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James Burdon Michael H.B. Hayes Malcolm E. Pick 《Journal of environmental science and health. Part. B》2013,48(1):37-51
Abstract Charge distributions in 1, 1'‐ethylene‐2, 2'‐bipyridylium (diquat), 1,1'‐dimethyl‐4,4'‐bipyridylium (paraquat) and 1‐methylpyridinium organocations were calculated by a Complete Neglect of Differential Overlap semi‐empirical quantum mechanical procedure. The data show that the positive charges in the organocations are distributed around the molecules and are greatest in the positions ortho and para to the heterocyclic nitrogen atoms. Earlier interpretations of the mechanisms of adsorption of paraquat and diquat by soils and clays assumed that the charges were located in the heterocyclic nitrogen atoms. Here some consideration is given to the influence of the charge delocalizations on the processes of adsorption by montmorillonite and vermiculite clay preparations. 相似文献
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Currently, in the Federal Republic of Germany residual amounts of pesticide residues are not separately collected but usually disposed in sanitary landfills with household waste. A concept is presented to prevent this way of waste disposal. It recommends specific incineration methods or, in special cases, the underground disposal. Strategies for collecting systems are also discussed. 相似文献
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B. Kanitscheider H. Mayer-Kaupp E. Lamla H. Pick D. Smidt K. Beyermann G. Höhler D. Osteroth D. Reinen C. K. Jørgensen W. Werner I. Ugi T. Tsuruta H. Batzer A. Wacker K. Mühlethaler V. Neuhoff D. Pörschke K. Goerttler G. Czihak J. Lom G. Birukow J. Nicolai L. Jaenicke H. Knüfermann C. H. Eugster 《Die Naturwissenschaften》1975,62(2):100-104
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