激光剥蚀-电感耦合等离子体质谱法测定纯金中18种杂质元素

Determination of 18 impurity elements in pure gold by laser denudation-inductively coupled plasma-mass spectrometry

摘要: 采用激光剥蚀-电感耦合等离子体质谱法测定纯金中Ag、As、Bi、Cd、Co、Cr、Cu、Fe、Ir、Mg、Mn、Ni、Pb、Pd、Pt、Rh、Te、Zn等18种杂质元素。以系列金标样绘制标准曲线，并优化了仪器最佳工作参数。在激光能量为60 %、剥蚀孔径为110 μm、扫描速率为50 μm/s、脉冲频率为10 Hz、载气流量为0.80 L/min的条件下，各元素标准曲线的线性系数为0.9650~0.9995，检出限为0.010~0.660 μg/g，测定结果(除Fe、Ni外)相对标准偏差为0.75 %~11.42 %。采用本方法测定纯金中杂质元素，结果与ICP-AES测定结果吻合。

Abstract: Laser denudation-inductively coupled plasma-mass spectrometry is used for determination of 18 the impurity elements such as Ag， As， Bi， Cd， Co， Cr， Cu， Fe， Ir， Mg， Mn， Ni， Pb， Pd， Pt， Rh， Te， Zn. Standard curve is mapped with gold standard samples and optimal working parameters are optimized. When the laser energy is 60 %， denudation bore diameter is 110 μm， scanning rate is 50 μm/s， impulse rate is 10 Hz and the carrier gas flow is 0.80 L/min， the linear coefficient of the standard curve of each element is 0.9650-0.9995， the detection limit of each element is 0.010-0.660 μg/g， the relative standard deviation (RSD) is 0.75 %-11.42 % (except for Fe， Ni). The results of impurity elements determination in pure gold with this method are consistent with ICP-AES.