Martine C. Duff, Elizabeth A. Pettitt and Holly VerMeulen
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引用次数: 0
Abstract
Plant, soil, water, and other media from various locations at the Savannah River Site were measured for total tritium (T) content and T speciation to characterize T in these areas, as well as investigate its uptake behavior and the transport of T species in these media. This characterization included the isolation and measurement of T in tritiated water (HTO), and (when possible) exchangeable organic bound T (E-OBT) and non-exchangeable organic bound T (NE-OBT). Two areas of interest were investigated: (1) a holding pond with T-contaminated water and (2) open basins or streams with low to background levels of T. Water in the holding pond is used to irrigate forest plots in the local area as a T remediation approach. This study compares the analytical data for water, soil/sediment, plants, and lichens from these locations. The results indicate that the behavior of T in plants from these areas can be a function of one or more of the following: seasonal precipitation, the plant's primary route of access to the T-contamination (such as water uptake through the root vs. shoot), plant physical location (relative to T-contaminated water sources), plant rooting depth, pond water level, and plant height above the ground. Total T concentrations were lowest in the un-irrigated forest plants, followed by irrigated forest plants, shallow rooting plants near the pond, deep rooting plants further from the pond, and then water-saturated plants. The OBT:HTO and NE-OBT:E-OBT ratios were always greater for plants from irrigated forest plots compared to those from the holding pond.
对来自萨凡纳河遗址不同地点的植物、土壤、水和其他介质中的总氚 (T) 含量和氚的种类进行了测量,以确定这些地区氚的特征,并研究其吸收行为和氚种类在这些介质中的迁移。特征描述包括分离和测量氚化水(HTO)中的氚,以及(在可能的情况下)可交换的有机结合氚(E-OBT)和不可交换的有机结合氚(NE-OBT)。对两个感兴趣的领域进行了调查:1) 含有 T 污染水的蓄水池;2) T 含量低至背景水平的开放盆地或溪流。蓄水池中的水被用来灌溉当地的林地,作为一种 T 修复方法。本研究比较了这些地点的水、土壤/沉积物、植物和地衣的分析数据。结果表明,这些地区的植物体内 T 的行为可能受以下一个或多个因素的影响:季节性降水、植物接触 T 污染物的主要途径(如通过根部吸收水分与通过芽部吸收水分)、植物的物理位置(相对于 T 污染水源)、植物的扎根深度、池塘水位和植物离地面的高度。未灌溉森林植物的总 T 浓度最低,其次是灌溉森林植物、池塘附近的浅根植物、离池塘较远的深根植物,然后是水饱和植物。灌溉林地植物的 OBT:HTO 和 NE-OBT:E-OBT 比率总是高于蓄水池植物。
期刊介绍:
Environmental Science: Processes & Impacts publishes high quality papers in all areas of the environmental chemical sciences, including chemistry of the air, water, soil and sediment. We welcome studies on the environmental fate and effects of anthropogenic and naturally occurring contaminants, both chemical and microbiological, as well as related natural element cycling processes.