Determination of calcium in food samples; application of interference suppressing reagent to atomic absorption spectrophotometric method, 2: Application to food samples containing aluminium
1991
Yasui, A. (National Food Research Inst., Tsukuba, Ibaraki (Japan))
Effect of aluminum, phosphate and magnesium on the absorbance of calcium at 422.6nm in acetylene-air flame was studied using a composite matrix. Interference action of aluminum was similar to that of phosphate, and simple additivity in interference was observed when both components coexisted. In the presence of two-fold weight of aluminum to calcium, calcium could be measured without interference by addition of 0.3%, 0.6% of strontium and 1.0% of lanthanum at P/Ca ratios of 0-10, 10-20 and 20-60, respectively. Mineral elements in samples containing a relatively high level of aluminum (shell of groundnut, leaves and bulbs of waterhyacinth, fungus "amigasatake", "shoyuzuke" of fruit of eggplant, leaves of tea and hydrangea) were measured after dry ashing. Among them the fungus had maximum ratios of Al/Ca and P/Ca; 2.1 and 36, respectively. The proposed method could be applicable to these samples
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