Behavior of Technetium and Iodine in a Hanford Sand and Associated Subsoil:Influence of Soil Aging on Uptake by Cheatgrass and Tumbleweed.

摘要

The comparative availability to plants of exp 99 TcO sub 4-and exp 125 I exp -in amended Rupert soil and associated subsoil was determined for soils aged after amendment for periods of 1, 10, 30,and 100days prior to planting. Concentration ratios for cheatgrass (Bromus tectorum) grown on Rupert soil a subsoil amended with exp 99 TcO sub 4-ranged from 185to 91and 466to 309,respectively;values for tumbleweed (Salsola Kali) ranged from 148to 82and 881to 173when grown on Rupert soil and subsoil,respectively. Concentration ratios for both cheatgrass and tumbleweed grown on Rupert soil amended with exp 125 I exp -ranged from 0.95to 0.25;values for cheatgrass and tumbleweed grown on subsoil ranged from 3.5to 1.3and 13to 5.8,respectively. Analyses of concentration ratios,shoot concentrations,and percentage of spike absorbed indicate a reduction in plant availability of both exp 99Tc and exp 125 I over the 100-day soil-aging period. This may result from immobilization of exp 99 TcO sub 4-and anion exchange reactions for exp 125 I exp - . (ERA citation 04:039605)