Ion exchange separation of chromium from natural water matrix for stable isotope mass spectrometric analysis
Ion exchange separation of chromium from natural water matrix for stable isotope mass spectrometric analysis
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DOI：
10.1016/s0009-2541(00)00189-3
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发表时间：
2000-07
期刊：
影响因子：
3.9
通讯作者：
J. W. Ball;R. Bassett
中科院分区：
文献类型：
--
作者：
J. W. Ball;R. Bassett
建立了一种固体源热电离质谱（TIMS）分离天然水体中溶解态Cr与基体元素并测定其稳定同位素比值的方法。该分离方法利用Cr的氧化形式作为含氧阴离子的存在，使用阴离子交换色谱将其与干扰阳离子分离，并利用Cr的还原形式作为带正电荷的离子将其与干扰阴离子如硫酸根分离。分离的样品的后续处理消除了用于施加到固体源丝的残留有机材料。可以使用硅胶-硼酸技术测量美国国家标准与技术研究所标准参考材料979的53 Cr/52 Cr比率，其中50次重复的平均53 Cr/52 Cr比率的磨料-细丝标准偏差为0.00005或更小。
A method has been developed for separating the Cr dissolved in natural water from matrix elements and determination of its stable isotope ratios using solid-source thermal-ionization mass spectrometry (TIMS). The separation method takes advantage of the existence of the oxidized form of Cr as an oxyanion to separate it from interfering cations using anion-exchange chromatography, and of the reduced form of Cr as a positively charged ion to separate it from interfering anions such as sulfate. Subsequent processing of the separated sample eliminates residual organic material for application to a solid source filament. Ratios for53Cr/52Cr for National Institute of Standards and Technology Standard Reference Material 979 can be measured using the silica gel-boric acid technique with a filament-to-filament standard deviation in the mean53Cr/52Cr ratio for 50 replicates of 0.00005 or less.