Study on liquid electrode plasma and its application to high functional integrated analysis devices

研究了高灵敏液体电极等离子体原子发射光谱(LEP-AES)。考察了不同积累时间、不同芯片材料、不同进样流量条件下的检出限。结果表明，采用石英芯片结合流动进样进行长时间积累对改善LOD是非常有效的。作者认为，这是因为每个等离子体脉冲后残留的气泡被样品流从狭窄的通道中去除，从而产生了高重复性的等离子体，从而实现了高累积效应。最后，根据校正曲线计算出的LOD为0。镉为00052μmg/L，0。019.在最佳条件下，铅的含量为0μmg/L。对于Cd，达到了亚ppb级的LOD。

High-sensitive liquid-electrode plasma atomic emission spectrometry(LEP-AES) are studied. T the limits of detection(LOD) were investigated in various condition of accumulation time, material of the chip, and the sample flow. It was found that the long accumulation using quartz chip with sample flow was very effective to improve LOD. Authors suggested that this was because bubbles remaining after each plasma pulse were removed from the narrow channel by sample flow, resulting high reproducible plasma generation, to enable high accumulation effect. Finally, LOD were calculated from calibration curve, to be 0. 00052μmg/L for Cd and 0. 019. 0μmg/L for Pb at optimized condition. Sub ppb level LOD was achieved for Cd.