地质样品铁同位素自动固相萃取系统研究

Study on Automatic Solid Phase Extraction System to Separate Iron Isotope from Geological Samples

研发了一种自动固相萃取系统,用于分离地质样品中铁同位素。系统有4个并行通道,可以一次处理4个样品。对于这4个样品,一次处理过程仅需24 min。选用AG1-X8阴离子交换树脂对花岗岩样品(GBW07103)中的铁进行萃取。在萃取过程中,当盐酸浓度大于6 mol/L时,铁形成络阴离子并被吸附在AG1-X8阴离子交换树脂上,其余阳离子被洗脱出来。用浓度为8 mol/L的HNO 3和H 2O洗脱铁,铁的洗脱体积为4 mL,铁可以被定量回收,回收率达到96.0%~107%。消除了测试过程中的基体影响,提高了样品处理效率,减少了人为污染风险,是一个多元化样品处理工具。

An automatic solid phase extraction system was developed to separate iron from geological samples.The system has four parallel channels and can process four samples at a time.One extraction procedure will take 24 minutes for 4 samples.The iron was separated from granite(GBW07103)with AG1-X8 anion resin.Iron can be converted into anionic complex in 6 mol/L hydrochloric acid and adsorbed on AG1-X8 anion resin.While iron can be eluted with 8 mol/L nitric acid and H 2O.The recovery of iron was 96.0%-107%.This automatic solid phase extraction system eliminates the influence of matrix,improves sample processing efficiency,reduces the risk of human contamination,and is a diversified sample processing tool.