生物体中の痕跡元素の分析法に関する研究-11-

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In the determination of copper, zinc, and manganese in plant ashes by the polarographic method, coprecipitation phenomena of the iron and aluminum in the plant ashes have been utilized by precipitating the hydroxides to collect the cations. Distilled ammonia was added to the acidified sample solution drop by drop to a pH of 7.4. The solution was kept at pH 7.4 and allowed to stand over night. The precipitate was centrifuged and dissolved in dilute HCl. Cation exchange resin was used to concentrate the cations and avoid the interference of anions as described in the previous paper. The Fe3+ was separated by extraction with ether and the final solution was diluted to a definite volume. A definite portion was taken out and a polarogram was obtained in tartaric acid-NH4Cl-NH4OH medium. The extracted Fe3+ was returned to the water layer and the solution was made up to a definite volume. A definite portion was taken out and a polarogram was obtained in citric acid-NaOH medium. The ashes of spinach, Houttuynia cordata, and some grasses were analysed by this method and the contents of iron, copper, zinc, and manganese were determined.
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