Interlaboratory comparison of different analytical techniques for the determination of oxygen-18 abundance

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Analytical Chemistry (Washington); (USA)

DOI:https://doi.org/10.1021/ac00206a011· OSTI ID:6410774

Speakman, J R; Poppitt, S D; Racey, P A ^[1]; Nagy, K A; Strathearn, G E ^[2]; Masman, D; Mook, W G ^[3]

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1. Univ. of Aberdeen (Scotland)
2. Univ. of California, Los Angeles (USA)
3. Rijksuniversiteit Groningen (Netherlands)

A series of six artificially enriched waters, containing between 2,500 and 6,500 ppm oxygen-18, was prepared by adding weighed portions of distilled water and highly enriched H{sub 2}{sup 18}O. These waters were analyzed by radio activation analysis (proton activation PAA) and by gas isotope ratio mass spectrometry (gIRMS) with CO{sub 2} as the analysis gas. Carbon dioxide was prepared from water samples either by using the guanidine reaction, with 3-, 5- and 10-{mu}L samples, or by isotopic equilibration, using small (10 {mu}L) and large (1.5 mL) samples. The large samples were diluted to the natural abundance range prior to analysis as were the 3-{mu}L guanidine samples. Precision was greatest with large sample CO{sub 2} equilibration (mean relative standard deviation (RSD) = 0.108%). The other gIRMS gas preparation techniques had lower precision (3 {mu}L guanidine, RSD = 0.529%, 5 {mu}L guanidine, RSD = 0.364%, 10 {mu}L guanidine, RSD = 0.48%; 10 {mu}L equilibration, RSD = 0.43%) and the lowest precision occurred with PAA (RSD = 0.58%). For all the techniques except small sample equilibration, accuracy (percent deviation of mean evaluation from expected gravimetric mean) was worse than precision (RSD).

• OSTI ID: 6410774
• Journal Information: Analytical Chemistry (Washington); (USA), Journal Name: Analytical Chemistry (Washington); (USA) Vol. 62:7; ISSN 0003-2700; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
CALCULATION METHODS
CHEMICAL ANALYSIS
EVEN-EVEN NUCLEI
INTERLABORATORY COMPARISONS
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MASS SPECTROSCOPY
NUCLEI
OXYGEN 18
OXYGEN ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
RADIOACTIVATION
SPECTROSCOPY
STABLE ISOTOPES