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In the atomic absorption spectrometry using an air-acetylene flame, the interferences of Zr, Sn, Al, Sb, SO42-, VO3-, and SiO32-, on the calcium absorption and the repression of this interference by the addition of cerium have been studied. The interference by Zr, Sn, Al, Sb, SO42-, VO3- and SiO32- existed as the same concentration as calciurn (3.0 × 10-4M) in the sample solution are completely released by the addition of cerium twice as much as interfering cation. The interferences by the mixed interfering cations (Zr, Sn, Al and Sb) and by the mixed interfering anions (SO42-, VO3- and SiO32-) are larger than by each interfering cation and anion, and the releasing effect by cerium (1.5 × 10-2M) is effective up to some degree of the concentration of mixed interfering cations and of mixed interfering anions. The releasing effect by cerium to the mixed solution of interfering cations and anions is applicable to quite wide range of concentration.
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