Detection and characterization of phototransients formed in surface waters
- SRI, Menlo Park, CA (USA)
Absorption of sunlight (insolation) by dissolved organic matter (DOM) and nitrite and nitrate ions in natural waters leads to production of a variety of phototransients, including free radicals such as HO and RO{sub 2}, excited species such as singlet oxygen and triplet DOM, and solvated electrons and superoxide. The fate of these phototransients depends on competition among several uni- and bimolecular processes which can remove them. Detection and characterization of phototransients has only been accomplished in the last fifteen years through use of a variety of selective chemical probes, each of which tends to react with one kind of phototransient more selectively than with others; from known rates of reaction of the transient with the probe (k{sub r}) it becomes possible to estimate the steady state concentration of the phototransient.
- OSTI ID:
- 6627232
- Report Number(s):
- CONF-900402--
- Journal Information:
- American Chemical Society, Division of Environmental Chemistry, Preprints; (USA), Journal Name: American Chemical Society, Division of Environmental Chemistry, Preprints; (USA) Vol. 30:1; ISSN ACEPC; ISSN 0093-3066
- Country of Publication:
- United States
- Language:
- English
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540310* -- Environment
Aquatic-- Basic Studies-- (1990-)
CHEMICAL REACTIONS
CHEMISTRY
DETECTION
DOCUMENT TYPES
HYDROXYL RADICALS
MEASURING INSTRUMENTS
MEASURING METHODS
NITRATES
NITRITES
NITROGEN COMPOUNDS
ORGANIC MATTER
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PROCEEDINGS
RADICALS
SURFACE WATERS
TRANSIENTS
WATER CHEMISTRY