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《Chinese Journal of Analysis Laboratory》 2009-02
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Determination of calciun in silicon iron by discoloring spectrophotometry with Picramine CA

ZHONG Guo-xiu1,2, HUANG Qing-hua3 and YANG Hao-yi1,2 (1. Hubei Reserch & Designing Institute of Mechanical Electronic Engineering, Wuhan 430070; 2. Hubei University of Technology, Wuhan 430070; 3. Hubei Reserch & Designing Institute of Building Material, Wuhan 430071)  
A sensitive spectrophotometric method was developed to determine calcium, based on the discoloring reaction of calcium-Picramine CA system in pH 11.0 NH3·H2O-NH4Cl medium and linear relationship of the discoloring degree with the certain concentration range of calcium. The factors such as absorption spectra、 acidity、 concentrations of reagent、 influence of coexisting ions on the reaction are discussed, and the optimal reaction conditions are established. Beer′s law was obeyed in the range of 8~90 μg/25 mL for calcium with an apparent molar absorptivity of 1.26×104 L·mol-1·cm-1. The proposed method has been applied to the determination of calcium in silicon iron. The RSDs (n=5) are between 1.4% and 2.1%.
【CateGory Index】: TG115.3
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