Abstract
A precipitation reaction for alkali metal ions is proposed. Crown ether complexes of alkali metal ions were found to be less soluble than the alkali metal ions themselves in water when they form ion association complexes with tetraphenylborate ion (TPB−) as a counter ion. The apparent solubility products ( K′ sp) of alkali metal ions were determined; they were 10–100 times smaller than K sp values of the ion association complexes formed between alkali metal ion and TPB−. On the basis of the precipitation reaction, a flow-injection method for the spectrophotometric determination of potassium in water samples is proposed. Samples were injected into a carrier stream, which merged with a reagent stream containing TPB, 18-crown-6, EDTA and saturated potassium ion. The calibration graph was linear in the range 0–1 × 10 −4 M potassium ion. The sample throughput was 30 h −1. The procedure was applicable to river and tap waters.
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