Stable isotope ratio analysis is the precise measurement of the abundance ratio of two stable isotopes of a particular element. Many elements have two or more naturally occurring stable isotopes. Since the isotopes of a particular element have identical chemical properties but slightly different masses, they may enter into chemical reactions at different rates which can induce local variations in isotopic composition. The measurement of these variations can reveal information about the origin and/or the processes that have affected the material analyzed.

In the stable isotope laboratory at Geochron, we prepare and analyze a variety of materials for their nitrogen, sulfur, carbon, oxygen, and hydrogen stable isotope compositions.

Services

Cost per Sample

Recommended Sample Size

Nitrogen d15N Analyses

N2gas

$25.00

> 1 ccSTP N2

N in organic compounds

$55.00

>1 mg contained N

 

Sulfur d34S Analyses

SO2 gas

$25.00

> 1 ccSTP SO2

Native Sulfur/Sulfides

$60.00

> 5 mg mineral

Sulfates/Dissolved sulfate

$80.00

> 10 mg mineral

S in organic compounds

$125.00

> 1 mg contained S

 

Carbon d13C Analyses

CO2 gas

$25.00

> 0.1 ccSTP CO2

CO2 in mixed gas

$35.00

> 0.1 ccSTP CO2

Carbonates/Dissolved carbonate

$45.00

> 0.5 mg mineral

C in organic compounds

$55.00

> 50 mg contained C

 

Carbon d13C & Oxygen d18O Analyses

Carbonates

$70.00

> 0.5 mg mineral

 

Oxygen d18O Analyses

CO2 gas

$25.00

> 0.1 ccSTP CO2

Water

$45.00

> 10 ml H2O

Carbonates

$45.00

> 0.5 mg mineral

Silicates/Whole rocks

Please inquire

> 10 mg mineral

 

Hydrogen dD Analyses

H2 gas

$30.00

> 5 ccSTP H2

Water

$75.00

> 1 ml H2O

Hydrous silicates/Whole rocks

Please inquire

> 0.5 g mineral

Recommended sample sizes allow for replicate preparations and analyses. Smaller sizes can be accommodated. Contact us to discuss your requirements.

All prices listed are for analyses of clean, separated, and sized samples of near-natural isotopic compositions. Samples requiring physical sizing, separation from other phases, or chemical pretreatment, will incur nominal preparation charges. Samples with significant isotopic depletion or enrichment with respect to natural levels should be discussed with us in advance, and may be subject to additional analytical charges.

Analyses of more than one isotope on the same material may be available at reduced rates if the sample gases can be derived from a combined preparation procedure. Other types of specialized isotopic analyses not listed here may be made available by prior arrangement.

For most stable isotope services, the turn-around time is normally less than six weeks. Oxygen on silicates and hydrogen on hydrous silicates may take up to twelve weeks.

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