Accuracy and precision of 88Sr/86Sr and 87Sr/86Sr measurements by MC‐ICPMS compromised by high barium concentrations

Scher, Howie D.; Griffith, Elizabeth M.; Buckley, Wayne

doi:10.1002/2013gc005134

Cited by 28 publications

(15 citation statements)

References 31 publications

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“…These observations are of significance not only in isotope ratio analyses reported previously and in our further work, but also provide a route for generating these ions for further fundamental investigations.…”

Section: Figuresupporting

confidence: 76%

Mass Spectrometric Observation of Doubly Charged Alkaline‐Earth Argon Ions

et al. 2016

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Doubly charged diatomic ions MAr(2+) where M=Mg, Ca, Sr or Ba have been observed by mass spectrometry with an inductively coupled plasma ion source. Abundance ratios are quite high, 0.1 % for MgAr(2+) , 0.4 % for CaAr(2+) , 0.2 % for SrAr(2+) and 0.1 % for BaAr(2+) relative to the corresponding doubly charged atomic ions M(2+) . It is assumed that these molecular ions are formed through reactions of the doubly charged metal ions with neutral argon atoms within the ion source. Bond dissociation energies (D0 ) were calculated and agree well with previously published values. The abundance ratios MAr(+) /M(+) and MAr(2+) /M(2+) generally follow the predicted bond dissociation energies with the exception of MgAr(2+) . Mg(2+) should form the strongest bond with Ar [D0 (MgAr(2+) )=124 to 130 kJ mol(-1) ] but its relative abundance is similar to that of the weakest bound BaAr(2+) (D0 =34 to 42 kJ mol(-1) ). The relative abundances of the various MAr(2+) ions are higher than those expected from an argon plasma at T=6000 K, indicating that collisions during ion extraction reduce the abundance of the MAr(2+) ions relative to the composition in the source. The corresponding singly charged MAr(+) ions are also observed but occur at about three orders of magnitude lower intensity than MAr(2+) .

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Section: Figuresupporting

confidence: 76%

Mass Spectrometric Observation of Doubly Charged Alkaline‐Earth Argon Ions

et al. 2016

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“…In Figure 2, in which strontium concentrations and the related 87 Sr/ 86 Sr isotope ratios of all sampled waters are plotted, it is easy to show how groundwater of meteoric origin from Djibouti and Ethiopia fall in a common wide strip. The upper limit curve of this strip has the following endmembers: i) rainwater, with an Sr concentration of 0.005 mg/L and a seawater-like 87 Sr/ 86 Sr ratio of 0.709175 [43,44], typical of an average rain from coastal areas in a monsoon zone [45]; and ii) basalt with an 87 Sr/ 86 Sr Asal plume signature of 0.7035 and the lowest detected Sr concentration of 100 ppm, typical of less-evolved basalts [46]. The endmembers can be joined by a binary mixing equation, which would be represented by a straight line if the axes of the diagram plotted as Y = 1/Sr versus X = 87 Sr/ 86 Sr.…”

Section: Resultsmentioning

confidence: 99%

Waters from the Djiboutian Afar: A Review of Strontium Isotopic Composition and a Comparison with Ethiopian Waters and Red Sea Brines

Boschetti

Awaleh

Barbieri

2018

Water

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Drinking water is scarce in Djibouti because of the hot desert climate. Moreover, seawater intrusion or fossil saltwater contamination of the limited number of freshwater aquifers due to groundwater overexploitation affect those who live close to the coastline (~80% of the population). Despite this, the geothermal potential of the country’s plentiful hot springs could resolve the increasing electricity demand. Strontium isotopes (87Sr/86Sr) are routinely used to determine sources and mixing relationships in geochemical studies. They have proven to be useful in determining weathering processes and quantifying endmember mixing processes. In this study, we summarise and reinterpret the 87Sr/86Sr ratio and Sr concentration data of the groundwater collected to date in the different regions of the Djibouti country, trying to discriminate between the different water sources, to evaluate the water/rock ratio and to compare the data with those coming from the groundwater in the neighbouring Main Ethiopian Rift and the Red Sea bottom brine. New preliminary data from the groundwater of the Hanlé-Gaggadé plains are also presented.

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“…Most of the potential matrix and isobaric interference elements such as Ca, Rb, and Zr were eliminated by the first 6 ml 2 M HNO 3 and Ba was removed by the following 9 ml 7 M HNO 3 . The presence of Ba in the sample solution may cause significant isotope fractionation of Sr during mass spectrometry, thus, Ba removal is critical in Sr purification (de Souza et al, 2010;Chao et al, 2013;Scher et al, 2014). The Sr fraction was collected by 6 ml Milli-Q water, evaporated to dryness, and redissolved in 1 ml 0.3 M HNO 3 in sequence.…”

Section: Extraction Chromatographymentioning

confidence: 99%