CID-ICP-AES测定碱土金属的分析性能

Analytical Performance of CID-ICP-AES for Alkaline-Earth Elements

电荷注入检测器 (CID)配合中阶梯光栅分光系统组成的光谱仪有一些新的特性 ,研究了用CID ICP光谱仪测定碱土金属的分析性能。实验表明 ,碱土 (Be,Mg ,Ca ,Sr,Ba)元素有良好的检出限 :Be ,Sr,Ba 0 0 0 0 2mg·L- 1 ,Mg 0 0 0 0 1mg·L- 1 ,Ca 0 0 0 0 0 3mg·L- 1 ,线性动态范围 10 4 ～ 10 5,自吸收系数均 <1,Ca,Mg的自吸收系数低至 0 7～ 0 8。研究了光度精度与浓度和谱线强度的关系 ,试液浓度在 1mg·L- 1 以上时 ,测定有良好的精密度。

The plasma spectrometer composed of Charge Injection Device(CID) and echell grating has excellent analytical performance. In the present paper, analytical performance of CIalCP-AES was studied for alkaline-earth elements. The results showed that the detection limits were 0.000 03 mg(.)L(-1) for Ca, 0.000 2 mg(.)L(-1) for Be, Sr and Ba, and 0.000 1 mg(.)L(-1) for Mg. The self-absorption coefficient was less than 1 for all alkaline earth elements and 0.7-0.8 for Ca and Mg. The linear range of the determination was 104 10(5). The photometric precision was RSD = 1% when concentration was less than 1 mg(.)L(-1).