Abstract

Wallace A. Effect of soil pH and chelating agent (DTPA) on uptake by and distribution of 241 Am in plant parts of bush beans . Radiation Botany 12 , 433–435, 1972.—Bush bean ( Phaseolus vulgaris L. var. Improved Tendergreen) plants were grown with and without the chelating agent diethylenetriaminepentaacetate (DTPA) in Yolo loam soil which had been amended to give a range of soil pH values. A level of 1·68 μcuries 241 Am had been uniformly mixed with each 500 g quantity of soil. Highest amounts of 241 Am and highest leaf-stem ratios for the 241 Am were found in plant parts at soil pH around 7·7 with the DTPA. The results are interpreted as chelated 241 Am not only being available to the plants especially at pH 7·7 but also the 241 Am being transported through the plants as the metal chelate.

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