Detection and characterization of phototransients formed in surface waters

Conference · Mon Jan 01 04:00:00 EST 1990 · American Chemical Society, Division of Environmental Chemistry, Preprints; (USA)

OSTI ID:6627232

Mill, T ^[1]

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1. 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--
• Conference Information: Journal Name: American Chemical Society, Division of Environmental Chemistry, Preprints; (USA) Journal Volume: 30:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
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