【摘要】 利用激光诱导击穿光谱技术,使样品在大气常压环境下被击穿形成等离子体,探测等离子体发射信号。选择混合样品所含的基体元素硅作为内标元素,分别根据碳谱线峰值强度、分析线和内标线峰值强度比建立不同的定标曲线。对两种定标曲线的拟合度、测量重复性以及定量分析结果准确度进行了研究。研究结果表明:强度比定标法在一定程度上可以提高定标曲线的拟合度和测量重复性,减小强度比定标法定量分析结果的误差,提高测量准确度。更多还原

【Abstract】 Samples were excited by pulse laser and plasma was formed at atmospheric pressure.The technique of laser induced breakdown spectroscopy(LIBS) was applied to analyzing the carbon content in the samples.The matrix element Si was selected as internal standard,calibration curves were drawn respectively using the peak intensity of carbon line and the intensity ratio of carbon line and silica line.The fitting degree of two different calibration curves,signal reproducibility and the accuracy of calibrated values were analyzed.The results of the analysis show that the intensity ratio method seems more adequate than the peak intensity method for establishing the calibration cures.更多还原