Investigation of Interference by Inorganic Phosphate on Coprecipitation of Cadmium, Copper, Manganese and Lead in Water with Zirconium Hydroxide

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The interference effect of PO_4^<3-> on the recovery of Cd, Cu, Mn and Pb in water during determination by coprecipitation with Zr(OH)_4 followed by flame atomic absorption spectrometry (FAAS) was investigated. Free PO_4^<3-> in water, from 0.125 to 1.5 mg/ml, exhibited weak interference on the recovery of these metals, giving rise to errors of a few to several percent in the direct FAAS analysis. In the coprecipitation method, Zr^<4+> showed an unfavorable property to FAAS, forming a precipitate of phosphate which was insoluble to both water and (1+1) HCl. The above problems were solved by precipitating PO_4^<3-> with Zr^<4+> followed by washing the precipitate with (1+1) HCl, solubilizing the coprecipitated metals quantitatively, and removing PO_4^<3-> by centrifugation as acid-insoluble Zr^<4+> salt.
社団法人日本薬学会の論文
1989-08-31