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Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences.

Publication ,  Journal Article
Eisenhut, S; Heumann, KG; Vengosh, A
Published in: Analytical and bioanalytical chemistry
March 1996

A technique for precise boron isotope ratio measurements with a high detection power has been developed by negative thermal ionization mass spectrometry (NTIMS). Relative standard deviations in the range of 0.03-0.3% have been obtained for the determination of the (11)B/(10)B isotope ratio using nanogram amounts of boron. Ba(OH)(2) has been applied as ionization promoter for the formation of negative thermal ions. By adding MgCl(2) better reproducibilities of the measurement have been achieved. A possible interference of BO(-)(2) ions at mass number 42 by CNO(-) could be excluded by the sample preparation technique used. Contrary to other NTI techniques no dependence of the measured isotope ratio on the boron amount used has been observed. Anthropogenic and natural saline influences in ground water have been successfully identified by boron isotope ratio determinations with this NTIMS method, due to the different isotopic composition of boron in natural and anthropogenic substances. In sewage, the boron isotope ratio is substantially influenced by washing powder, which contains low (11)B/(10)B ratios (expressed in delta(11)B values normalized to the standard reference material NIST SRM 951). In contaminated ground water, low delta(11)B values are normally correlated with high boron and high chloride concentrations. On the other hand, delta(11)B shifts to higher values in less contaminated samples. For ground water with saline influences, only the delta(11)B determination, and not the boron or chloride content, allowed the correct identification of this natural source of contamination.

Duke Scholars

Published In

Analytical and bioanalytical chemistry

DOI

EISSN

1618-2650

ISSN

1618-2642

Publication Date

March 1996

Volume

354

Issue

7-8

Start / End Page

903 / 909

Related Subject Headings

  • Analytical Chemistry
  • 40 Engineering
  • 34 Chemical sciences
  • 31 Biological sciences
  • 09 Engineering
  • 06 Biological Sciences
  • 03 Chemical Sciences
 

Citation

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MLA
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Eisenhut, S., Heumann, K. G., & Vengosh, A. (1996). Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences. Analytical and Bioanalytical Chemistry, 354(7–8), 903–909. https://doi.org/10.1007/s0021663540903
Eisenhut, S., K. G. Heumann, and A. Vengosh. “Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences.Analytical and Bioanalytical Chemistry 354, no. 7–8 (March 1996): 903–9. https://doi.org/10.1007/s0021663540903.
Eisenhut S, Heumann KG, Vengosh A. Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences. Analytical and bioanalytical chemistry. 1996 Mar;354(7–8):903–9.
Eisenhut, S., et al. “Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences.Analytical and Bioanalytical Chemistry, vol. 354, no. 7–8, Mar. 1996, pp. 903–09. Epmc, doi:10.1007/s0021663540903.
Eisenhut S, Heumann KG, Vengosh A. Determination of boron isotopic variations in aquatic systems with negative thermal ionization mass spectrometry as a tracer for anthropogenic influences. Analytical and bioanalytical chemistry. 1996 Mar;354(7–8):903–909.
Journal cover image

Published In

Analytical and bioanalytical chemistry

DOI

EISSN

1618-2650

ISSN

1618-2642

Publication Date

March 1996

Volume

354

Issue

7-8

Start / End Page

903 / 909

Related Subject Headings

  • Analytical Chemistry
  • 40 Engineering
  • 34 Chemical sciences
  • 31 Biological sciences
  • 09 Engineering
  • 06 Biological Sciences
  • 03 Chemical Sciences