Petitgirard Sylvain, Daniel Isabelle, Dabin Yves, Cardon Hervé, Tucoulou Rémi, Susini Jean
Université de Lyon, F-69622 Lyon, France.
Rev Sci Instrum. 2009 Mar;80(3):033906. doi: 10.1063/1.3100202.
We present a new diamond anvil cell (DAC), hereafter called the fluoX DAC, dedicated for x-ray fluorescence (XRF) analysis of trace elements in fluids under high pressure and high temperature to 10 GPa and 1273 K at least. This new setup has allowed measurement of Rb, Sr, Y, Zr, with concentrations of 50 ppm to 5.6 GPa and 1273 K. The characteristics of the fluoX DAC consist in an optimized shielding and collection geometry in order to reduce the background level in XRF spectrum. Consequently, minimum detection limits of 0.3 ppm were calculated for the abovementioned elements in this new setup. This new DAC setup coupled to the hard x-rays focusing beamline ID22 (ESRF, France) offers the possibility to analyze in situ at high pressure and high temperature, ppm level concentrations of heavy elements, rare earth elements, and first transition metals, which are of prime importance in geochemical processes. The fluoX DAC is also suitable to x-ray diffraction over the same high pressure-temperature range.
我们展示了一种新型金刚石对顶砧（DAC），以下称为fluoX DAC，它专门用于对高压高温下流体中的微量元素进行X射线荧光（XRF）分析，至少可达到10吉帕斯卡的压力和1273开尔文的温度。这种新装置能够测量浓度为50 ppm的铷、锶、钇、锆，压力可达5.6吉帕斯卡，温度可达1273开尔文。fluoX DAC的特点在于优化的屏蔽和收集几何结构，以降低XRF光谱中的背景水平。因此，在此新装置中，上述元素的最低检测限计算为0.3 ppm。这种与硬X射线聚焦光束线ID22（法国欧洲同步辐射装置）耦合的新型DAC装置提供了在高压高温下原位分析重元素、稀土元素和第一过渡金属的ppm级浓度的可能性，这些元素在地球化学过程中至关重要。fluoX DAC在相同的高压 - 温度范围内也适用于X射线衍射分析。
