Dual-channel Time-series Optimization Control Sampling Strategy and Its Application in Online Gas Chromatography-Mass Spectrometry Analysis of Water Quality
Instrument development and application|更新时间:2026-10-14
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Dual-channel Time-series Optimization Control Sampling Strategy and Its Application in Online Gas Chromatography-Mass Spectrometry Analysis of Water Quality
Journal of Instrumental AnalysisVol. 45, Issue 10, Pages: 2234-2243(2026)
QIU Wen-wei,SONG Xing-wei,WU Man-man,LI Kai-xuan,GAO Wei.Dual-channel Time-series Optimization Control Sampling Strategy and Its Application in Online Gas Chromatography-Mass Spectrometry Analysis of Water Quality[J].Journal of Instrumental Analysis,2026,45(10):2234-2243.
QIU Wen-wei,SONG Xing-wei,WU Man-man,LI Kai-xuan,GAO Wei.Dual-channel Time-series Optimization Control Sampling Strategy and Its Application in Online Gas Chromatography-Mass Spectrometry Analysis of Water Quality[J].Journal of Instrumental Analysis,2026,45(10):2234-2243.DOI: 10.12452/j.fxcsxb.26050804.
Dual-channel Time-series Optimization Control Sampling Strategy and Its Application in Online Gas Chromatography-Mass Spectrometry Analysis of Water Quality
To address the challenge of inefficient parallel analysis of volatile organic compounds(VOCs) and semi-volatile organic compounds(SVOCs) in water,this study proposes a dual-channel time-series optimization control strategy for an online water quality gas chromatography-mass spectrometry(GC-MS) analysis system. Based on this strategy,a dual-channel online sampling device was constructed and its application evaluated. Under the control of this strategy,the idle time between analyses in the online system was reduced from 44.0 min to 1.3 min,which shortened the single monitoring cycle by 28% and simultaneously prevented volatilization losses of target analytes caused by prolonged retention times. Methodological validation was performed by coupling the online sampling device with the online analysis system to analyze 60 VOCs and SVOCs. Both compound classes exhibited excellent linearity with
r
²≥0.995 9 within the ranges of 0.1-20 μg/L and 5-100 ng/L,respectively. The limits of detection for 56 VOCs ranged 0.04-0.26 μg/L,while those for four SVOCs reached 0.12-0.25 ng/L. Spiked recoveries for both compound classes ranged in 88.8%-114%. The improved operational efficiency resulting from time-series optimization also enabled more frequent monitoring by the system. During an 8-day continuous monitoring campaign in a river network,the monitoring system,using the proposed strategy,successfully captured transient concentration fluctuations of a pollutant with a peak value of 130 ng/L. The dual-channel time-series optimization control strategy proposed in this work resolves the issue of excessive processing time associated with traditional serial pretreatment and combined analysis modes,increases the throughput of online GC-MS analysis,and provides valuable technical support for high-frequency tracking and continuous early warning of s
udden composite pollution in complex water bodies.
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