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  • Schmidt, Torsten C.  (2)
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  • 1
    Online Resource
    Online Resource
    Strontium carbonate precipitation as a sample preparation technique for isotope ratio analysis of Sr in mineral water and wine by quadrupole‐based inductively coupled plasma mass spectrometry
    Wiley ; 2018
    In:  Rapid Communications in Mass Spectrometry Vol. 32, No. 2 ( 2018-01-30), p. 149-158
    Details
    In: Rapid Communications in Mass Spectrometry, Wiley, Vol. 32, No. 2 ( 2018-01-30), p. 149-158
    Abstract: The defined origin of food products is nowadays often seen as a marker of quality. Stontium (Sr) isotope ratio determination can be used to verify the origin of such food products and it has thus become an important technique. Wine samples in particular are often investigated using this technique. Sr isotopic ratio measurements are often disturbed by isobaric Rb interference, making a separation procedure necessary. In this investigation a very simple and effective procedure for the separation of Rb + and Sr 2+ ions for Sr isotope ratio determination in mineral water and wine samples was developed. Methods The classical Sr‐carbonate precipitation reaction for the separation of Sr 2+ ions from highly soluble Rb + ions was used. For liquid samples, such as mineral water or wine, a prior digestion is not required. This sample preparation procedure was successfully applied for Sr isotope measurements on a widely available quadrupole‐based inductively coupled plasma mass spectrometry (ICP‐MS) device in combination with the Concentration‐Gradient‐Method (CGM). Results The separation achieved Sr/Rb concentration ratios of 50,000 to 150,000 in water and wine samples. The addition of Ca 2+ ions to co‐precipitate with the traces of Sr improved the Rb separation and the reproducibility of isotope ratio determination to an uncertainty of ±0 . 4 ‰ (single standard deviation). This sample preparation approach achieved 2 to 6 times better Rb separation than the commonly applied ion‐exchange resin materials. Conclusions The quality of the separation is only limited by the number of precipitation repetitions. Moreover, the applicability of quadrupole‐based ICP‐MS for the characterisation of samples with respect to their origin by means of Sr isotope ratio determination was demonstrated.
    Type of Medium: Online Resource
    ISSN: 0951-4198 , 1097-0231
    URL: Issue
    URL: Article
    DOI: 10.1002/rcm.v32.2
    DOI: 10.1002/rcm.8018
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2002158-6
    detail.hit.zdb_id: 58731-X
    SSG: 11
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Concentration‐Gradient‐Method for sulphur and strontium isotope ratio determination by quadrupole‐based inductively coupled plasma mass spectrometry in gypsum
    Wiley ; 2018
    In:  Rapid Communications in Mass Spectrometry Vol. 32, No. 7 ( 2018-04-15), p. 567-575
    Details
    In: Rapid Communications in Mass Spectrometry, Wiley, Vol. 32, No. 7 ( 2018-04-15), p. 567-575
    Abstract: The concentration‐gradient‐method (CGM) was previously introduced as a precise and accurate method for isotope ratio determination by quadrupole‐based inductively coupled plasma mass spectrometry (ICP‐QMS). The investigation of its potential and advantages in the analysis of analytes with a poor signal‐noise ratio (S/N) is important to establish routine isotope ratio analysis industrial applications on these widely used instruments. Methods The CGM was applied on isotope measurements of Sr near its limit of quantification (LOQ) and of sulphur where there was a massively interfered 32 S isotope signal in gypsum samples of different origin, in order to demonstrate the advantages of the CGM over the commonly used measurement and evaluation approach. The comparison between the CGM and the classical measurement and evaluation approach was performed with high and low concentration Sr standard solutions, to prove the robustness of the isotope ratio determination. Results In both cases the CGM reached a recovery rate of approximately 103 %, whereas the classical approach became increasingly inaccurate at lower S/N (recovery of 123 %). In the case of sulphur isotope ratio determination only the CGM enabled a differentiation between geogenic and flue gas desulphurisation plant‐originated gypsum samples. Conclusions The robustness of the CGM approach was illustrated for gypsum samples with trace strontium concentration and its general applicability to the determination of sulphur isotope ratios by means of quadrupole‐based ICP‐MS was demonstrated using the example of sulphur in gypsum.
    Type of Medium: Online Resource
    ISSN: 0951-4198 , 1097-0231
    URL: Issue
    URL: Article
    DOI: 10.1002/rcm.v32.7
    DOI: 10.1002/rcm.8067
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2002158-6
    detail.hit.zdb_id: 58731-X
    SSG: 11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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