On-line Pervaporation Separation Process for the Potentiometric Determination of Fluoride in Dirty Samples
A selective method for the determination of fluoride in contaminated samples based on pervaporation of a volatile derivative and potentiometric monitoring of the anion after collection in a basic solution has been developed. Fluoride was converted to volatile trimethylfluorosilane by reaction with h...
| Authors: | ; ; |
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| Format: | Article |
| Status: | Published version |
| Publication date: | 1995 |
| Country: | España |
| Institution: | Universidad de La Rioja (UR) |
| Repository: | RIUR. Repositorio Institucional de la Universidad de La Rioja |
| OAI Identifier: | oai:portal.dialnet.es:doc/5bbc68c4b750603269e80f2c |
| Online Access: | https://investigacion.unirioja.es/documentos/5bbc68c4b750603269e80f2c |
| Access Level: | Open access |
| Keyword: | dirty samples fluoride pervaporation potentiometry |
| Summary: | A selective method for the determination of fluoride in contaminated samples based on pervaporation of a volatile derivative and potentiometric monitoring of the anion after collection in a basic solution has been developed. Fluoride was converted to volatile trimethylfluorosilane by reaction with hexamethyldisilazane, and absorbed in dilute NaOH solution. Both the continuous and stopped-flow modes were used in order to accomplish a variable efficiency of the separation process thus enlarging the determination range which was established between 5 and 100 mg l -1, the precision ranging between 2.60 and 3.58%. The determination of the analyte in samples from different sources (i.e., tap water, well water, fertilizers and ceramic industry wastewater) testifies to its usefulness. |
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