微量硼素の光電比色定量法

概要

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The spectroscopic and volumetric methods are widely employed for the analyses of trace quantities of boron. Of the volumetric analyses, Chapin's method and its improved ones are most useful. But it should not be disregarded the effect of carbonic acid in these methods. As the removal of the effect of carbonic acid is considerably difficult, these methods are suitable only for the macro crder of boron and not for trace quantities of boron. Therefore, the author tried the colorimetric method for the trace quantities of boron in ground water, plants, rocks and metals etc. and obtained satisfactory results by use of the following procedure: Boron in sample is distilled with methyl alcohol in the quartz apparatus and the resultant ester develops red colour with carmine in high concentration of sulfuric acid. The transmittancy of this solution is compared with the standard colour by photoelectric colorimeter. This red colour of the solution obeys the Lambert-Beer's law in the range of boron content 08 γB/cc. NO-3, F- and Cu2+ interfere the colour development, while NO-2, Cl-, PO3-4, NH+4, Ca2+, Mg2+, Fe3+ and Na+ do not interfere. Some experimental details are discussed.
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