Determination of isotopic composition of boron

Ramakumar, K. L.; Parab, A.R.; Khodade, P. S.; Almaula, A. I.; Chitambar, S. A.; Jain, H. C.

doi:10.1007/bf02199553

Cited by 45 publications

(20 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Another paper describing the thermal ionization mass spectrometry of Cs2B407 has recently been published (15). In general, the experimental techniques and results are consistent with the work reported here.…”

supporting

confidence: 92%

Determination of boron isotope ratios by thermal ionization mass spectrometry of the dicesium metaborate cation

Spivack¹,

Edmond²

1986

Anal. Chem.

199

102

View full text Add to dashboard Cite

A method for the high-preclslon determinatlon of the lsotoplc composttlon of boron by thermal ionization mass spectrometry of Cs2B,0, b descrlbed. The method Is capable of producing Isotope ratlo analysis wlth a standard deviation of 0.12%0. Procedures for the separation and chemical isoiatlon of boron from silicates and aqueous solutions are also descrlbed. Careful attention has been pald to the analysis of blanks and other procedural artifacts.Large variations (-50%) in the isotopic composition of boron occur in nature (1-3). These variations can be used as a diagnostic geochemical tool and tracer. However, the development of boron isotope geochemistry has been severely limited by the relatively poor precision of analytical methods used to determine the isotope ratio. By modification of existing techniques a reproducible, high-precision, solid-source thermal ionization technique has been developed and used to analyze aqueous and solid-phase sample8 of geological interest.Though a variety of techniques have been used to determine the isotopic composition of boron (4-14), the NazB4O7 thermal ionization mass spectrometric method (10,12) has been almost exclusively used in boron isotope geochemistry. Uncertainties (20) of 2-3%0 in the l1B/l0B ratio have routinely been reported (1, 2, 10, 12). The method described here, based on the thermal ionization mass spectrometry of Cs2B407, is capable of producing data with an uncertainty of 0.25% (20). The mass spectrometric technique and extraction procedures for isolating boron from aqueous solutions and silicates are described in this paper.Another paper describing the thermal ionization mass spectrometry of Cs2B407 has recently been published (15). In general, the experimental techniques and results are consistent with the work reported here. Both illustrate the advantages of this method compared to standard techniques. However, the work reported here contains a more detailed investigation of analytical reproducibility and of sample preparation techniques. EXPERIMENTAL SECTIONInstrumentation. Mass Spectrometry. All isotopic determinations were performed on a first-order, direction-focusing mass spectrometer that has a 60", 12 in. radius magnetic sector and operates at a nominal resolving power of -430. A Faraday cup collector and a 9.2 X 1O1O Q resistor were used. The accelerating voltage was 3900 V. Single-filament beads (Cathodeon, Cambridge, England) with tantalum filaments (0.025 x 0.50 mm) were used.Ion Chromatography. A Wescan Model 262 ion chromatograph was used with a 25-cm Anion/R column utilizing an eluant of 0.1 mM potassium hydrogen phthalate adjusted to pH 11.5 with sodium hydroxide.Pyrohydrolysis. The complete pyrohydrolysis apparatus is shown in Figure 1. The furnace is a Lindbergh Model 54233 with a Model 54545 controller. The combustion tube is 99.8% alumina manufactured by McDanel Refractories (Beaver Falls, PA) with an outer diameter of 3/4 in. and an inner diameter of in. The connectors are Cajon Ultratorr made of 316 stainless steel, which we machine...

show abstract

supporting

confidence: 92%

Determination of boron isotope ratios by thermal ionization mass spectrometry of the dicesium metaborate cation

Spivack¹,

Edmond²

1986

Anal. Chem.

199

102

View full text Add to dashboard Cite

show abstract

“…-6R57/55/{R57/55(1 -L2R57/55)) (8) For our sample, the theoretical calculations using Eqns (7) and (8) show that the relative error ratio, ( 6 Y / Y ) / ( 6 R I R ) is around unity for both the cases. This itself is sufficient to explain the corresponding experimental results which do not have any magnification of the measurement errors (see Table 2).…”

Section: (7)mentioning

confidence: 95%

Molecular ion beam method of isotopic analysis: Effect of error propagation, a case study with Li₂BO

