A rapid and high‐precision method for sulfur isotope δ<sup>34</sup>S determination with a multiple‐collector inductively coupled plasma mass spectrometer: matrix effect correction and applications for water samples without chemical purification

Lin, An-Jun; Yang, Tao; Jiang, Shao‐Yong

doi:10.1002/rcm.6838

Cited by 19 publications

(35 citation statements)

References 27 publications

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“…At the least, the pore water obtained in this way can be analyzed for sulfate concentrations. With a combination of elaborate sulfur extraction techniques (Arnold et al, 2014) and high sensitivity isotope analysis by multi-collector ICPMS (Paris et al, 2013;Lin et al, 2014) it might even be possible to measure the sulfur isotope composition of sulfate. However, in light that barite dissolution in sulfate-free seawater would yield a sulfate concentration <20 µM researchers must brace themselves for extremely low sulfate concentrations for sulfur and oxygen isotope analyses.…”

Section: Discussionmentioning

confidence: 99%

Off Limits: Sulfate below the Sulfate-Methane Transition

et al. 2016

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One of the most intriguing recent discoveries in biogeochemistry is the ubiquity of cryptic sulfur cycling. From subglacial lakes to marine oxygen minimum zones, and in marine sediments, cryptic sulfur cycling-the simultaneous consumption and production of sulfate-has been observed. Though this process does not leave an imprint in the sulfur budget of the ambient environment-thus the term cryptic-it may have a massive impact on other element cycles and fundamentally change our understanding of biogeochemical processes in the subsurface. Classically, the sulfate-methane transition (SMT) in marine sediments is considered to be the boundary that delimits sulfate reduction from methanogenesis as the predominant terminal pathway of organic matter mineralization. Two sediment cores from Aarhus Bay, Denmark reveal the constant presence of sulfate (generally 0.1-0.2 mM) below the SMT. The sulfur and oxygen isotope signature of this deep sulfate ( 34 δ S = 18.9‰, 18 δ O = 7.7‰) was close to the isotope signature of bottom-seawater collected from the sampling site ( 34 δ S = 19.8‰, 18δ O = 7.3‰). In one of the cores, oxygen isotope values of sulfate at the transition from the base of the SMT to the deep sulfate pool ( 18 δ O = 4.5-6.8‰) were distinctly lighter than the deep sulfate pool. Our findings are consistent with a scenario where sulfate enriched in 34 S and 18 O is removed at the base of the SMT and replaced with isotopically light sulfate below. Here, we explore scenarios that explain this observation, ranging from sampling artifacts, such as contamination with seawater or auto-oxidation of sulfide-to the potential of sulfate generation in a section of the sediment column where sulfate is expected to be absent which enables reductive sulfur cycling, creating the conditions under which sulfate respiration can persist in the methanic zone.

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Section: Discussionmentioning

confidence: 99%

Off Limits: Sulfate below the Sulfate-Methane Transition

et al. 2016

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“…Lin et al 151 overcame these issues using a medium mass resolution (m/Dm $ 3000) and matrix matched standards. Lin et al 151 overcame these issues using a medium mass resolution (m/Dm $ 3000) and matrix matched standards.…”

Section: Stable Isotope Systematicsmentioning

confidence: 99%

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2015

J. Anal. At. Spectrom.

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“…While the use of ion selective resin is useful to pre-concentrate sulfate in fresh-water samples [22-24], the resin based method remains unfavorable in marine and marine-type media due to the high and close affinity of the resin for chloride and sulfate. Recently, the use of multiple collector – inductively coupled plasma mass spectrometry (MC-ICPMS) has been developed for the analysis of extremely small quantities of sulfate [25,26]. Although sulfur isotope analysis by MC-ICPMS lowers the detection limit for sulfur isotope analysis by several orders of magnitude (down to ~5 nmol S), the sample preparation prior to the MC-ICPMS analysis still requires resin based chemistry and there are less than a handful of facilities that specialize in this instrumentation and methodology [25,27].…”

Section: Resultsmentioning

confidence: 99%

Modern applications for a total sulfur reduction distillation method - what’s old is new again

et al. 2014

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BackgroundThe use of a boiling mixture of hydriodic acid, hypophosphorous acid, and hydrochloric acid to reduce any variety of sulfur compounds has been in use in various applications since the first appearance of this method in the literature in the 1920’s. In the realm of sulfur geochemistry, this method remains a useful, but under-utilized technique. Presented here is a detailed description of the distillation set-up and procedure, as well as an overview of potential applications of this method for marine sulfur biogeochemistry/isotope studies. The presented applications include the sulfur isotope analysis of extremely low amounts of sulfate from saline water, the conversion of radiolabeled sulfate into sulfide, the extraction of refractory sulfur from marine sediments, and the use of this method to assess sulfur cycling in Aarhus Bay sediments.ResultsThe STrongly Reducing hydrIodic/hypoPhosphorous/hydrochloric acid (STRIP) reagent is capable of rapidly reducing a wide range of sulfur compounds, including the most oxidized form, sulfate, to hydrogen sulfide. Conversion of as little as approximately 5 micromole sulfate is possible, with a sulfur isotope composition reproducibility of 0.3 permil.ConclusionsAlthough developed many decades ago, this distillation method remains relevant for many modern applications. The STRIP distillation quickly and quantitatively converts sulfur compounds to hydrogen sulfide which can be readily collected in a silver nitrate trap for further use. An application of this method to a study of sulfur cycling in Aarhus Bay demonstrates that we account for all of the sulfur compounds in pore-water, effectively closing the mass balance of sulfur cycling.

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A rapid and high‐precision method for sulfur isotope δ³⁴S determination with a multiple‐collector inductively coupled plasma mass spectrometer: matrix effect correction and applications for water samples without chemical purification

Cited by 19 publications

References 27 publications

Off Limits: Sulfate below the Sulfate-Methane Transition

Off Limits: Sulfate below the Sulfate-Methane Transition

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Modern applications for a total sulfur reduction distillation method - what’s old is new again

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A rapid and high‐precision method for sulfur isotope δ34S determination with a multiple‐collector inductively coupled plasma mass spectrometer: matrix effect correction and applications for water samples without chemical purification

Cited by 19 publications

References 27 publications

Off Limits: Sulfate below the Sulfate-Methane Transition

Off Limits: Sulfate below the Sulfate-Methane Transition

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Modern applications for a total sulfur reduction distillation method - what’s old is new again

Contact Info

Product

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A rapid and high‐precision method for sulfur isotope δ³⁴S determination with a multiple‐collector inductively coupled plasma mass spectrometer: matrix effect correction and applications for water samples without chemical purification