深海海域蕴藏着丰富的矿产、能源和生物资源, 具有潜在的巨大经济价值。深海溶解态矿物质是海底热液活动及演化的重要示踪剂。以深海海水中的硫离子为研究对象, 以迷你型高功率发光二极管(LED)作为激发光源,采用全光纤传输方式的设计理念, 结合基于朗伯-比尔定律的全光谱检测方法和化学显色法, 对深海离子矿物质的检测方法开展研究。在数据处理上, 采用自行建立的自适应性Savitzky-Golay滤波算法使光谱信噪比提高3~7倍。结果表明：在1 s时间分辨率和20 mm的有效光程下, 系统的检测灵敏度可达0.1 μmol/L以下, 且在0~32 μmol/L浓度范围内具有良好的线性响应特性(相关度R2>0.99)。

The deep-sea region has great economic potential due to its rich mineral, energy, and biological resources. Dissolved deep-sea minerals are important markers that reflect the activity and evolution of seafloor hydrothermal fluids. Herein, a novel in situ measurement method is proposed to estimate deep-sea sulfur ion concentration. The all-optical fiber transmission mode is adopted as a design concept, with a high-power mini light-emitting diode (LED) used as the excitation light source. The chemical display method, which is based on the Lambert-Beer law, is combined with the full spectrum detection method to measure the concentrations of deep-sea ionic minerals. The self-established adaptive Savitzky-Golay filtering algorithm is employed to achieve a threefold to sevenfold improvement in the spectral signal-to-noise ratio for data processing. The results reveal that the proposed system can achieve a detection sensitivity below 0.1 μmol/L under the conditions of 1 s time resolution and a 20 mm effective optical path. Furthermore, a good linear response characteristic ［relativity (R2)>0.99］ is obtained in the 0-32 μmol/L concentration range.