高能无干扰的K线同步龙X射线光显微镜,用于超蓄积器工厂中的稀土元素
Antony van der Ent1,2,3, Dennis Brueckner4, Kathryn M Spiers4
1Université de Lorraine, INRAE, LSE, F-54000 Nancy, France.
Metallomics : integrated biometal science
|August 17, 2023
概括
基于同步光子的微X射线光分析 (μXRF) 现在可以使用高能K线激发绘制稀土元素 (REEs),克服植物组织中的干扰问题. 这种方法虽然较慢,但可以在复杂样本中进行REE断层扫描和分析.
科学领域:
- 分析化学 分析化学
- 生物地质化学生物地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 基于同步光子的微型X射线光分析 (μXRF) 是一种敏感的,非破坏性的元素映射技术.
- 精确地绘制稀土元素 (REEs) 是具有挑战性的,因为重叠的X射线发射线,特别是与常见的过渡元素.
- 使用L-shell激发的现有方法与光谱干扰作斗争,限制了复杂矩阵中的REE分析.
研究的目的:
- 为了评估高能K线激发在超积聚植物组织中REE映射的有效性.
- 用μXRF进行REE分析,比较K线激发与传统L激发.
- 评估K线激发X射线光学 (XRF) 断层扫描和挑战性样本分析的潜力.
主要方法:
- 在光线线P06 (PETRA III, DESY) 使用基于同步子的μXRF,聚焦44keV的入射光束.
- 采用复合折射镜头 (CRL) 光学用于光束聚焦和超厚的漂移探测器用于高能X射线检测.
- 在高蓄积植物组织中,使用K线和L激发进行了Y,La,Ce,Pr和Nd的元素映射.
主要成果:
- 在使用高能K线激发而没有光谱干扰的情况下,在超积电厂成功地绘制了REE (Y,La-Nd).
- 由于流量和检测效率较低,K线激发的效率较低,比L线激发慢约10倍.
- K线激发显著降低了自我吸收效应,使毫米尺寸的冷水化植物样本能够进行XRF断层扫描.
结论:
- 高能K线激发是植物组织μXRF分析中无干扰REE映射的可行方法.
- 这种技术对于具有高度干扰元素的样本特别有利,例如土壤样本.
- 使用K线激发进行XRF断层扫描的能力为研究生物和环境样本中的REE分布开辟了新的途径.
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