基于自由定标激光诱导击穿光谱的黄铜定量研究

Quantitative study of brass based on calibration-free laser-induced breakdown spectroscopy

为了实现黄铜样品中铜、锌元素质量分数的快速定量检测,采用自由定标激光诱导击穿光谱技术(CF-LIBS)对3种黄铜样品开展了相关研究。分别选择铜元素的6条、锌元素的4条特征谱线为分析对象,在单次脉冲和10次脉冲平均光谱采集方式下,对比分析铜和锌元素特征谱线的相对标准偏差(RSD)。结果表明,与单次脉冲相比,10次脉冲平均使铜和锌的光谱RSD平均值分别下降8.8%和12.3%;采用CF-LIBS对3种黄铜样品中铜、锌元素质量分数进行定量计算,铜、锌元素的温度与等离子体温度平均值之间的相对误差分别为5.2%、0.9%和7.1%;3种样品中铜元素质量分数的相对误差分别为5.6%、0.5%和1.6%,锌元素质量分数的相对误差分别为9.2%、2.0%和13.3%。CF-LIBS有望为黄铜元素质量分数的快速及精准检测提供方法支持,为进一步实现研制合金样品元素质量分数便携式检测设备提供数据和技术支持。

In order to realize the rapid quantitative detection of copper and zinc in brass samples,three brass samples were studied by calibration-free laser-induced breakdown spectroscopy(CF-LIBS).Six characteristic spectral lines of copper and four characteristic spectral lines of zinc were selected as the analysis objects.Under the spectrum acquisition modes of a single pulse and an average of 10 pulses,the relative standard deviation(RSD)of characteristic spectral lines of copper and zinc were comparatively analyzed.The results show that under the condition of an average of 10 pulses,the average RSD of copper and zinc is decreased by 8.8%and 12.3%,respectively,compared with the single pulse.The mass fraction of copper and zinc in three brass samples are quantitatively calculated by CF-LIBS,the relative errors between the temperature of copper and zinc and the average plasma temperature are 5.2%,0.9%,and 7.1%,respectively.The relative errors in copper mass fraction in the three samples are 5.6%,0.5%and,1.6%,respectively;The relative errors in zinc mass fraction are 9.2%,2.0%,and 13.3%,respectively.CF-LIBS is expected to provide method support for the rapid and accurate detection of element mass fraction in brass and provide data and technical support for the further development of portable detection equipment for the element mass fraction of alloy samples.