Low-cost open-source H₂S monitoring system for coastal Sargassum decomposition

Hydrogen sulfide (H₂S) emissions associated with decaying sargassum mats in coastal regions represents both an environmental and occupational health risk, underscoring the need for H₂S sensors capable of storing information over time. Commercial detectors with such features involve a costly investment for coastal workers and field monitoring, highlighting the necessity for low-cost alternatives. In this study we address this issue through the assembling, calibrating and field testing of 15 custom-built H₂S sensors, while also generating open-source hardware and software material to ensure reproducibility. A calibration protocol was implemented under controlled laboratory conditions using an experimental chamber and a certified honeywell reference sensor. Each device underwent three independent regression trials and mean calibration parameters demonstrated strong linearity and duplicability. Field deployments were conducted in Puerto Morelos, Mexico where the sensors monitored both shoreline conditions and the exposure of workers engaged in handling and cleaning decomposed sargassum.沿海区域马尾藻藻床腐烂过程中产生的硫化氢（Hydrogen sulfide，H₂S）排放物兼具环境与职业健康风险，凸显了对具备长期数据存储能力的硫化氢传感器的迫切需求。具备此类功能的商用检测设备对于沿海作业人员与野外监测场景而言成本高昂，因此亟需开发低成本替代方案。本研究通过组装、校准与实地测试15台定制化硫化氢传感器来解决该问题，同时开源了硬件与软件资料以保障研究可复现。本研究在可控实验室环境下，利用实验舱与经过认证的霍尼韦尔（Honeywell）参考传感器搭建了校准规程。每台传感器均完成了三次独立回归试验，所得平均校准参数展现出优异的线性度与可重复性。本研究在墨西哥莫雷洛斯港开展了实地部署，传感器同时监测了海岸环境状况，以及从事腐烂马尾藻清理与处理作业的工人的职业暴露情况。