• P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

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    Determination of Li by Isotope Dilution Inductively Coupled Plasma Mass Spectrometry

    Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
    1995, v.8 no.4, pp.427-434
    Park, Chang J.
    Chung, Bag S.
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    Abstract

    Inductively coupled plasma mass spectrometry combined with the isotope dilution method is used for the determination of lithium. The isotope dilution method is based on the addition of a known amount of enriched isotope (spike) to a sample. The analyte concentration is obtained by measuring the altered isotope ratio. The spike solution is calibrated through so called reverse isotope dilution with a primary standard. The spike calibration is an important step to minimize error in the determined concentration. It has been found essential to add spike to a sample and the primary standard so that the two isotope ratios should be as dose as possible. Since lithium is neither corrosive nor toxic, lithium is used as a chemical tracer in the nuclear power plants to measure feedwater flow rate. 99.9% <TEX>$^7Li$</TEX> was injected into a feedwater line of an experimental system and sample were taken downstream to be spiked with 95% <TEX>$^6Li$</TEX> for the isotope dilution measurements. Effects of uncertainties in the spike enrichment and isotope ratio measurement error at various spike-to-sample ratios are presented together with the flow rate measurement results in comparison with a vortex flow meter.

    keywords
    ICP-MS, isotope dilution, lithium, chemical tracer, flow rate


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