【摘要】 采用 ICP- MS法对冰芯样品中超痕量 Cd的直接测定进行了研究。确定了直接测定浓度为 pg/m L 级的 Cd的最佳仪器参数、载气流速、进样速度等与灵敏度之间的关系以及浓度和扫描参数对分析精度的影响。本方法对浓度 5～2 0 0 pg/m L Cd的分析 ,RSD<1 0 % ,回收率在 88%～ 1 0 5%之间 ,检测限为0 .1 5pg/m L更多还原

【Abstract】 A new method for determination of trace Cd in ice core samples by ICP MS was developed. The analysis parameters for measuring Cd was optimized. The relationship of sensitivity with flow rate of sample gas and auxilliary gas were studied. The influence of concentrations and scan parameters on analysis precision were also studied. The precision(RSD) is less 10%, corresponding to the concentration range of 5～200 pg/mL. The recovery from standard solutions is in the range of 88%～105%. The detection limit is 0.15 pg/mL.更多还原