Indirect spectrophotometric determination of potassium ion in water based on the precipitation with tetraphenylborate ion and a crown ether using flow injection
✍ Scribed by Shoji Motomizu; Ko Yoshida; Kyoji Tôei
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 552 KB
- Volume
- 261
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A preclpltatlon reaction for alkah metal Ions IS proposed Crown ether complexes of alkah metal 1011s were found to be less soluble than the alkah metal Ions themselves m water when they form Ion assoclatlon complexes with tetraphenylborate Ion (TPB-) as a counter Ion The apparent solubdlty products (K&J of alkali metal ions were determined, they were lo-100 times smaller than K,, values of the Ion association complexes formed between alkali metal Ion and TPB-On the basis of the preclpltation reaction, a flow-mjectton method for the spectrophotometrlc determmatlon of potassmm m water samples IS proposed Samples were Injected mto a carrter stream, which merged with a reagent stream contammg TPB, 18-crown-6, EDTA and saturated potassmm ion The cahbratlon graph was linear m the range O-l x 10m4 M potassium Ion The sample throughput was 30 h-' The procedure was apphcable to river and tap waters