炭素炉原子吸光法によるピコグラム以下の亜鉛定量における問題点

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Although atomic absorption spectrometry of zinc is highly sensitive, its precision and accuracy are decreased on account of the zinc contamination from the environment or the strong interferences of concomitant acids when carbon rod is applied as the atomization tool. The authors, therefore, checked the contamination of zinc in the distilled or deionized water which is used as the media diluting the sample, and examined the acid interference in zinc atomic absorption at ppb level. In the present study, atomic absorption spectrophotometer, with a D_2 lamp background compensation circuit, and a carbon rod atomizer were employed. Analytical line for zinc atomic absorption was 213.9 nm, and spectral slit width was 1.1 nm. Among the hydrochloric, sulfuric, and nitric acid, the. hydrochloric. acid most suppresses the atomic absorption peak of 0.05 ng zinc. Under the coexistences of these acids, the peak height of zinc atomic absorption is complicatedly varied against the change in the ashing temperature of carbon rod. The distilled or deionized water obtained by the ordinary methods contain (0.2〜1) ppb zinc as the contaminant. Conversely, the sub-oiled water obtained from the sub-boiling distiller by (Daiken Quartz Co., Ltd.) contain zinc below 0.02 ppb, and is suitable for the trace analysis of zinc. The sub-boiled water stocked over two weeks in the polyethylene container which was beforehand soaked in 1: 1 nitric acid is free from the zinc contamination. During the sixty times of repetitions of zinc measurements in 5μl sub-boiled water, the high atomic absorption peaks ascribed to the zinc contamination sometimes appeared, which corresponded with the zinc content over 0.05 ppb. This can be interpreted as the zinc contamination in the carbon rod or the pipet used in mounting the sample. The present result suggests that the zinc determination at sub-ppb level includes unexpectable error over 100%.
社団法人日本分析化学会の論文
1977-12-05

炭素炉原子吸光法によるピコグラム以下の亜鉛定量における問題点

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