Purification of Analytical Reagents by Sub-boiling Distillation and Isotope Dilution Surface Ionization Mass Spectrometry for Heavy Metals in Purified Materials

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  • サブボイリング蒸留による分析試薬の精製と精製物中の重金属の同位体希釈表面電離質量分析法

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Quartz stills for sub-boiling distillation were newly devised for the purification of analytical reagents such as acids, aqueous ammonia and organic solvents. Compared with those used previously, new stills of better quartz quality have a larger surface area for vaporization of liquid. Distillation rates were improved, for example, those of HNO3 being 0.287 and 0.993 kg⋅d-1 at 75 and 95°C, respectively. Without being exposed to the atmosphere, a purified reagent can be transferred to a neighboring still for second sub-boiling distillation. Purification degrees were examined by the use of isotope dilution surface ionization mass spectrometry which had been developed to measure each, 10-11g of Ag, Cd, Cu, Ni, Pb, Tl and Zn. Final concentrations of impurities in water, hydrochloric acid, nitric acid, perchloric acid, acetic acid, aqueous ammonia, chloroform and ethanol were at a level of 10-9 g⋅kg-1. As for heavy metals, the present method can give reagents purer than those ever reported.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1988 (5), 735-742, 1988-05-10

    The Chemical Society of Japan

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