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This article in JEQ

  1. Vol. 2 No. 2, p. 171-178
    Received: June 7, 1972



Chlorodioxins in Pesticides, Soils, and Plants

  1. C. S. Helling,
  2. A. R. Isensee,
  3. E. A. Woolson,
  4. P. D. J. Ensor,
  5. G. E. Jones,
  6. J. R. Plimmer and
  7. P. C. Kearney2



Chlorodioxins, such as 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD), are highly toxic impurities found in certain pesticides. A review is made of (i) the sources and toxicology of TCDD and its relationship to the herbicide 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), and (ii) pesticide analyses and soil-related environmental studies of TCDD conducted by the U. S. Department of Agriculture. TCDD was persistent and immobile in soils. The dioxin was not detected, however, 6 years after abnormally high applications of 2,4,5-T to Lakeland sand. TCDD was not photodegraded on soil and only slightly, in aqueous suspension. Plants grown in soil containing 0.06 ppm TCDD had no detectable quantity (⩽ 1 ppb) at maturity. It was not translocated when applied to leaves, but wash-off or volatilization occurred. TCDD was undetected (< 50 ppb) in 19 bald eagle (Haliaeetus leucocephalus) carcasses.

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