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首页> 外文期刊>Environmental Science & Technology: ES&T >Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System
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Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System

机译：Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System

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摘要

Sensitive detection methods for nitrite (NO2~) and nitrate (NO3~) ions are essential to understand the nitrogen cycle and for environmental protection and public health.Herein, we report a detection method that combines ion-chromatographic separation of NO2~ and NO3~, on-line photochemical conversion of these ions to peroxynitrite (ONOO~) by irradiation with a 222 nm excimer lamp, and chemiluminescence from the reaction between luminol and ONOO-.The detection limits for NO2~ and NO3~ were 0.01 and 0.03 μM, respectively, with linear ranges of 0.010—2.0 and 0.10—3.0 μM, respectively, at an injection volume of 1 μL.The results obtained by the proposed method for seawater analysis corresponded with those of a reference method (AutoAnalyzer based on the Griess reaction).As luminol chemiluminescence can measure ONOO" at picomolar concentrations, our method is expected to be able to detect NO2~ and NO3~ at picomolar concentrations owing to the high conversion ratio to ONOO (>60%), assuming that contamination and background chemiluminescence issues can be resolved.This method has the potential to emerge as an innovative technology for NO2~ and NO3~ detection in various samples.

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