利用中心波长为1064 nm的Nd∶YAG脉冲激光器作为激发光源，以高分辨率、宽光谱段的中阶梯光栅光谱仪和增强型电荷耦合器件为谱线分离与探测器件，在石墨富集的方式下测量并分析了水中铅元素的激光诱导击穿光谱特性。实验中以铅的405.78 nm特征谱线作为分析线，研究了水中铅元素的时间衰减特性，确定了最佳延迟测量时间为900 ns，门控测量宽度为1600 ns，通过对不同浓度的含铅样品进行测量，给出了铅元素的标定曲线，并计算得到铅元素质量浓度的检测限约为0.0665 mg/L。以碳为内标元素有效地消除光谱不稳定性对分析结果的影响，提高了被分析元素的检测限和稳定性。

The spectroscopy emission characteristics of trace heavy metal lead in water enriched with graphite is studied based on laser induced breakdown spectroscopy technique. With a 1064 nm wavelength NdYAG laser as excitation source, the echelle spectrometer and an intensified charge coupled device are used for spectral separation and high sensitive detection with high resolution and wide spectral range. The characteristic spectral line of 405.78 nm with detection delay time 900 ns and gate time 1600 ns is selected for lead in the experiment. The calibration curve of Pb is plotted based on the different concentration measurement results, and the limit of detection with 0.0665 mg/L is obtained for Pb in water. Carbon as the internal standard element effectively eliminates the spectral instability of the analytical results, and the detection limits and stability are improved.