论文部分内容阅读
以激光诱导击穿光谱技术实时检测水中的重金属镉元素为研究目的,对不同浓度的含镉水溶液进行激光诱导击穿光谱试验。确定在以361.05 nm为镉元素特征分析谱线时,较佳采集延迟时间为1 680 ns,较佳的激光能量值为110 m J。采用线性拟合的方法对镉元素进行定量分析,拟合曲线的线性相关系数为0.995 38,两验证样品的相对误差分别为9.21%、8.50%。研究表明激光诱导击穿光谱技术对水中镉元素进行实时、在线检测是可行的,但检测灵敏度还有待进一步提高。
Laser-induced breakdown spectroscopy for real-time detection of cadmium in water for the purpose of research, different concentrations of cadmium-containing aqueous solution induced laser-induced breakdown spectroscopy. It is confirmed that the best acquisition delay time is 1 680 ns when the spectral line is analyzed with the characteristic of cadmium at 361.05 nm, and the preferred laser energy is 110 mJ. The linearity of cadmium was quantitatively analyzed by linear fitting method. The linear correlation coefficient of the fitted curve was 0.99538. The relative errors of the two validated samples were 9.21% and 8.50% respectively. The results show that laser-induced breakdown spectroscopy is feasible to detect cadmium in water in real time and on-line, but the detection sensitivity needs to be further improved.