Oxygen Isotope Corrections in Continuous-Flow Measurements of SO2

Leckrone, Kristen J.; Ricci, Margaret P.

doi:10.1016/b978-044451114-0/50047-8

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The accuracy of δ 34 S determinations can be reduced for samples with low sulfur contents (less than approximately 1 wt%) due to complications in the combustion reaction and poor chromatography (for example, Kester and others, 2001;Fry and others, 2002;Leckrone and Ricci, 2007). When lowsulfur samples are being analyzed, accuracy is best evaluated by comparing representative results to results obtained in separate experiments in which the sulfur is extracted by acid digestion (Appendix 4), Eschka fusion (Tuttle and others, 1986), or some other technique and then analyzed isotopically as either silver sulfide (Ag 2 S) or BaSO 4 .…”

mentioning

confidence: 99%

Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer

Stricker¹,

Gulbransen²,

Emmons³

2018

Techniques and Methods

View full text Add to dashboard Cite

mentioning

confidence: 99%

Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer

Stricker¹,

Gulbransen²,

Emmons³

2018

Techniques and Methods

View full text Add to dashboard Cite

δ³⁴S measurements on organic materials by continuous flow isotope ratio mass spectrometry

Yun

Mayer

Taylor

2005

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Sulfur (S) isotope ratios of thoroughly dried organic samples were measured by direct thermal decomposition in an elemental analyzer coupled to an isotope ratio mass spectrometer in continuous flow mode (EA-CF-IRMS). For organic samples of up to 13 mg weight and with total S contents of more than 10 microg, the reproducibility of the delta34S(organic) values was +/-0.4 per thousand or better. However, the delta34S values of organic samples measured directly by online EA-CF-IRMS analysis were between 0.3 and 2.9 per thousand higher than those determined on BaSO4 precipitates produced by Parr Bomb oxidation from the same sample material. Our results suggest that structural oxygen in organic samples influences the oxygen isotope ratios of the SO2 produced from organic samples. Consequently, SO2 generated from organic samples appears to have different 18O/16O ratios than SO2 generated from BaSO4 precipitates and inorganic reference materials, resulting in a deviation from the true delta34S values because of 32S16O18O contributions to mass 66. It was shown that both the amount of structural oxygen in the organic sample, and the difference of the oxygen isotope ratios between organic samples and tank O2, influenced the magnitude of the observed deviation from the true delta34S value after direct EA-CF-IRMS analysis of organic samples. Suggestions are made to correct the difference between measured delta34S(organic) and true delta34S values in order to obtain not only reproducible, but also accurate S isotope ratios for organic materials by EA-CF-IRMS.

show abstract

Coupled N, C and S stable isotope measurements using a dual‐column gas chromatography system

Fry

2007

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Many laboratories routinely analyze plant, animal and soil samples with elemental analyzers coupled to isotope ratio mass spectrometers, obtaining rapid results for nitrogen (%N, d 15 N) and carbon (%C, d 13 C) from the same sample. The coupled N and C measurements are possible because of a gas chromatography (GC) separation of N 2 and CO 2 gases produced in elemental analysis. Adding a second GC column allows additional measurement of sulfur (%S, d 34 S) from the same sample, so that combined N, C and S information is obtained routinely. Samples are 1-15 mg, and replicates generally differ by less than 0.1% for d S. An example application shows that the N, C, and S measurement system allows a three-dimensional view of element dynamics in estuarine systems that are undergoing pollution inputs from upstream watersheds. Extension of these GC principles should allow coupled H, C, N, and S isotope measurements in future work. Copyright # 2007 John Wiley & Sons, Ltd.Measuring several parameters together from the same sample is desirable for many reasons, partly to save time, cost and sample, but also because the resulting coupled data allow a multivariate view of scientific problems. This paper describes a new advance in the field of coupled elemental and isotope analysis, adding S analyses to existing systems that already measure N and C amounts and isotopes in routine laboratory settings. Sulfur isotopes are valuable tracers in biogeochemical studies of element cycling on ecological and geological time scales, 1,2 complementing and expanding tracer information gained from N and C isotope measurements. 3 This paper focuses mostly on the added S analyses, and gives practical guidelines on how to make routine these new N, C and S (hereafter NCS) measurements. Laboratory analyses of sulfur are traditionally difficult and performed separately from nitrogen and carbon analyses. [4][5][6][7] Problems encountered with sulfur derive mostly from production of SO 2 gas in elemental analyzers, with SO 2 often reacting with surfaces and behaving in a 'sticky' fashion as it slowly desorbs and moves through combustion systems. Current NC analysis uses a combined elemental analyzer-isotope ratio mass spectrometer (EA-IRMS) system with one gas chromatography (GC) column to separate N 2 and CO 2 gases for sequential analysis. The new main feature of the system described here is use of a second GC column to separate SO 2 from N 2 and CO 2 gases. The N 2 and CO 2 gases pass through both GC columns for N then C measurements, while the SO 2 is only slowly moving through the first column. Upon completion of the N and C measurements, the second GC column is switched out of the gas-handling system, allowing flow rates to increase by twofold, rapidly eluting the SO 2 to the mass spectrometer for S measurements. The system described here complements a recent report of an analyzer capable of coupled H, C, N, and S (hereafter HCNS) measurements, 8 with the main difference that the system described here separates gases with GC and avoids usin...

show abstract

Oxygen Isotope Corrections in Continuous-Flow Measurements of SO2

Cited by 3 publications

References 0 publications

Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer

Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer

δ³⁴S measurements on organic materials by continuous flow isotope ratio mass spectrometry

Coupled N, C and S stable isotope measurements using a dual‐column gas chromatography system

Contact Info

Product

Resources

About

Oxygen Isotope Corrections in Continuous-Flow Measurements of SO2

Cited by 3 publications

References 0 publications

Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer

Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer

δ34S measurements on organic materials by continuous flow isotope ratio mass spectrometry

Coupled N, C and S stable isotope measurements using a dual‐column gas chromatography system

Contact Info

Product

Resources

About

δ³⁴S measurements on organic materials by continuous flow isotope ratio mass spectrometry