低温灰化法における元素の損失

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書誌事項

タイトル別名
  • Loss of the elements in low temperature plasma ashing
  • テイオン ハイカホウ ニ オケル ゲンソ ノ ソンシツ

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説明

Recentry, the low temperature plasma ashing method has been employed as a decomposition method of organic materials for elementary analysis. The method is applied for biological, food, and environmental samples such as airborne particulates which are collected on membrane filter. In this paper, the recovery for 25 elements in low temperature plasma ashing method was investigated by activation analysis. The samples used in this experiments were prepared as follows. 100μl of 1000 ppm standard solution for each element was dropped on membrane filter or cellulose filter. Two mg of Mg or Fe as coexisting material was added thereto subsequently. In addition, samples were also prepared by adding 100μl of 1 M NH4Cl or 1M KCl solution to the above samples. Then, all samples were dried with an infra-red lamp in a dust-free box. A pair of the same sample was prepared. One of them was ashed and the other one was used, without ashing, for reference in activation analysis. The neutron irradiation was made for 1 min, 10 min or 1 h using the pneumatic tube system in Research Reactor Institute Kyoto University at a thermal neutron flux of 2.3 × 1013 n cm-2 s-1. Radioactivity measurements were made with a 30 cm3 coaxial Ge(Li) detector coupled to a ND-1024 channel pulse-height analyzer. The recoveries of As(III), As(V), Cd, Se(IV) and Se(VI), were found to be 55% to 94% in the presence of Mg(NO3)2 or FeCl3, whereas those of the other elements except for Hg, Br, and I, were found to be more than 95% under the same conditions. In the case of coexistence of NH4Cl, the loss of As(V), Cd, Cr, Fe, and Sb was slightly increased.

収録刊行物

  • 分析化学

    分析化学 27 (10), 611-615, 1978

    公益社団法人 日本分析化学会

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