Okazaki Takuya, Yokose Miku, Ishii Yudai, Ueda Akira, Kuramitz Hideki, Watanabe Tomoaki
Department of Applied Chemistry, School of Science and Technology, Meiji University, 1-1-1Tama-ku, HigashimitaKawasaki, Kanagawa, 214-8571, Japan.
Department of Environmental Biology and Chemistry, Faculty of Science, Academic Assembly, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan.
Anal Sci. 2024 Dec;40(12):2167-2173. doi: 10.1007/s44211-024-00653-0. Epub 2024 Sep 4.
A reflective surface plasmon resonance (SPR) sensor was evaluated for real-time monitoring of scale deposition. The sensor consists of an optical fiber, only 5 mm at the gold-coated tip of the sensing area. The effect of silica growth on the sensor response was evaluated using a NaSiO solution. The sensitivity of the sensor to silica was 1.6 ± 0.3 nm per one immersion in the solution of 1000 mg/L (as SiO) at 85 °C and subsequnt air drying, as indicated by the SPR peak shift. The amount of silica deposited on the gold surface was measured by the quartz crystal microbalance method, and the SPR sensitivity of 0.089 nm/ng to silica mass was obtained. The detection limit (3σ) of the SPR sensor was 17 ng, corresponding to a thickness of 2.5 nm for amorphous silica. The SPR sensor was tested in geothermal brine sampled at the Sumikawa Geothermal Power Plant, where a clear SPR shift was observed, suggesting the effectiveness of the SPR sensor for scale monitoring.
对一种反射型表面等离子体共振（SPR）传感器进行了评估，用于实时监测水垢沉积。该传感器由一根光纤组成，传感区域的镀金尖端仅5毫米。使用硅酸钠溶液评估了二氧化硅生长对传感器响应的影响。如SPR峰位移所示，在85°C下将传感器每次浸入1000mg/L（以SiO计）的溶液中并随后进行空气干燥时，传感器对二氧化硅的灵敏度为1.6±0.3nm。通过石英晶体微天平法测量了沉积在金表面的二氧化硅量，得到了对二氧化硅质量的SPR灵敏度为0.089nm/ng。SPR传感器的检测限（3σ）为17ng，对应于非晶硅二氧化硅2.5nm的厚度。在相川地热发电厂采集的地热卤水中对SPR传感器进行了测试，观察到明显的SPR位移，表明SPR传感器用于水垢监测的有效性。
