Xiao Ming-Fa, Chen Shi-Zhong, Lu Deng-Bo, Zhan Xi-Lin
Key Laboratory, Wuhan Polytechnic University, Wuhan 430023, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Feb;28(2):444-6.
A novel method for the determination of Au by inductively coupled plasma mass spectrometry (ICP-MS) is described. Au can be separated and preconcentrated with a micro-column packed with carbon nanofibers as an adsorption material. The adsorption and elution behaviors of Au3+ on carbon nanofibers were systematically investigated under dynamic conditions. The experimental results showed that the studied ions can be adsorbed quantitatively at pH 2.0, and the analytes adsorbed on the column can be eluted with H2NCSNH2-HCl solution at pH 1.0. Under the optimum conditions, the detection limits for Au is 0.15 ng x mL(-1), and the relative standard deviation (RSD) is 8.5% (n = 6). The proposed method has been applied to the determination of trace Au in geological standard material with satisfactory results.
描述了一种通过电感耦合等离子体质谱法（ICP-MS）测定金的新方法。金可以用填充有碳纳米纤维作为吸附材料的微柱进行分离和预富集。在动态条件下系统研究了Au3+在碳纳米纤维上的吸附和洗脱行为。实验结果表明，所研究的离子在pH 2.0时可定量吸附，柱上吸附的分析物可用pH 1.0的H2NCSNH2-HCl溶液洗脱。在最佳条件下，金的检测限为0.15 ng x mL(-1)，相对标准偏差（RSD）为8.5%（n = 6）。该方法已应用于地质标准物质中痕量金的测定，结果令人满意。
