Separation of Sr-90 and Ca2+ in Enviromental Samples

环境样品中 Sr-90 和 Ca2 的分离

• 批准号: 7110888
• 负责人: ALAN J CISAR
• 金额: $ 50.66万
• 依托单位: LYNNTECH, INC.
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7110888
• 关键词: antimony; calcium ion; chemical synthesis; environmental toxicology; ground water; ion exchange chromatography; radioactive waste; radionuclides; silicon; strontium; technology /technique development; tin; water pollution; water sampling /testing; water treatment; antimony; calcium ion; chemical synthesis; environmental toxicology; ground water; ion exchange chromatography; radioactive waste; radionuclides; silicon; strontium; technology /technique development; tin; water pollution; water sampling /testing; water treatment

DESCRIPTION (provided by applicant): The goal of this SBIR project is the development of an improved inorganic ion exchanger with an extremely high selectivity for Sr2+. This ion exchanger will improve the extraction of 90Sr from groundwater at the sites around the US and the world that have become contaminated through mishap or poor handling of nuclear materials, some of which are in contact with aquifers and bodies of water used as drinking water supplies. 90Sr is a ?-emitting isotope with an extremely low maximum safe exposure limit. (The drinking water limit is 8 pCi/L.) Development of this material will make a significant contribution to safer drinking water. In Phase I of this project we demonstrated that the substitution of SnlV and SilV for part of the SbV in the pyrochlore-structured antimonic acid (Sb2O5 4 H2O) increased both the compound's affinity for Sr+2 and its selectivity for strontium over calcium by a factor of nearly four. (A strong preference for Sr+2 is important, because the strontium is always found with a large excess of calcium.) The resulting material has a capacity for 90Sr over 200 times that of the clinoptilotile currently used to collect strontium in pump-and-treat systems. In Phase II we will refine the composition of the exchanger and scale-up the synthesis. The material will be evaluated in complete detail for use as a column material for extracting 90Sr from ground water out of the ground or as the active component in a permeable reactive barrier to block the motion of 90Sr in ground water in the ground. In plain language: Adding tin or silicon to antimonic acid greatly improves its ability to remove strontium from aqueous solutions in the presence of the very similar calcium. This makes it an excellent choice for removing radioactive strontium-90 from ground water either at the surface, or while still in the ground.

描述（由申请人提供）：该SBIR项目的目标是开发改进的无机离子交换器，对SR2+的选择性极高。该离子交换器将改善美国和世界各地的90SR从地下水中提取，这些地下水已通过不幸或核材料的处理不良而污染，其中一些与含水层和用作饮用水供应的水体接触。 90SR是一种？发射同位素，其最大安全曝光极限。 （饮用水限制为8 pci/l。）这种材料的开发将为更安全的饮用水做出重大贡献。在该项目的第一阶段中，我们证明了SNLV和SILV代替pyrochlore结构的抗极酸（SB2O5 4 H2O）在SBV中的一部分SBV替代，这两种化合物对SR+2的亲和力及其对钙优于钙的选择性均提高了近四个因子。 （对SR+2的强烈偏爱很重要，因为始终发现锶的钙过多。）生成的材料的能力超过200倍以上的200倍，目前用于收集泵和治疗系统中的斜角。在第二阶段，我们将完善交换器的组成并扩大合成。该材料将全面评估，以用作从地下水中从地下水中提取90SR或作为可渗透反应性屏障中的活性成分的柱材料，以阻止地下水中90SR的运动。用简单的语言：在非常相似的钙存在下，将锡或硅添加到抗极酸中可以大大提高其从水溶液中去除锶的能力。这使其成为从地面上或仍在地面上的地下水中去除放射性锶-90的绝佳选择。