Turbidimetric Determination of Potassium by Flow Injection Analysis

A turbidimetric flow injection analytical method was developed for the determination of potassium (K) after precipitation with a 3% sodium tetraphenylboron solution at pH 9. The minimum detection limit is about 1.0 μg K/mL. Calibration graphs of absorbance versus concentration are linear up to 20 μg...

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Veröffentlicht in:	Analytical letters 1994-06, Vol.27 (8), p.1625-1636
Hauptverfasser:	de Oliveira Torres, José Roberto, Tubino, Matthieu
Format:	Artikel
Sprache:	eng
Schlagworte:	Analytical chemistry Chemistry Exact sciences and technology flow injection potassium Spectrometric and optical methods tetraphenylboron turbidimetry
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	A turbidimetric flow injection analytical method was developed for the determination of potassium (K) after precipitation with a 3% sodium tetraphenylboron solution at pH 9. The minimum detection limit is about 1.0 μg K/mL. Calibration graphs of absorbance versus concentration are linear up to 20 μg K/mL with a correlation coefficient of 0.9982. The average sampling rate is about 60 samples per hour. Relative standard deviations (s%) obtained with standard solutions of potassium are ca. 1%. Several samples of plant leaves, bottle mineral waters and serum rehydration solutions were analyzed. * From the PhD Thesis of J.O.R.T.
ISSN:	0003-2719 1532-236X
DOI:	10.1080/00032719408006394