植物指標による気中フッ化物汚染の環境評価〔フッ化物による環境汚染に関する生物学的研究-2-〕

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In this experiment, leaves of gladiolus and mandarin orange were used as the plant indicators for air pollution by fluoride. In the field polluted by atmospheric fluoride, the fluoride accumulations of these plant leaves were associated with the gaseous fluoride concentrations. Relatioship between accumulation of fluoride in plant leaves (Y) and distance from the fluoride-emitting source (X) was associated with the equation of log Y=-aX+b (a, b: constant factors) proposed in this paper. The particulate fluoride (0.5 to 11 μgF/m3 per day) was collected for these five years and consisted mainly of particle size of 1_??_2μ. From these experiments, it was found that the monitoring of particulate fluoride in the air is necessary for the control of air pollution by fluoride. In addition to the monitoring of atmospheric fluoride by using physicochemical determinations, the biological effects of plants and animals were demonstrated to be necessary for the monitoring and control of atmospheric fluoride from this experiment.
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