Abstract：The plasma spectrometer composed of Charge Injection Device(CID) and echell grating has excellent analytical performance. In the present paper, analytical performance of CID-ICP-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 104-105. The photometric precision was RSD＝1% when concentration was less than 1 mg·L-1.
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