流动注射蒸气发生原子吸收光谱测定痕量铜

建立了流动注射蒸气发生原子吸收光谱测定铜的新方法。使含有微量邻菲咯啉的样品溶液与硼氢化钠溶液汇合并反应生成蒸气态物质。在Ar载气下随反应液进入气液分离器分离 ,并进入石英管原子化器在 1 0 0 0℃下检测。在 5 0 0 μL进样体积下 ,铜的检出限为 1 8μg·L- 1 ,相对标准偏差为 2 6%(n =1 1 ,c=1 0 0 μg·L- 1 )。采样频率为 1 4 4样·h- 1 。分析标准参考物质大米粉和头发样品中的铜 ,结果与标准值一致

Determination of Trace Amounts of Copper by Flow Injection Vapor Generation AAS

A method for the determination of copper by FI-VGAAS (flow injection vapor generation atomic absorption spectrometry) was developed. The sample solution containing trace amounts of o-phenanthroline and 0.1 mol.L-1 HNO3 was carried out by carrier of 0.1 mol.L-1 HNO3 and merged with sodium tetrahydroborate solution to produce the vapor species of copper, which got separation in gas-liquid separator and was detected in a quartz tube atomizer at 1000 degrees C. A detection limit of 1.8 micrograms.L-1 (3 sigma) of copper was obtained with a sampling frequency of 144/h using a sample volume of 500 microL. The precision RSD was 2.6% (n = 11) at the 100 micrograms.L-1 copper. The method was applied to the analysis of human hair and rice standard reference samples, the results were in good agreement with certified values.