红外与激光工程, 2019, 48 (3): 0322003, 网络出版: 2019-04-06  

便携式SERS传感器的近岸海水中PAHs检测

Detection of PAHs in coastal sea water using portable SERS sensor
作者单位
中国海洋大学 信息科学与工程学院 光学光电子实验室, 山东 青岛 266100
摘要
为实现海水中痕量多环芳烃 (Polycyclic Aromatic Hydrocarbons, PAHs)的现场快速、高灵敏度检测, 研制了便携式高灵敏度表面增强拉曼散射(Surface-enhanced Raman Scattering, SERS)传感器, 将倒置的望远镜结构应用于外置光路模块, 使光路的效率提高到商业化光纤拉曼探头的3.7倍, 光路全长约120 mm, 系统尺寸为350 mm×300 mm×180 mm, 质量约15 kg, 功耗约30 W, 满足现场探测便携式的要求。利用该传感器对青岛岸边海水中PAHs进行现场检测, 发现了萘、菲、■、苯并(k)荧蒽、苯并(b)荧蒽、苯并(a)芘等的信号, 检测结果得到气相色谱(Gas Chromatography, GC)的证实, 且检测到GC法难以检测到的易挥发性物质萘。对青岛近海石老人海域和麦岛海域的现场船载检测发现: 石老人海域随离岸距离的增加, PAHs种类和含量分布稳定; 麦岛海域PAHs随离岸距离的增加, 种类和含量均明显减少。结果表明, 自主研发的SERS传感器具有便携、快速、高灵敏度的特点, 可为近岸海域有机污染物PAHs的监测提供依据。
Abstract
To realise the on-site, rapid and high sensitivity detection of trace polycyclic aromatic hydrocarbons (PAHs) in coastal water, a portable high-sensitive surface-enhanced Raman scattering sensor was developed, and a high-efficiency outside optical path of spectrometer assembled with inverted telescope structure was applied, which optimized the collection efficiency around 3.7 times better than a commercial optical probe, and the optical path was about 120 mm long. A high sensitive surface-enhanced Raman scattering (SERS) sensor was also established with 350 mm×300 mm×180 mm, 15 kg quality and 30 W power consumption, which can satisfy the portable requirements in on-site detection. PAHs in coastal sea water were detected on-site using this sensor, and signals of naphthalene, acenaphthylene, phenanthrene, chrysene, benzo (k) fluoranthene, benzo (b) fluoranthene, benzo (a) pyrene and so on were recognized. Meanwhile, the results were confirmed by the gas chromatography (GC). Besides, volatile naphthalene was discriminated by SERS but wasn′t recognized by GC. SERS detection of Shilaoren and Maidao area of Qingdao coastal area showed that in Shilaoren coastal area, with the increase of offshore distance, the contents and concentration of PAHs were similar, but in Maidao coastal area, the contents and concentration of PAHs reduced significantly. The results indicate that SERS sensor is portable, convenient and with high sensitivity, and can provide data for PAHs monitoring in the high pollution area.

严霞, 贾文杰, 史晓凤, 张旭, 张艺超, 马君. 便携式SERS传感器的近岸海水中PAHs检测[J]. 红外与激光工程, 2019, 48(3): 0322003. Yan Xia, Jia Wenjie, Shi Xiaofeng, Zhang Xu, Zhang Yichao, Ma Jun. Detection of PAHs in coastal sea water using portable SERS sensor[J]. Infrared and Laser Engineering, 2019, 48(3): 0322003.

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