3種幼植物の成長およびタリウム含量に及ぼす水耕液中タリウム濃度の影響

概要

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The effects of Tl (I) on the growth, and the Tl content of the seedlings of komatsuna (Brassica campestris L.), soybean (Glycine max L.) and corn (Zea mays L.) were examined in water culture solutions containing 0, 1, 5 and 10 μmol L^<-1> Tl (I) for 15 d. The results were as follows: 1) The degree of inhibition on the growth of shoot and root was in the order of komatsuna <soybean < corn. The growth rates of komatsuna, soybean and corn in 1 μmol L^<-1> plots were 84, 42 and 13% of the control, respectively. 2) Much Tl was absorbed by the seedlings and a large amount of Tl was translocated from the roots to the shoots. About 85% of the Tl absorbed by komatsuna was contained in the shoot (edible part). In soybean and corn, about 50-70% of the absorbed Tl was also contained in the shoots. 3) Tl concentrations in shoots which inhibited 50% of the growth were 600-700 mg kg^<-1> DW in komatsuna and several tens of milligrams kg^<-1> DW in both soybean and corn. 4) The allowable concentration for soil is 1 mg kg^<-1> ADW (air-dry weight), and that for foods is 0.1 mg kg^<-1> FW in Germany. Acceptable daily intake (ADI) has been proposed as 37, 15.4 or 14 μg d^<-1>. Since these figures are very low, it is important not to increase the concentration of Tl in soils and foods.
社団法人日本土壌肥料学会の論文
1999-08-05