Abstract
Paraquat, applied to a sandy loam soil at the field application rate (0.56 to 2.24 kg ha−1) was found to reside in the top 1 cm of the soil. The compound was adsorbed by soil fractions such as organic matter, non-expanding and expanding-lattice clays. The process of adsorption was not significantly affected by soil pH but was influenced by porosity, moisture content, residence time and adsorption capacity of the soil. The strong binding of paraquat to soil constituents reduced the mobility of the herbicide by leaching but the compound was displaced from binding sites by low concentrations of cations, such as NH4 +, K+, Na+, and Ca2+. The desorption process was dependent upon the adsorption capacity of the soil and the kind and concentration of desorbing cation. A rapid and sensitive procedure for quantitative recovery of low levels of paraquat in small soil samples (1 to 5 g) was developed. Paraquat was released from soil using a hot-plate and acid-digestion procedure and was recovered by employing a modification of the Imperial Chemical Industries' ion-exchange method. The herbicide was incubated under a variety of environmental conditions but was not found to be degraded chemically or microbiologically in soil during incubation periods as long as 16 months at 25°C.
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Smith, E.A., Mayfield, C.I. Paraquat: Determination, degradation, and mobility in soil. Water Air Soil Pollut 9, 439–452 (1978). https://doi.org/10.1007/BF00213540
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DOI: https://doi.org/10.1007/BF00213540