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Photochemical degradation rates of tetraphenylborate and diphenylboric acid sensitized by dissolved organic matter in stream water
Author(s) -
Mills Gary L.,
Schwind Donna
Publication year - 1990
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620090505
Subject(s) - chemistry , tetraphenylborate , photodissociation , dissolved organic carbon , singlet oxygen , photochemistry , humic acid , degradation (telecommunications) , organic matter , environmental chemistry , oxygen , inorganic chemistry , organic chemistry , ion , telecommunications , fertilizer , computer science
The photochemical degradation of tetraphenylborate (TPB) and diphenylboric acid (DPBA) was studied in stream water and humic acid solutions. The rates of indirect photolysis of TPB and DPBA were similar and directly proportional to the concentration of stream water dissolved organic matter (DOM) and humic acid for values < 10 mg/L. Direct photolysis of both organoborates was nondetectable during a 2‐h irradiation period. Indirect photolysis rates varied only slightly from pH 6.0 to 9.0, but increased markedly below pH 6.0. Removal of dissolved oxygen increased reaction rates by a factor of two, indicating that the reaction mechanism does not involve singlet oxygen oxygenation.