Zur Frage von Chlorfenvinphos-und 2,2′,4′-Trichloracetophenon-Rückständen bei Gemüsekulturen und in gärtnerisch genutzten Erden.Teil 1

  • M. Häfner
Article
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To the question of chlorfenvinphos and 2,2′,4′-trichloracetophenone residues in vegetables and horticultural soils

Abstract

The present work illustrates the situation of chlorfenvinphos and supposed trichloroacetophenone residues in vegetables and horticultural soils. For that purpose, samples of radishes, cucumbers, cress and soils were analysed. The received results admit — in connection with residue results that are given in literature — the following statements and conclusions:
  1. 1.

    After applications of chlorfenvinphos containing plant protectives chlorfenvinphos residues can remain in soils for half a year or longer. However, chlorfenvinphos is completely metabolized within a defined period and thereafter it cannot be detected. Therefore, repeated applications of chlorfenvinphos containing plant protectives should not lead to a continued accumulation of chlorfenvinphos in soils.

     
  2. 2.

    Trichloroacetophenone, the hydrolysis product of chlorfenvinphos with boiling half concentrated sulfuric acid, could not be detected in any sample of soils investigated by us — even after 30 applications of the chlorfenvinphos containing plant protective Birlane Granulat at the same area during the last 10 years.

     
  3. 3.

    A proof for the purpose that chlorfenvinphos is metabolized in vegetables to trichloroacetophenone cannot be given. Also trichloroacetophenone residues in vegetables resulting from soil can be excluded. From this point of view, it seems not to be necessary to establish a tolerance for trichloroacetophenone.

     
  4. 4.

    After application of Birlane Granulat the German waiting-time for radishes is 30 days and the waiting-time for cucumbers is 60 days. These waiting-times seem to be practically as shown in this work.

     
  5. 5.

    When Birlane Granulat is applicated to a certain plant culture, not only this culture but following cultures of plants can be contaminated with chlorfenvinphos over a certain period. The results of experiments with cress as following plant culture give rise to the conclusion that cress can contain higher chlorfenvinphos residues as admitted within a period of three months and more after application of Birlane Granulat.

     

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Literaturverzeichnis

  1. 1.
    Gerät: Hewlett-Packard, Modell 5713 A mit Elektroneneinfangdetektor63Ni.-Geräteparameter: Säule 1∶6 Fuß 1/4 Glassäule mit 5% SE-30 auf HP Chromosorb G AW DMCS, 80 bis 100 mesh. Säule 2∶6 Fuß 1/4 Glassäule mit 2% OV-17 auf HP Chromosorb W AW DMCS, 100 bis 120 mesh. Vordurck: 4,5 bar. Trägergas: Argon/ Methan (9∶1). Trägergasstrom: Säule 1∶40 ml/min. Säule 2∶45 ml/min. Attenuation: 32. Einspritzblocktemperatur: 250°C. Detektortemperatur: 250°C. Säulentemperatur: Säule 1∶195°C. Säule 2∶210°C. Einspritzvolumen: 1 μl Benzol. Papiervorschub: 0,25 in/min.Google Scholar
  2. 2.
    Bei Radies und Rettich wurden in der Regel nur die Rübenkörper untersucht. Die Rückstandswerte für Radies und Rettich beziehen sich in dieser Arbeit nur auf die Rübenkörper.Google Scholar
  3. 3.
    In den entsprechenden Blindversuchen war bei allen Radies- und Rettichproben kein Chlorfenvinphos nachweisbar (Nachweisgrenze für Chlorfenvinphos unter den gewählten Bedingungen: 0,005 ppm).Google Scholar

Copyright information

© Verlag Paul Parey 1980

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  • M. Häfner

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