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

College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
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Int. J. Environ. Res. Public Health 2020, 17(2), 503; https://doi.org/10.3390/ijerph17020503
Received: 20 November 2019 / Revised: 2 January 2020 / Accepted: 9 January 2020 / Published: 13 January 2020
(This article belongs to the Section Environmental Science and Engineering)
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. View Full-Text
Keywords: methyl chloride; humic acid; photochemical production; ferric ion methyl chloride; humic acid; photochemical production; ferric ion
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MDPI and ACS Style

Liu, H.; Pu, Y.; Tong, T.; Zhu, X.; Sun, B.; Zhang, X. Photochemical Generation of Methyl Chloride from Humic Aicd: Impacts of Precursor Concentration, Solution pH, Solution Salinity and Ferric Ion. Int. J. Environ. Res. Public Health 2020, 17, 503.

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