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 ofabsorbance 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. © 1994 by Marcel Dekker, Inc.27816251636Flaschka, H., Barnard, A.J., Tetraphenylboron (TPB) as an Analytical Reagent (1960) Advances In Analytical Chemistry and Instrumentation, 1, pp. 1-117. , in Reilley, C.N, Interscience Publishers Inc., New YorkKarnnan, K.J., Bladh, E., Gedda, P., (1959) Mikrochim. Acta (Wien), p. 779Gregorowicz, Z., Buhl, F., (1961) Mikrochim. Acta (Wien), p. 129Jain, I.M., Sarkar, M.C., (1976) Fert. Technol, 13, p. 50Tubino, M., Torres, J.R.O., (1992) Commun. Soil Sei. Plant Anal, 23, p. 123Motomizy, S., Yoshida, K., Tóei, K., (1992) AnaL Chim. Acta, 261, p. 225Tubino, M., Barros, F.G., (1991) Quím Nova, U, p. 49Tubino, M., Torres, J.R.O., (1990) Anal Lett, 73, p. 2339Eckschlager, K., (1972) Errors, Measurements and Results In Chemical Analysis, pp. 107-112. , Chalmers, R. A. ed1, ed., Van Nostrand Reinhold, New Yor