为了研究电烙铁工作时焊接含铅锡线产生的烟雾对局域空气的污染, 设计了一套基于激光诱导击穿光谱技术(LIBS)的实验系统, 对电烙铁焊接含铅锡线的烟雾进行在线分析, 在烟雾的光谱中发现了重金属元素铅的特征谱线。使用元素内标法对铅元素进行定量分析, 通过分析铅元素的等离子体温度与电子数密度的相关特性, 验证了实验所得光谱的有效性。结果表明, 通过拟合曲线获得铅元素的检出限为19.35×10-5; 对比传统化学的化验方法, 基于激光诱导击穿光谱的电烙铁焊接锡线的场景检测实验系统和方法具有在线、原位、快速的优越性。该研究对解决电烙铁工作时室内空气的污染, 减轻对使用者健康造成的危害是有帮助的。

In order to explain the local air pollution caused by the smoke produced by soldering leaded tin wire with electric soldering iron, an experimental system based on laser induced breakdown spectroscopy was designed to analyze the smoke produced by soldering leaded tin wire with electric soldering iron, and the characteristic spectral line of heavy metal lead was found in the smoke spectrum. Lead was quantitatively analyzed by internal standard method, and the detection limit of lead was 19.35×10-5 by fitting the curve. By analyzing the correlation between the plasma temperature and electron number density of lead, the validity of the experimental spectrum was verified. The results show that the experimental system and method of scene detection of electric soldering tin wire based on laser-induced breakdown spectrum have advantages of on-line, in-situ and fast when compared with the traditional chemical test method.