✦ LIBER ✦

Flow-injection determination of traces of potassium by extraction with bis[2-(5′-bromo-2′-pyridylazo)-5-(N-propyl-N-sulphopropylamino)phenolato]cobaltate(III) and cryptand[2.2.2]

✍ Scribed by Hiromichi Yamada; Ikuo Kobayakawa; Akio Yuchi; Hiroko Wada

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 592 KB
Volume: 281
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(93)85343-i

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✦ Synopsis

The determination of trace amounts of potassium ion was carried out by liquid-liquid extraction using cobalt(II1) 2_(5'-bromcF2'-~dylazo)_5_(N-p~~1-N-su1phopropy~~no~heno1ate and cryptan42.2.21 with a flow-injection system. The determination of potassium ion in the range from tens to several hundred cg I-' was possible with a sampling frequency of 30 h-'. The detection limit for potassium at a signal-to-noise ratio of 3 was 4.0 X lo-' M (16 pg 1-t). Interferences from alkaline earth and heavy metal ions could be avoided by adding dilithium EDTA to the sample and/or reagent solutions. The results obtained for botanical reference materials were in good agreement with the certified values.

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