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https://doi.org/10.1016/S0043-1354(03)00039-3
| Title: | Degradation of monomethylmercury chloride by hydroxyl radicals in simulated natural waters | Authors: | Chen, J. Pehkonen, S.O. Lin, C.-J. |
Keywords: | Degradation Formaldehyde Mechanisms Methylmercury Natural waters OH radical |
Issue Date: | May-2003 | Citation: | Chen, J., Pehkonen, S.O., Lin, C.-J. (2003-05). Degradation of monomethylmercury chloride by hydroxyl radicals in simulated natural waters. Water Research 37 (10) : 2496-2504. ScholarBank@NUS Repository. https://doi.org/10.1016/S0043-1354(03)00039-3 | Abstract: | The degradation of methylmercury chloride by hydroxyl radicals (·OH) has been investigated using nitrate photolysis from 285 to 800nm with a 450W Xenon lamp as the ·OH source. The identified products are Hg2+, Hg0, CHCl3 and formaldehyde. The second-order rate constant at pH of 5 at room temperature was determined to be 9.83(+-0.66)×109M-1s-1using benzoic acid as the ·OH scavenger. The effects of chloride concentration and methylmercury speciation have also been investigated. A mechanism of the CH3HgCl-·OH reaction has been proposed. The calculated methylmercury degradation rates in natural waters using the above rate constant were comparable to the in situ photodegradation rates reported previously, indicating that degradation by •OH may be one of the important pathways of methylmercury degradation in sunlit surface waters. © 2003 Elsevier Science Ltd. All rights reserved. | Source Title: | Water Research | URI: | http://scholarbank.nus.edu.sg/handle/10635/91919 | ISSN: | 00431354 | DOI: | 10.1016/S0043-1354(03)00039-3 |
| Appears in Collections: | Staff Publications |
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