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Issue 12, 2014
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Products and kinetics of the heterogeneous reaction of particulate ametryn with NO3 radicals

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Abstract

As a renowned s-triazine herbicide, ametryn is worldwide emitted into the atmosphere in both gaseous and particulate phases via spray drifts from treatments and post application emissions, but its chemical degradation in the atmosphere has not been well characterized. In this study, the heterogeneous kinetics of particulate ametryn with NO3 radicals were investigated with a mixed-phase relative rate method. A vacuum ultraviolet photoionization aerosol time-of-flight mass spectrometer (VUV-ATOFMS) and an atmospheric gas analysis mass spectrometer were synchronously used to online monitor the decays of particulate ametryn and gas-phase isoprene. The reactive uptake coefficient of NO3 radicals on ametryn particles was calculated to be 2.9 × 10−2, according to the measured ametryn loss ratio and the average NO3 concentration. The effective rate constant for the heterogeneous reaction of particulate ametryn with NO3 radicals measured under experimental conditions was 8.4 × 10−13 cm3 molecule−1 s−1. In addition, atraton, ametryn sulfoxide and ametryn sulfone were identified as the reaction products by gas-chromatography-mass spectrometry (GC-MS) analysis. The experimental results might shed light on the chemical behavior of atmospheric ametryn at night-time.

Graphical abstract: Products and kinetics of the heterogeneous reaction of particulate ametryn with NO3 radicals

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Publication details

The article was received on 25 Jun 2014, accepted on 01 Sep 2014 and first published on 01 Sep 2014


Article type: Paper
DOI: 10.1039/C4EM00352G
Environ. Sci.: Processes Impacts, 2014,16, 2686-2691

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    Products and kinetics of the heterogeneous reaction of particulate ametryn with NO3 radicals

    C. Liu, J. Shu, B. Yang and P. Zhang, Environ. Sci.: Processes Impacts, 2014, 16, 2686
    DOI: 10.1039/C4EM00352G

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