Atomization by direct heating of metal-adsorbed ion-exchange resin in atomic absorption spectrometry

NAKANO Kunio, TAKADA Takeo, KAKUTA Takaharu

doi:10.2116/bunsekikagaku.28.5_325

For the determination of trace metal elements by atomic absorption spectrometry, the direct heating and atomization of the metal-adsorbed ion-exchange resin has been attempted. The ion-exchange resin (Wg) is put into the sample solution (V l) of the metal ion concentration C, and the system is brought to equilibrium. Then, ωg of resin is taken out, dried, and mounted on the carbon furnace atomizer. The absorbance due to the metal is theoretically proportional to VωC/W. Two peaks appear on the absorbance chart. The first peak (P₁) appears in the "Ashing" period, and the second peak (P₂) appears in the "Atomizing" period. Since the mean value of intensity ratio P₂/P₁ of the H-type resin was 0.33, the absorbance of the metal is estimated to be (P₂-0.33P₁)/ P₁, assuming that the resin amount ω is proportional to P₁. Although the analytical results by this method have low precision, it is possible to analyze a copper solution of a very low concentration such as 0.05 ppb.

Atomization by direct heating of metal-adsorbed ion-exchange resin in atomic absorption spectrometry

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