
 
0.1
 
0.0
B2155
Protein (Casein)
5g
-27
 
6
 
6*
46.5
 
13.3
 
0.8
B2157
Wheat Flour
5g
-27
 
3
 
1*
39.4
 
1.4
 
0.1
B2159
Sorghum Flour
5g
-14
 
2
 
10*
41.3
 
1.5
 
0.1
B2215
Gelatin
2g
-23
 
4
7
1
 
7
 
 
 

  *Not certified value - for reference only*

 Uncertified working standards

Part No
Material
Pack
δ 13C ‰
δ 2H ‰
δ 15N ‰
δ 18O ‰
δ 34S ‰
% C
% H
% N
% O
% S
B2190
High enriched water
25ml
 
1702
 
267
 
 
 
 
 
 
B2191
Medium enriched water
25ml
 
843
 
109
 
 
 
 
 
 
B2192
Zero natural water                                 
25ml
 
11
 
0
 
 
 
 
 
 
B2193
Medium natural water             
25ml
 
-98
 
-12
 
 
 
 
 
 
B2194
Low natural water
25ml
 
-269
 
-34
 
 
 
 
 
 
B2195
Set of 5 water working standards (B2190 to B2194)
 
 
 
 
 
 
 
 
 
 
 
B2172
Olive Oil
5g
-29
 
 
 
 
 
 
 
 
 
B2174
Urea
5g
-43
 
-1
 
 
 
 
 
 
 
B2213
Spruce (Wood) powder
3g
-25
 
-3
24
 
50.0
6.3
0.1
40.0
 

 

 

Additional Information available: IRMS Refs Tech Bulletin - June 2017.pdf
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