在低盐度和高盐度的水样中比较-226的测量技术和吸
Sarah E Donaher1, Jiusi Wang2, Nicole E Martinez3
1Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC, 29625, USA; Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
概括
在海洋环境中精确测量 (Ra) 是至关重要的. 诱导合等离子体质谱法 (ICP-MS) 与稀释是高盐度样品的首选方法,因为矩阵效应会影响其他技术.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 人类活动可能会改变海洋生态系统中的 (Ra) 分布,需要对潜在暴露进行监测.
- 现有的Ra测量技术往往侧重于低盐度,为高盐度的河口和海洋环境留下了一个空白.
- 快速可靠的Ra测量对于时间敏感的环境监测和应急响应至关重要.
研究的目的:
- 用三种分析方法评估测量Ra在各种盐度样本中的检测极限,成本和易用性.
- 为了在现实应用环境中描述226Ra与海洋基板的分离过程.
- 在具有挑战性的高盐度矩阵中确定最适合用于精确Ra量化的方法.
主要方法:
- 液晶闪计数 (LSC),高纯度 (HPGe) 马光谱和感应联等离子体质谱 (ICP-MS) 的比较.
- 对低盐度和高盐度的水样进行方法性能评估.
- 226Ra 分离到相关的海洋基板的特性.
主要成果:
- 对于低盐度样品,HPGe提供了最低的检测极限,但成本高昂,并且对高盐度样品的恢复不佳.
- 液体闪计数 (LSC) 对高盐度样品的检测极限低于ICP-MS,但随着时间的推移,标准下降.
- 诱导合血质谱法 (ICP-MS) 与样品稀释证明对高盐度样品最可靠,尽管没有稀释的初始检测极限较高.
结论:
- 诱导合等离子体质谱法 (ICP-MS) 与适当的样本稀释是测量高盐度海洋样本中的的推方法.
- 观察到其他方法的局限性,包括成本,回收问题和标准稳定性,突出了高盐度分析的挑战.
- 进一步研究Ra分区和改进分析技术对于有效的海洋环境监测至关重要.
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