+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Comparison of photochemical behavior of various humic substances in water 2. photo sensitized oxygenations



Comparison of photochemical behavior of various humic substances in water 2. photo sensitized oxygenations



Chemosphere 10(1): 119-126



Photochemical oxygenation of 2,5-dimethylfuran (DMF) in water was studied under a variety of reaction conditions employing various humic substances as photosensitizers. As predicted by theory, reactions at low DMF concentrations were 1st order with respect to DMF and reaction rate constants were directly proportional to the average light intensity and to the concentration of humic substance. The rate of oxygenation photosensitized by the humic matter from a river was independent of H+ activity in pH 5-9 range. Wavelength studies indicated that oxygenations photosensitized by humic substances were induced by UV and blue radiation. Rate constants computed for this photosensitized reaction in sunlight were in close agreement with experimental values. The ratio of sunlight rate constants to total visible solar irradiance (400-700 nm) was approximately constant. It may be possible to calibrate rate constants for photosensitized reactions in terms of commonly measured units of visible light intensity such as foot candles.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 005010882

Download citation: RISBibTeXText


Related references

Comparison of photochemical behavior of various humic substances in water 1. sun light induced reactions of aquatic pollutants photo sensitized by humic substances. Chemosphere 10(1): 109-118, 1981

Comparison of photochemical behavior of various humic substances in water: I. Sunlight induced reactions of aquatic pollutants photosensitized by humic substances. Chemosphere 10(1): 109-117, 1981

Comparison of photochemical behavior of various humic substances in water; III, Spectroscopic properties of humic substances. Chemosphere 10(5): 479-486, 1981

Production and quenching of singlet oxygen by the sensitizer in dye-sensitized photo-oxygenations. Journal of Photochemistry 25(2-4): 117-125, 1984

Water treatment related characterization of the photochemical degradation products of aquatic humic substances. Zeitschrift fuer Wasser- und Abwasser- Forschung 20(4): 118-122, 1987

Humic-like substances of bacterial origin. I. Some aspects of the formation and nature of humic-like substances produced. II. Fractionation of the bacterial humic-like substances by gel filtration on sephadex gels. III. Production of humic-like substances by Pseudomonas acidovorans in media containing certain benzene derivatives. Acta Microbiologica Polonica 26(4): 377-386; 387-392; 393-401, 1977

Photogeneration of singlet oxygen by humic substances: comparison of humic substances of aquatic and terrestrial origin. Photochemical and Photobiological Sciences 3(3): 273-280, 2004

Solution thermochemistry of humic substances; acid-base equilibria of river water humic substances. ACS Symposium Series 93: 99-114, 1979

Marine humic substances; I, Isolation of humic substances of sea water with an effective adsorbent, adsorption resin GDX-102. Haiyang yu Huzhao = Oceanologia et Limnologia Sinica 13(4): 370-379, 1982

Studies in seawater and lake water on interactions of trace metals with humic substances isolated from marine and estuarine sediments 1. characterization of humic substances. Marine Chemistry 15(3): 217-230, 1984

Capillary electrophoretic separation of humic substances using hydroxyethyl cellulose as a buffer additive and its application to characterization of humic substances in a river water sample. Analytical and Bioanalytical Chemistry 393(2): 761-766, 2009

Humic-like substances from landfill leachates-characterization and comparison with terrestrial and aquatic humic substances. Science of the Total Environment 81 & 82: 343-352, 1989

Humic substances: versatile components of plants, soil and water. Proceedings of the Fourth Humic Substances Seminar held at Northeastern University, Boston, Massachusetts, USA, on 22-24 March 2000. Humic substances: versatile components of plants, soil and water Proceedings of the Fourth Humic Substances Seminar held at Northeastern University, Boston, Massachusetts, USA, on 22-24 March 2000: 341 pp., 2000

Complexation of copper lead and cadmium by water soluble humic substances 1. the polarographic proof of heavy metal complexation by water soluble humic substances. Zeitschrift fuer Pflanzenernaehrung und Bodenkunde 147(4): 449-455, 1984

Rates of sensitized photo-oxidation of 2,4,6-trimethylphenol by humic acid. Chemosphere 27(11): 2177-2182, 1993