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Portable and selective chloride ion detection in high-salinity water via a microwave sensor and synergistic precipitation-dielectric strategy
发布时间：2026-01-21
  • 发表刊物：
    Talanta
  • 关键字：
    Microwave sensors, Chloride detection, Portable detection, Specificity and sensitivity
  • 摘要：
    Accurate detection of chloride ions (Cl−) in water is of great significance for ensuring human health and environmental safety. This study reports a cost-efficient, portable, and flexible microwave sensing system for detecting Cl− in high-salinity water. This system employs a split ring resonator fabricated on a printed circuit board (PCB) substrate as the microwave sensor. The passivation layer covers the sensor to improve the sensitivity, prevent cross-contamination, and increase robustness. The integration of the sensor with a palm-sized LiteVNA for microwave signal acquisition facilitates portable Cl− detection. To avoid the influence of other impurity ions and achieve high specificity in Cl− detection, silver nitrate (AgNO3) is added into the sample during testing. The reaction between Cl− and AgNO3 induces changes in the microwave signal caused by variations in dielectric properties, which corresponds to the Cl− concentration. The detection is carried out over a Cl− concentration range of 0–40 g L−1 within the microwave frequency range of 0.5–3.5 GHz, whereas a characteristic peak appears between 0.9 and 1.2 GHz. The frequency shift before and after AgNO3 addition is proportional to the Cl− concentration and remains unaltered from various impurity ions. The optimized sensor design and AgNO3 amount facilitate the system to obtain high sensitivity, excellent specificity, and rapid detection with a response time of 10 s.
  • 第一作者：
    Xiao Liu
  • 通讯作者：
    Ning Qin,Pei Zhao,Yong Dong
  • 全部作者：
    Chonghui Yang,Xiangwen Xing,Guiqin Yang,Gang Ding,Qinglong Sun,Zhanlong Song
  • 论文类型：
    期刊论文
  • 论文编号：
    129434
  • 卷号：
    302
  • 影响因子：
    6.1
  • DOI码：
    10.1016/j.talanta.2026.129434
  • 是否译文：
    否
  • 发表时间：
    2026-01
  • 收录刊物：
    SCI
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