The sensitive quantitative analysis of trace heavy metallic elements (Cd, Mn, Cr, and Cu) in aqueous solutions was achieved successfully through the combination of filter paper enrichment with laser-induced breakdown spectroscopy. Filter paper was enriched with 0.4 mL aqueous solutions to form a homogeneous sample layer on the surface of the metallic target. Considering the limits of detection, the values deduced with calibration curves already exhibited the high performance of the proposed method at several hundred or 10 μg/L (Cd 0.165, Mn 0.035, Cr 0.012, and Cu 0.078 mg/L), lower than or comparable to those using other similar methods. The LIBS results agreed reasonably well with those from ICP-MS for real samples. All results showed that our method was suitable and accurate for rapid on-site detection of trace metals in aqueous solutions. This indicates that filter paper enrichment combined with laser-induced breakdown spectroscopy is a feasible approach to wastewater quality monitoring.

通过滤纸富集和激光诱导击穿光谱技术的结合，成功地实现了对痕量重金属元素（镉，锰，铬和铜）的灵敏定量分析。滤纸富含0.4 mL水溶液，在金属靶材的表面形成均匀的样品层。考虑到检测限，用校准曲线推导出的值已经显示出所提出方法的高性能，在数百或10μg/ L（Cd 0.165，Mn 0.035，Cr 0.012和Cu 0.078 mg / L）以下或以下。与使用其他类似方法的结果相当。LIBS结果与ICP-MS的真实样品相当吻合。所有结果表明我们的方法适用于快速现场检测水溶液中的痕量金属。