• Applied Biological Chemistry
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• v.1
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• pp.26-33
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• 1960

Organic mercurial fungicides, for seed treatments and dust formulations, has been increasingly used by farmers. Evaluation of the purity of organic mercurial fungicides has been performed by precipitation method at this laboratory. There are several methods for the an alyses of organic mercuric formulation, among which are (1) Precipitation met hod, (2) Volatilization method, (3) Volumetric method, and (4) Dithizon method. These methods, however, show some deffects in specificity (differentiation of organic form) and quantitativity. Polarography applied for the estimation of phenyl mercuric acetate was found to be simple, rapid and accurate. Tile fundamental method of polarography arid accuracy of analysis are discussed statistically and a satisfactory results was obtained.

• Journal of the Korean Chemical Society
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• v.13 no.1
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• pp.45-48
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• 1969

Spuren von Blei und Zink werden aus großen Wassermengen mit benzolischer Dithizonlosung in einer Pulsationskolonne durch kontinuirliche Flussig-Elussig-Extraktion angereichert. Nach der Extraktion wird das Benzoly-peroxid oxydiert und die Spurenelemente durch verdunnte Salzsaure zuruckextrahiert. Die angereicherten Metalle werden durch Einleiten von Schwefelwasserstoff aus der Losung bei pH 8 unter Zusatz von Aluminium Trager ausgefallt. Die Niederschlage der Metallsufide werden durch Membranfilter filtriert, mit Gelatine fixiert und ihre Absolutmengen durch Rontgenfluoreszenzanalyse bestimmt. Blei wird bei einer Konzentration von 2.5 bis 100 p.p.b. mit einer relativen Standardabwechung von 9.0% und Zink bei einer Konzentration von 2.5-100 p.p.b. mit einer relativen Standardabwechung von 10.3% gemesssen.

• Journal of the Korean Chemical Society
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• v.53 no.2
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• pp.144-151
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• 2009

An optode for cadmium ion determination has been designed by immobilization of dithizone on triacetylcellose membrane. When the optode membrane is introduced into a real samples containing cadmium, there is a color change from green to red, making it possible to use the change in absorbance at 611 nm as the analytical signal. The sensor could be used in the range of 0.3-3 ${\mu}g\;ml^{-1}$ (2.67-26.67 ${\mu}M$) of $Cd^{2+}$ ions with a limit of detection of 0.025 ${\mu}g\;ml^{-1}$ (25 ng $ml^{-1}$). The response time of optode is within 15 min depending on the concentration of $Cd^{2+}$ ions. It can be easily and completely regenerated by dilute EDTA solution. The effect of different possible interfering species has been examined and was shown the optode has a good selectivity. The results obtained for the determination of cadmium ion in polluted soil and water samples using the proposed optode was found to be comparable with the well-established atomic absorption method.