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This article in JEQ

  1. Vol. 25 No. 1, p. 92-96
     
    Received: Feb 15, 1995
    Published: Jan, 1996


    * Corresponding author(s): zqlin@nrs.mcgill.ca
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doi:10.2134/jeq1996.00472425002500010012x

Uptake and Translocation Studies in Balsam Fir Seedlings with 54Mn and 65Zn Radioisotopes Applied to Soil Surfaces

  1. Z.-Q. Lin *,
  2. N. N. Barthakur,
  3. P. H. Schuepp and
  4. G. G. Kennedy
  1. Nuclear Engineering Inst., École Polytechnique, P.O. Box 6079, Montreal, Que., H3C 3A7 Canada.

Abstract

Abstract

Pathways of heavy metal deposits in balsam fir [Abies balsamea (L) Mill.] seedlings were investigated by simultaneously applying 54Mn and 65Zn radioisotopes on soil surfaces. Downward movement of 54Mn and 65Zn in soils was documented to the 14 to 16 cm depth 70 d after application. One-year-old needles and 3-yr-old twigs concentrated more radioisotopes than older needles and younger twigs, respectively, with the sample specific activity (kBq kg−1) of 54Mn 5 to 10 times higher than that of 65Zn. The activity in seedlings on the 70th d of the experiment was 5.2% of the total remaining activity for 54Mn (6290 kBq) and 2.6 % for 65Zn (6031 kBq). The distribution of 54Mn in the seedling was 31% in roots, 31% in twigs, 26% in stems, and 12% in needles, while roots retained 86% of 65Zn. No appreciable migration of elements from internal tissues to epicuticular wax layers was found when shoots were washed in chloroform. The maximum leaching ratio was below 0.5 and 1.0% for 54Mn and 65Zn, respectively, when shoots were washed in simulated acid rain for 5 min.

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