Datta

Khodade

Parab

et al. 1993

Rapid Comm Mass Spectrometry

Self Cite

View full text Add to dashboard Cite

The isotopic analysis of boron has been carried out using dflerent pairs of isotopic Li2BO: ions as monitors. The precision of the mass spectrometric measurements of different molecular abundance ratios is roughly the same. However, the values of the '%/"B abundance ratio calculated from the experimental ratios of different pairs of isotopic molecular ions show large variations. These variations are shown to be a logical consequence of the calculation step which leads to the magnification of measurement errors to different extents for different peak ratios. Similar arguments would apply for the isotopic analysis of any element employing the molecular ion beam technique. The effect of isotopic fractionation on the molecular abundances is also discussed. The important implication of the present investigation is that it sets the guidelines for selecting suitable monitor molecules to avoid such errors.Molecular ion beams are sometimes employed for the isotopic analysis of elements. ' -12 The related analytical procedure is, by and large, comparable to the conventional atomic ion beam method of isotopic analysis. However, the molecular ion beam method involves (barring those cases where all other constituents of the chosen molecule except the element of interest are monoisotopic) calculations of elemental isotopic abundance ratio(s) from the experimentally measured molecular ion ratio(s) using known isotopic abundance values of the other constituent elements. The central theme of this paper is to pay attention to this calculation step. This is because the calculation process may either enhance or even reduce the error in isotopic analysis due to error propagation, as indicated in Ref.12 which dealt with the determination of the 6Li/7Li abundance ratio using the Li2B02 molecule with all constituent isotopes at their natural isotopic abundance. It was demonstrated" that the precision of the measurements of the intensity ratio of the most abundant Li,BO: ions (mlz 56 and 57) is better than 0.1% , while the uncertainty in the value determined for the 6Li/7Li abundance ratio is 0.3%. The present work involves the isotopic analysis of a "B-enriched isotopic reference material of boron, SRM-952. This was chosen with a view to examining whether the selection of the most abundant Li,BO: ions as monitors also ensures accurate isotopic analysis of a constituent element whose isotopic abundance ratios are quite different from the natural ratios. This paper presents the loB/'lB abundance ratios determined using the experimental intensity ratios of different pairs of isotopic molecular ions and discusses the differences in the results so obtained. EXPERIMENTALThe instrument used is a thermal ionization mass spectrometer, model 261 (Finnigan MAT, Bremen, Germany), upgraded for simultaneous collection of separated ion beams.Author to whom correspondence should be addressed.The lithium sample used for this work was Li2C03, a natural isotopic standard of lithium Svec with certified 6Li/7Li abundance ratio of 0.0832 k 0.0002. l3 The ...

show abstract

“…Instead, alkali metal borate ions (M 2 BO 2 + ) are conventionally used for P‐TIMS analysis of boron isotopes (DeBievre & Debus, ; Xiao, Beary, & Fassett, ; Vengosh et al, ; Nakano & Nakamura, ; Xiao & Wang, ; Ishikawa & Nagaishi, ). Different alkali metals (Li, Na, K, Rb, and Cs) have been used to generate positive meta‐borate ions (Ramakumar et al, ; Spivack & Edmond, ; Nakamura et al, ; Ding & Zhao, ; Sahoo & Masuda, ; Catanzaro et al, ; Deyhle, ; Rao et al, , ). To efficiently generate M 2 BO 2 + ions and reduce the intensity of alkali metal ions, a special loading procedure (e.g., loading of graphite as a promoter and an optimum B/alkali metal mole ratio) needs to be employed.…”

Section: Mass Spectrometric Techniques Used To Analyze Boronmentioning

confidence: 99%

A review on the determination of isotope ratios of boron with mass spectrometry

Aggarwal

You

2016

Mass Spectrometry Reviews

View full text Add to dashboard Cite

The present review discusses different mass spectrometric techniques-viz, thermal ionization mass spectrometry (TIMS), inductively coupled plasma mass spectrometry (ICPMS), and secondary ion mass spectrometry (SIMS)-used to determine B/ B isotope ratio, and concentration of boron required for various applications in earth sciences, marine geochemistry, nuclear technology, environmental, and agriculture sciences, etc. The details of the techniques-P-TIMS, which uses Cs BO , N-TIMS, which uses BO , and MC-ICPMS, which uses B ions for bulk analysis or B and B ions for in situ micro-analysis with SIMS-are highlighted. The capabilities, advantages, limitations, and problems in each mass spectrometric technique are summarized. The results of international interlaboratory comparison experiments conducted at different times are summarized. The certified isotopic reference materials available for boron are also listed. Recent developments in laser ablation (LA) ICPMS and QQQ-ICPMS for solids analysis and MS/MS analysis, respectively, are included. The different aspects of sample preparation and analytical chemistry of boron are summarized. Finally, the future requirements of boron isotope ratios for future applications are also given. Presently, MC-ICPMS provides the best precision and accuracy (0.2-0.4‰) on isotope ratio measurements, whereas N-TIMS holds the potential to analyze smallest amount of boron, but has the issue of bias (+2‰ to 4‰) which needs further investigations. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 36:499-519, 2017.

show abstract

Determination of isotopic composition of boron

Cited by 45 publications

References 6 publications

Determination of boron isotope ratios by thermal ionization mass spectrometry of the dicesium metaborate cation

Determination of boron isotope ratios by thermal ionization mass spectrometry of the dicesium metaborate cation

Molecular ion beam method of isotopic analysis: Effect of error propagation, a case study with Li₂BO

A review on the determination of isotope ratios of boron with mass spectrometry

Contact Info

Product

Resources

About

Determination of isotopic composition of boron

Cited by 45 publications

References 6 publications

Determination of boron isotope ratios by thermal ionization mass spectrometry of the dicesium metaborate cation

Determination of boron isotope ratios by thermal ionization mass spectrometry of the dicesium metaborate cation

Molecular ion beam method of isotopic analysis: Effect of error propagation, a case study with Li2BO

A review on the determination of isotope ratios of boron with mass spectrometry

Contact Info

Product

Resources

About

Molecular ion beam method of isotopic analysis: Effect of error propagation, a case study with Li₂BO