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A Triple‐Stack Column Procedure for Rapid Separation of Cu and Zn from Geological Samples
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-04-06 , DOI: 10.1111/ggr.12323
Heye Freymuth 1 , Callum D. J. Reekie 1 , Helen M. Williams 1
Affiliation  

We present a new procedure for the separation and purification of Cu and Zn from geological samples. Our procedure employed a single pass, triple‐stack column set‐up. The first column, filled with TRU resin (TrisKem International), quantitatively removed Fe and Ti from sample matrices. A second column, filled with pre‐filter resin (TrisKem International), removed organic compounds. Finally, a third column, filled with anion exchange resin (AG1‐X8, 200–400 mesh, Bio‐Rad), was used to separate Cu and Zn from the remaining matrix. Our procedure required about 50% less acid volume than previously reported methods for Cu and Zn separation, thereby minimising analytical blanks and column running times. Copper and Zn stable isotope ratios were determined by a Thermo Neptune Plus MC‐ICP‐MS using Zn and Cu external normalisation, respectively, in addition to sample‐standard bracketing to correct for instrumental mass bias. We explore the inter‐calibration of Cu and Zn isotope fractionation coefficients during analysis by measuring mixed Cu–Zn solutions with enhanced mass bias variation generated by varying sample gas flow rates. Our results demonstrate that this procedure is useful when variation in instrumental mass bias throughout analytical sequences is insufficient to inter‐calibrate Cu and Zn fractionation coefficients.

中文翻译:

快速从地质样品中分离铜和锌的三重柱色谱法

我们提出了从地质样品中分离和纯化铜和锌的新程序。我们的程序采用了单程,三重色谱柱设置。第一列装有TRU树脂(TrisKem International),从样品基质中定量去除了Fe和Ti。第二列装有预过滤树脂(TrisKem International),除去了有机化合物。最后,第三根柱子填充了阴离子交换树脂(AG1-X8,200-400目,Bio-Rad),用于从剩余基质中分离铜和锌。我们的程序所需的酸量比以前报道的用于铜和锌分离的方法少约50%,从而最大限度地减少了分析空白和色谱柱的运行时间。铜和锌的稳定同位素比分别通过Thermo Neptune Plus MC-ICP-MS使用Zn和Cu外部归一化来确定,除了用于校正仪器质量偏差的样品标准括号外。我们通过测量混合的Cu-Zn溶液,通过改变样气流速产生的质量偏差变化,探索了铜和锌同位素分馏系数的相互校准。我们的结果表明,当整个分析序列中仪器质量偏差的变化不足以相互校准Cu和Zn分离系数时,此程序非常有用。
更新日期:2020-04-06
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