Measurement parameter selection for quantitative isotope dilution gas chromatography/mass spectrometry

Colby, B. N.; Rosecrance, Ann E.; Colby, M. Elana.

doi:10.1021/ac00235a042

Cited by 49 publications

(18 citation statements)

References 9 publications

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“…Quantification by isotope-dilution GC-MS is based on the response ratio between selected masses for the native compound and the added internal standard. As has been discussed by Colby et al (1981), the amount of internal standard relative to the native compound influences the reliability in quantification by isotope dilution. This is due to severa1 factors, but of particular importance is the degree of isotopic substitution in the internal standard and the difference in masses between the native compound and the internal standard.…”

Section: Results a N D Discussionmentioning

confidence: 99%

A Microscale Technique for Gas Chromatography-Mass Spectrometry Measurements of Picogram Amounts of Indole-3-Acetic Acid in Plant Tissues

et al. 1995

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A microscale technique has been developed for routine quantifications of picogram amounts of indole-3-acetic acid (IAA) in plant tissues by combined gas chromatography-mass spectrometry. Lowand high-resolution selected-ion-monitoring and selected-reactionmonitoring mass spectrometry techniques were compared for selectivity and precision. The best selectivity was obtained with selected-reaction-monitoring analysis, and 1 -mg samples containing 500 fg of IAA could be analyzed accurately with this method. This technique was used to investigate the IAA distribution pattern along the longitudinal axis of tobacco (Nicofiana tabacum [L.]) leaves. In young, developing leaves an increase of endogenous IAA from the leaf tip to the base of the leaf was observed, whereas the leve1 of IAA was uniform along this axis in mature leaves.

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Section: Results a N D Discussionmentioning

confidence: 99%

A Microscale Technique for Gas Chromatography-Mass Spectrometry Measurements of Picogram Amounts of Indole-3-Acetic Acid in Plant Tissues

et al. 1995

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“…Over a wide range of spike-sample ratios ( 110 Cd/ 111 Cd E 5-30), the error magnification factor 27,28 of the Cd ID data reduction is less than 2. This means that an uncertainty of about AE1% on the 110 Cd/ 111 Cd ratio translates into an error of about AE1-2% for the Cd concentration.…”

Section: Accuracy Of Isotopic Data-analyses Of Unspiked Foraminiferal...mentioning

confidence: 97%

A highly sensitive MC-ICPMS method for Cd/Ca analyses of foraminiferal tests

Ripperger

Rehkämper

2007

J. Anal. At. Spectrom.

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“…The relation between precision of an abundance determination (|dC/C|) with that of an isotope ratio measurement (|dR/R|) is described by the following equation (Colby et al, 1981).…”

Section: The Precision Of Isotope Dilution Analysismentioning

confidence: 99%

238U/230Th disequilibrium measurement for volcanic standard rock samples using a multiple-collector ICPMS.

Fukuda

Nakai

2002

Geochem. J.

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The radioactive disequilibrium measurements between 238 U and 230 Th with a Multi-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICPMS) were applied to igneous standard rocks distributed by Geological Survey of Japan and Geological Survey of the United States. We modified sample dissolution and Th separation method, as well as Th isotope analysis by MC-ICPMS described by Nakai et al. (2001). High sensitivity of our ICP-MS enabled to analyze less than 10 ng Th. The abundances of U and Th were determined by an isotope dilution method, using a 235 U depleted uranium reagent and 230 Th prepared by milking of natural U as spikes.We can determine 238 U/ 232 Th abundance ratio with a precision of about 2%. This procedure was applied to ( 238 U/ 230 Th) radioactive disequilibrium measurements of igneous standard rock samples. Samples older than 350 Ka were found to attain secular equilibrium, indicating the accuracy of our analysis. On the other hand, young igneous standard rocks were found enriched in 238 U relative to 230 Th, ( 238 U/ 230 Th) activity ratio > 1, which is often observed for igneous rocks from subduction zones.

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Measurement parameter selection for quantitative isotope dilution gas chromatography/mass spectrometry

Cited by 49 publications

References 9 publications

A Microscale Technique for Gas Chromatography-Mass Spectrometry Measurements of Picogram Amounts of Indole-3-Acetic Acid in Plant Tissues

A Microscale Technique for Gas Chromatography-Mass Spectrometry Measurements of Picogram Amounts of Indole-3-Acetic Acid in Plant Tissues

A highly sensitive MC-ICPMS method for Cd/Ca analyses of foraminiferal tests

238U/230Th disequilibrium measurement for volcanic standard rock samples using a multiple-collector ICPMS.

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