Metal element detection technologies for seawater analysis are very important in the fields of marine scientific investigation and environmental monitoring. The current technologies cannot meet the requirements of detection capabilities, such as online, real-time, multi-element and highly sensitive while used in the above fields on-site. A newly developed sensor named online ultrasonic nebulizer assisted laser induced breakdown spectroscopy (OUN-LIBS) is introduced in this paper which is expected to be used for on-site seawater analysis. The core design idea of this sensor is to combine an online ultrasonic nebulizing auxiliary device with a traditional LIBS system to nebulize the liquid samples into aerosol for LIBS detection in order to realize a continuously, highly sensitive, stable and fast on-site detection. Based on this idea, a hardware system composed of an adapter module, a nebulizing module and an optical module and a software system with communication, control and display functions were designed. The laboratory experiments and marine field testing were carried out to assess the sensor. Under the status of continuous online detection, the LODs of the 6 target elements are lower than 1 ppm and the stability of spectral line intensity of Ca is lower than 0.38%. Besides the traditional calibration curve method, an online and on-site standard sample calibration method is adopted in the concentration quantitative analysis. The results of research show that the accuracy of online quantification analysis is very impressive even in the marine field testing.

用于海水分析的金属元素检测技术在海洋科学研究和环境监测领域中非常重要。当前的技术无法满足现场上述领域中使用的在线，实时，多元素和高灵敏度等检测能力的要求。本文介绍了一种新开发的传感器，称为在线超声雾化器辅助激光诱导击穿光谱法（OUN-LIBS），有望用于现场海水分析。该传感器的核心设计思想是将在线超声雾化辅助设备与传统的LIBS系统相结合，以将液体样品雾化成气溶胶以进行LIBS检测，从而实现连续，高度灵敏，稳定和快速的现场检测。基于这个想法，设计了由适配器模块，雾化模块和光学模块组成的硬件系统，以及具有通信，控制和显示功能的软件系统。进行了实验室实验和海洋现场测试以评估传感器。在连续在线检测的状态下，6种目标元素的LOD均低于1 ppm，Ca谱线强度的稳定性低于0.38％。在浓度定量分析中，除采用传统的校正曲线法外，还采用在线和现场标准样品的校正方法。研究结果表明，即使在海洋领域的测试中，在线定量分析的准确性也令人印象深刻。设计了控制和显示功能。进行了实验室实验和海洋现场测试以评估传感器。在连续在线检测的状态下，6种目标元素的LOD低于1 ppm，Ca谱线强度的稳定性低于0.38％。在浓度定量分析中，除采用传统的校正曲线法外，还采用在线和现场标准样品的校正方法。研究结果表明，即使在海洋现场测试中，在线定量分析的准确性也令人印象深刻。设计了控制和显示功能。进行了实验室实验和海洋现场测试以评估传感器。在连续在线检测的状态下，6种目标元素的LOD低于1 ppm，Ca谱线强度的稳定性低于0.38％。在浓度定量分析中，除采用传统的校正曲线法外，还采用在线和现场标准样品的校正方法。研究结果表明，即使在海洋领域的测试中，在线定量分析的准确性也令人印象深刻。6种目标元素的LOD均低于1 ppm，Ca的光谱线强度稳定性低于0.38％。在浓度定量分析中，除采用传统的校正曲线法外，还采用在线和现场标准样品的校正方法。研究结果表明，即使在海洋现场测试中，在线定量分析的准确性也令人印象深刻。6种目标元素的LOD均低于1 ppm，Ca的光谱线强度稳定性低于0.38％。在浓度定量分析中，除采用传统的校正曲线法外，还采用在线和现场标准样品的校正方法。研究结果表明，即使在海洋领域的测试中，在线定量分析的准确性也令人印象深刻。