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New method for the determination of saturation concentration of Dichlorvos

Eine neue Methode zur Bestimmung der Sättigungskonzentration von Dichlorvos

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Summary

Saturation concenrtation of DDVP at room temperature (28°) has been determined by a colorimetric method. The saturation concentration at 28° are 9.39 and 8.55 mg/l for AR and technical grade samples respectively. The method consists of coupling DDVP vapours in gas-tight tubes with alkaline resorcinol at a water bath of 60–65°, when a yellow chromophore with an absorption maximum at 490 nm is formed. The linear relationship between the concentration of DDVP and absorbance at 490 nm holds good in the range of 1 to 20μg DDVP. The method has been checked with a gas Chromatographie method for accuracy. These values are also verified by a physical method based on Dalton's Law of partial pressures in a gaseous mixture.

Zusammenfassung

Die Sättigungskonzentration von Dichlorvos (DDVP) bei Raumtemperatur (28° C) wurde kolorimetrisch bestimmt. Sie beträgt bei 28° C für das analytisch reine Präparat 9,39 mg/l bzw. für das technisch reine Präparat 8,55 mg/l. Das Verfahren besteht in der Kupplung von DDVP-Dampf in gasdichten Röhrchen mit alkalischem Resorcin bei Wasserbadtemperatur (60–65°), wobei eine gelbe Verbindung mit einem Absorptionsmaximum bei 490 nm gebildet wird. Die Absorption bei dieser Wellenlänge ist zwischen 1 und 20μg DDVP linear. Das Verfahren wurde gaschromatographisch überprüft. Außerdem wurden die Ergebnisse auch physikalisch mittels des Gesetzes von Dalton für Partialdrucke in gasförmigen Gemischen verifiziert.

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Authors and Affiliations

  1. Infestation Control and Pesticides Discipline, Central Food Technological Research Institute, Mysore, India

    J. R. Rangaswamy & M. Muthu

Authors
  1. J. R. Rangaswamy
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  2. M. Muthu
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Rangaswamy, J.R., Muthu, M. New method for the determination of saturation concentration of Dichlorvos. Mikrochim Acta 84, 433–443 (1984). https://doi.org/10.1007/BF01197157

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  • DOI: https://doi.org/10.1007/BF01197157

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