快速消解ICP-MS法测定土壤中痕量镉及其干扰消除

Determination of Trace Amounts of Cadmium in Soil by ICP-MS with Rapid Digestion and Its Interference Elimination

建立了快速消解-电感耦合等离子体质谱法(ICP-MS)测定土壤中痕量镉的分析方法,选择^(114)Cd谱线扣除^(118)Sn的光谱干扰,用^(103)Rh做内标进行检测。该法检出限为0.002 mg/kg,精密度为2.9%～4.6%,加标回收率为89.7%～106.6%,方法准确可靠、高效环保,适用于大批量土壤样品的分析。

A method to determine concentrations of trace amounts of cadmium in soil by inductively coupled plasma mass spectrometry(ICP-MS)with rapid digestion was developed.The 114Cd spectral lines were selected to eliminate line interference of 118Sn,and the 103Rh was used as internal standard.The detection limit was 0.002 mg/kg,the relative standard deviation were 2.9%-4.6%,and the recoveries rate were 89.7%-106.6%.The detection method was accurate,reliable,efficient and environmental friendly,which was suitable for the analysis of large batches of soil samples.