Thermal behaviour of organochlorine pesticides in the presence of alkaline substances
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Abstract
Selected organochlorine pesticides, namely lindane, PCNB,p,p′-DDT andp,p′-methoxychlor, and some related compounds (p,p′-DDE andp,p′-DMDE) were heated in the presence of powdered KOH, Na2CO3, CaO and CaCO3 in order to check whether degradation of the compounds is feasible in moderate conditions and temperatures. Thermal analyses, as well as investigations concerning the search for the reaction products revealed that processes occurring at atmospheric pressure are either simple volatilization of organic molecules, observed upon heating of mixtures containing lindane, PCNB,p,p′-DDE andp,p′-DMDE, or volatilization accompanied with decomposition towards HCl andp,p′-DDE andp,p′-DMDE, noted when heating mixtures ofp,p′-DDT andp,p′-methoxychlor with alkaline substances, respectively. Complementary theoretical calculations enabled insight into the mechanism of HCl elimination fromp,p′-DDT andp,p′-methoxychlor.
Keywords
decomposition in the presence of alkalies organochlorine pesticides theory of HCl elimination thermal analysesZusammenfassung
Einzelne Organochlorpestizide, namentlich Lindan, PCNB,p,p′-DDT undp,p′-Methoxychlor sowie einige verwandte Verbindungen (p,p′-DDE undp,′-DMDE) wurden in der Gegenwart von zerpulvertem KOH, Na2CO3, CaO und CaCO3 erhitzt, um zu prüfen, ob der Abbau der Verbindungen durch eine Änderung von Bedingungen und Temperaturen möglich ist. Thermoanalyse als auch Untersuchungen bezüglich der Suche nach den Reaktionsprodukten zeigten, daß es sich bei den bei atmosphärischem Druck ablaufenden Vorgängen entweder eine einfache Verdampfung organischer Moleküle handelt, wie sie beim Erhitzen der Gemische mit Gehalt an Lindan, PCNB,p,p′-DDE undp,p′-DMDE beobachtet wird, oder aber um eine Verdampfung, begleitet von Zersetzung zu HCl undp,p′-DDE oderp,p′-DMDE, wie sie beim Erhitzen von Gemischen ausp,p′-DDT undp,p′-Methoxychlor mit alkalischen Substanzen beobachtet wird. Zusätzliche theoretische Berechnungen ermöglichten einen Einblick in den Mechanismus der Abspaltung von HCl ausp,p′-DDT undp,p′-Methoxychlor.
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