Comparative Strategies for Correction of Interferences in Isotope Dilution Mass Spectrometric Determination of Vanadium

Abstract

Vanadium has been determined in SRM 1573a, Tornato Leaves, by isotope dilution mass spectrometry using thermal ionization (TIMS) and resonance ionization (RIMS). The capabilities of the two techniques to compensate for interferences from chromium and titanium are compared. For thermal ionization, corrections to the m/e 50 signal of 13-60% were made for interferences. The resulting V concentration had a relative standard deviation of 1.2%. Regression analysis of the data identified second-order corrections that resulted in a betweensample precision of 0.46%. Resonance ionization had a demonstrated specificity of 2000:1 against Cr and Ti interferences. The resulting ratio measurements were less precise than the thermal ionization, but the vanadium ratio could be measured directly with no corrections necessary for interferences. The concentration (± 1 measurement uncertainty) for V determined was 835.4 ± 3.8 ppb by TIMS with second-order interference corrections, 824 ± 10 ppb by TIMS as initially measured, and 828 ± 15 ppb as measured by RIMS.

Determination of Picogram Quantities of Vanadium in Calcite and Seawater by Isotope Dilution Inductively Coupled Plasma Mass Spectrometry with Electrothermal Vaporization

“…The signals at m/z 49.5, 49, and 52 were monitored in order to correct for background and isobaric interferences. 50 Ti and 50 Cr were estimated by measuring 49 Ti and 52 Cr and using the natural isotopic abundance ratios 50 Ti/ 49 Ti = 0.954 and 50 Cr/ 52 Cr = 0.051 86 to determine the appropriate correction factor . Two blocks of data with 10 individual ratio measurements of 5 s integration were taken for each sample.…”

Removal of isobaric interferences in isotope dilution analysis of vanadium in silicon nitride fine ceramics powder by DRC-ICP-MS

“…Some research on classical matrix separations of concomitant Ti and Cr from V with an ion exchange resin have been reported in the literature. [3][4][5] However, the separation efficiencies in the literature were not satisfactory and required numerical correction by 49 Ti and 53 Cr.…”