Rapid analysis of magnesium, potassium and calcium contents in feedstuffs, 2: Colorimetric and turbidimetric determination of magnesium, potassium and calcium
2007
Nishiguchi, Y.(National Agricultural Research Center for Western Region, Fukuyama, Hiroshima (Japan)) | Ohsaka, T. | Ando, S. | Hayasaka, K. | Ikeda, J. | Hori, K. | Suga, Y. | Fukunaga, A.
The reliability of a colorimetric determination of magnesium: (Mg) and calcium (Ca), and a turbidimetric determination of potassium (K) were evaluated. The concentrations of Mg, K and Ca were determined with xyldil blue (XB), tetraphenylboron (TPB) and orthocresolphthaleincomplexone (OCPC) method, respectively. The detective range of each element was followed; Mg 1.25mg/dl, K 6.25mg/dl, and Ca 2.5mg/dl. These colorimetric determinations of XB and OCPC methods were specific for Mg and Ca, and no interference with other elements was observed. The determination of K was slightly interference with other elements. XB and OCPC methods were applied both dry-ashing and HCl extraction samples, however, K content measured by TPB method using HCl extraction samples had tendency to underestimate than those using ashing samples. Therefore, the determination of K in HCl extraction samples needs to assay the K concentration of sample as control simultaneously.
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