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Photochemical Generation of Methyl Chloride from Humic Aicd: Impacts of Precursor Concentration, Solution pH, Solution Salinity and Ferric Ion.


ABSTRACT: Methyl chloride (CH3Cl) is presently understood to arise from biotic and abiotic processes in marine systems. However, the production of CH3Cl via photochemical processes has not been well studied. Here, we reported the production of CH3Cl from humic acid (HA) in sunlit saline water and the effects of the concentration of HA, chloride ions, ferric ions and pH were investigated. HA in aqueous chloride solutions or natural seawater were irradiated under an artificial light, and the amounts of CH3Cl were determined using a purge-and-trap and gas chromatography-mass spectrometry. CH3Cl was generated upon irradiation and its amount increased with increasing irradiation time and the light intensity. The formation of CH3Cl increased with an increase of HA concentration ranging from 2 mg L-1 to 20 mg L-1 and chloride ion concentration ranging from 0.02 mol L-1 to 0.5 mol L-1. The photochemical production of CH3Cl was pH-dependent, with the highest amount of CH3Cl generating near neutral conditions. Additionally, the generation of CH3Cl was inhibited by ferric ions. Finally, natural coastal seawater was irradiated under artificial light and the concentration of CH3Cl rose significantly. Our results suggest that the photochemical process of HA may be a source of CH3Cl in the marine environment.

SUBMITTER: Liu H 

PROVIDER: S-EPMC7013589 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Photochemical Generation of Methyl Chloride from Humic Aicd: Impacts of Precursor Concentration, Solution pH, Solution Salinity and Ferric Ion.

Liu Hui H   Pu Yingying Y   Tong Tong T   Zhu Xiaomei X   Sun Bing B   Zhang Xiaoxing X  

International journal of environmental research and public health 20200113 2


Methyl chloride (CH<sub>3</sub>Cl) is presently understood to arise from biotic and abiotic processes in marine systems. However, the production of CH<sub>3</sub>Cl via photochemical processes has not been well studied. Here, we reported the production of CH<sub>3</sub>Cl from humic acid (HA) in sunlit saline water and the effects of the concentration of HA, chloride ions, ferric ions and pH were investigated. HA in aqueous chloride solutions or natural seawater were irradiated under an artifici  ...[more]

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