Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator

• Novel continuous gas-liquid separator enables rapid multi-component dissolved gas analysis in seawater via Raman spectroscopy, reducing detection time from 30 min to ~200 s. • Achieved limit of detection (LOD) of ~14 ml·L−1 for N2, demonstrating high sensitivity for dissolved gas monitoring. • Extraction efficiency and decay time follow the order CO2 > O2 > N2, providing insights into gas separation dynamics. • System validation shows great potential for studying spatiotemporal distribution of dissolved gases, crucial for global carbon cycle research.