Masking of zirconium(IV) in the determination of fluoride with an ion-selective electrode: application to zirconium(IV) fluoride-based glasses
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 116 (1) , 45-48
- https://doi.org/10.1039/an9911600045
Abstract
The performance of six chelating reagents [ethylenediamine-N,N,N′,N′-tetraacetic acid (EDTA); trans-1,2-cyclohexanediamine-N,N,N′,N′-tetraacetic acid (CDTA); N′-(2-hydroxyethyl)ethylenediamine-N,N,N′-triacetic acid (HEDTA); triethylenetetraamine-N,N,N′,N″,N,N-hexaacetic acid (TTHA); diethylenetriamine-N,N,N′,N″,N-pentaacetic acid (DTPA); and citrate] has been studied for masking zirconium(IV) in the determination of fluoride with an ion-selective electrode. Citrate was not suitable because it produced a prolonged electrode response. Of the aminopolycarboxylates, DTPA has a much greater masking ability than the others. Using DTPA at pH 5–6, fluoride was successfully determined at a concentration of 1 × 10–5 mol dm–3 in the presence of up to 4 × 10–6 mol dm–3 zirconium(IV). The proposed method was applied to the analysis of a number of zirconium(IV) fluoride compounds and ZrF4-based glasses after fusion with sodium carbonate.Keywords
This publication has 0 references indexed in Scilit: