Preconcentration and determination of organophosphonic acids: application to natural waters

✍ Scribed by E. Frigge; E. Jackwerth

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 638 KB
• Volume: 254
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(91)90010-3

✦ Synopsis

Methods for the preconcentration of phosphor& acids from natural waters were systematically tested. The major concepts are enrichment by adsorption on collector precipitates (metal hydroxides and carbonates) and on adsorption resins and exchange celluloses. By adsorption on bismuth hydroxide, all phosphor& acids tested (some of them after separation of the collector cation) can be enriched by a factor of lo-25 from solutions with low chloride contents. More powerful is enrichment by means of adsorption resins or exchange celluloses, but this works only for two of the phosphonic acids investigated. With these methods, enrichment factors of 50400 (sample volume 250 ml-2 1) can be achieved. The detection limit of these methods is ca. 0.5 ng ml-' with a sample volume of 250 ml. The final determination of the phosphonic acids is performed by ion chromatography.