Photolytic degradation of methylmercury enhanced by binding to natural organic ligands

Nature Geoscience

Volumn 3, Issue 7, 2010, Pages 473-476

  Zhang, Tong ^a   Hsu Kim, Heileen ^a  

^a Duke University   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

BIOACCUMULATION; FOOD WEB; HEALTH RISK; LIGAND; METHYLMERCURY; PHOTOCHEMISTRY; PHOTODEGRADATION; PUBLIC HEALTH;

EID: 77954230148     PISSN: 17520894     EISSN: 17520908     Source Type: Journal    
DOI: 10.1038/ngeo892     Document Type: Article

References (30)

1. Mergler, D. et al. Methylmercury exposure and health effects in humans: A worldwide concern. Ambio 36, 3-11 (2007).
2. Lehnherr, I. & St Louis, V. L. Importance of ultraviolet radiation in the photodemethylation of methylmercury in freshwater ecosystems. Environ. Sci. Technol. 43, 5692-5998 (2009).
3. Sellers, P., Kelly, C. A., Rudd, J. W. M. & MacHutchon, A. R. Photodegradation of methylmercury in lakes. Nature 380, 694-697 (1996).
4. Hammerschmidt, C. R. & Fitzgerald, W. F. Photodecomposition of methylmercury in an Arctic Alaskan lake. Environ. Sci. Technol. 40, 1212-1216 (2006).
5. Whalin, L., Kim, E-H. & Mason, R. Factors influencing the oxidation, reduction, methylation and demethylation of mercury species in coastal waters. Mar. Chem. 107, 278-294 (2007).
6. Marvin-Dipasquale, M. C. & Oremland, R. S. Bacterial methylmercury degradation in Florida Everglades peat sediment. Environ. Sci. Technol. 32, 2556-2563 (1998).
7. Oremland, R. S., Culbertson, C. W. & Winfrey, M. R. Methylmercury decomposition in sediments and bacterial cultures: Involvement of methanogens and sulfate reducers in oxidative demethylation. Appl. Environ. Microbiol. 57, 130-137 (1991).
8. Sellers, P., Kelly, C. A. & Rudd, J. W. M. Fluxes of methylmercury to the water column of a drainage lake: The relative importance of internal and external sources. Limnol. Oceanogr. 46, 623-631 (2001).
9. Hoigne, J. & Bader, H. in Organometals and Organo-Metalloids; Occurrence and Fate in the Environment (eds Brinckman, F. E. & Bellama, J. M.) 292-313 (ACS Symposium Series, Vol. 82, American Chemical Society, 1978).
10. Chen, J., Pehkonen, S. O. & Lin, C-J. Degradation of monomethylmercury chloride by hydroxyl radicals in simulated natural waters. Water Res. 37, 2496-2504 (2003).
11. Hoigne, J. Comment on 'Degradation of monomethylmercury chloride by hydroxyl radicals in simulated natural waters'. Water Res. 38, 3470-3471 (2004).
12. Zepp, R. G., Hoigne, J. & Bader, H. Nitrate-induced photooxidation of trace organic-chemicals in water. Environ. Sci. Technol. 21, 443-450 (1987).
13. Southworth, B. A. & Voelker, B. M. Hydroxyl radical production via the photo-Fenton in the presence of fulvic acid. Environ. Sci. Technol. 37, 1130-1136 (2003).
14. Vermilyea, A. W. & Voelker, B. M. Photo-Fenton reaction at near neutral pH. Environ. Sci. Technol. 43, 6927-6933 (2009).
15. Suda, I., Suda, M. & Hirayama, K. Degradation of methyl and ethyl mercury by singlet oxygen generated from sea water exposed to sunlight or ultraviolet light. Arch. Toxicol. 67, 365-368 (1993).
16. Grandbois, M., Latch, D. E. & McNeill, K. Microheterogeneous concentrations of singlet oxygen in natural organic matter isolate solutions. Environ. Sci. Technol. 42, 9184-9190 (2008).
17. Latch, D. E. & McNeill, K. Microheterogeneity of singlet oxygen distributions in irradiated humic acid solutions. Science 311, 1743-1747 (2006).
18. Waples, J. S., Nagy, K. L., Aiken, G. R. & Ryan, J. N. Dissolution of cinnabar (HgS) in the presence of natural organic matter. Geochim. Cosmochim. Acta 69, 1575-1588 (2005).
19. Brezonik, P. L. Chemical Kinetics and Process Dynamics in Aquatic Systems (CRC Press, 1993).
20. Schmidt, R. & Afshari, E. Collisional deactivation of O-2(1-Delta-G) by solvent molecules - comparative experiments with O-16(2) and O-18(2). Ber. Bunsenges. Phys. Chem. Chem. Phys. 96, 788-794 (1992).
21. Boreen, A. L., Edhlund, B. L., Cotner, J. B. & McNeill, K. Indirect photodegradation of dissolved free amino acids: The contribution of singlet oxygen and the differential reactivity of DOM from various sources. Environ. Sci. Technol. 42, 5492-5498 (2008).
22. Zepp, R. G., Schlotzhauer, P. F. & Sink, R. M. Photosensitized transformations involving electronic-energy transfer in natural waters: Role of humic substances. Environ. Sci. Technol. 19, 74-81 (1985).
23. Hintelmann, H., Keppel-Jones, K. & Evans, R. D. Constants of mercury methylation and demethylation rates in sediments and comparison of tracer and ambient mercury availability. Environ. Toxicol. Chem. 19, 2204-2211 (2000).
24. Amirbahman, A., Reid, A. L., Haines, T. A., Kahl, J. S. & Arnold, C. Association of methylmercury with dissolved humic acids. Environ. Sci. Technol. 36, 690-695 (2002).
25. Hsu-Kim, H. Stability of metal-glutathione complexes during oxidation by hydrogen peroxide and Cu(II)-catalysis. Environ. Sci. Technol. 41, 2338-2342 (2007).
26. Abedinzadeh, Z., Gardes-Albert, M. & Ferradini, C. Kinetic study of the oxidation mechanism of glutathione by hydrogen peroxide in neutral aqueous medium. Can. J. Chem. 67, 1247-1255 (1989).
27. Ni, B., Kramer, J. R., Bell, R. A. & Werstiuk, N. H. Protonolysis of the Hg-C bond of chloromethylmercury and dimethylmercury. A DFT and QTAIM study. J. Phys. Chem. A 110, 9451-9458 (2006).
28. Tossell, J. A. Theoretical studyofphotodecomposition ofmethyl Hgcomplexes. J. Phys. Chem. A 102, 3587-3591 (1998).
29. Hintelmann, H., Welbourn, P. M. & Evans, R. D. Measurement of complexation of methylmercury(II) compounds by freshwater humic substances using equilibrium dialysis. Environ. Sci. Technol. 31, 489-495 (1997).
30. Karlsson, T. & Skyllberg, U. Bonding of p.p.b. levels of methyl mercury to reduced sulfur groups in soil organic matter. Environ. Sci. Technol. 37, 4912-4918 (2003).