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TECHNICAL REPORT
Heavy Metals in the Environment

Plant Uptake of Cadmium-109 and Zinc-65 at Different Temperature and Organic Matter Levels

Agricultural Univ. of Norway, Department of Soil and Water Sciences, PB 5028, 1432 Aas, Norway

Corresponding author (asgeir.almas{at}ijvf.nlh.no)

Received for publication September 30, 1999. The uptake of ¹⁰⁹Cd and ⁶⁵Zn and their stable isotopes by ryegrass (Lolium multiflorum Lam.), grown on two different soil types, was investigated in climatically controlled growth chambers at 9 and 21°C. The soils were treated with 0 and 4% organic matter (pig [Sus scrofa] manure) and spiked with ¹⁰⁹Cd and ⁶⁵Zn before sowing. The organic matter addition resulted in increased uptake of the ¹⁰⁹Cd, Cd, and Zn by ryegrass, but the uptake of ⁶⁵Zn was decreased. The latter effect was ascribed to isotopic dilution of ⁶⁵Zn as the amount of stable Zn in the plant tissues increased with the organic matter addition. The effect of temperature was more pronounced than that of organic matter addition, and the uptake of both ¹⁰⁹Cd and ⁶⁵Zn and their stable isotopes was higher in ryegrass grown at 21°C than that grown at 9°C. Results from fractionation and speciation analysis of soil cadmium and zinc were correlated with plant uptake, and there was a good consistency between observed plant uptake and the physico–chemical forms of cadmium and zinc in soil and soil solution presumed to be plant available.

Abbreviations: ASV, anodic stripping voltammetry • DM, dry matter