Dieldrin uptake from a contaminated Haplustox by glasshouse-grown plants

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Dieldrin uptake by carrots (Daucus carota), corn (Zea mays), lucerne (Medicago satira), lupins (Lupinus augustifolius), ryegrass (Lolium rigidurn), subclover (Trifolium subterraneum) and wheat (Triticum aestivum) grown in pots containing 4 kg soil contaminated with dieldrin (2.2 mg kg^<-1>) was determined. Plants were grown for 3 months in a glasshouse and were then analysed for dieldrin using a gas chromatographic technique. Roots of all plants contained in excess of 2 mg kg^<-1> dieldrin, while the tops of all plants except carrots contained less than 0.2 mg kg^<-1> dieldrin. In a similar experiment, the concentration of dieldrin in the roots of carrots grown in contaminated soil-brown coal mixtures decreased from 2.4 to 0.2 mg kg^<-1> as the percentage of coal in the growth medium increased from 0 to 20%. These data support the recommendation that it would be unwise to allow beef cattle to graze dieldrin-contaminated land planted with these species, as grazing animals ingest roots as well as tops of plants. Results also indicate that use of the contaminated soil for carrot production is not an option. Incorporation of brown coal into the surface soil would decrease the uptake of dieldrin by plants, but the high application rates required to achieve the desired decrease would be associated with prohibitively high costs.
社団法人日本土壌肥料学会の論文