On-line ion-exchange separation and determination of niobium, tantalum, tungsten, zirconium and hafnium in high-purity iron by flow injection inductively coupled plasma mass spectrometry
✍ Scribed by Aurora G. Coedo; Teresa D. López; F. Alguacil
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 671 KB
- Volume
- 315
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A study was made to investigate the feasibility of using an anion-exchange resin for on-line separation of trace amounts of niobium, tantalum, tungsten, zirconium and hafnium from iron matrix samples. The incorporation of a micro-column packed with Dowex 1X8-100 ion-exchange resin into a flow injection system is presented. The detection was done with inductively coupled plasma mass spectrometry (ICP-MS). The sample treatment, optimization of analytical variables and measurable concentration levels are discussed. Recoveries from standard additions to a high-purity iron were for all the analytes close to lOO%, with relative standard deviations ranging from 0.7 to 3.0%. The limits of quantification (10 s,_ r) calculated from a 5% (m/v) iron sample solution were 8, 5, 14, 12 and 10 ng g-t for Nb, Ta, W, Zr and Hf, respectively. The accuracy of the proposed method was tested by determining these elements in Euronorm-CRM 098-l reference material. Recoveries from 0.250 g test portions of the above reference material spiked with 2.5 and with 12.5 ng each of the five analytes are reported.