Accession Number:

ADA383473

Title:

Photochemical Degradation Of Hazardous Chemicals In Natural Water And Soil

Descriptive Note:

Final rept. 15 May 1994-14 May 1998

Corporate Author:

STATE UNIV OF NEW YORK AT ALBANY

Report Date:

2000-07-31

Pagination or Media Count:

137.0

Abstract:

The aquatic photochemistry of two high-energy compounds was investigated as a part of a larger study of their environmental fate. Ammonium dinitramide ADN absorbs light 4OOnm and degrades rapidly upon exposure to sunlight. Half- lives for the photolysis of ADN at the surface of a body of water were calculated as six minutes for a location in Syracuse NY. However. much of the light that degrades ADN directly is absorbed in the top layer of water the half-life at a depth of 2m was calculated as 15 years. A model of the absorption of light passing through the water column in combination with quantum yields was used in order to compare predicted and observed rates in Onondaga Lake, with good agreement. Dark solutions of ADN were stable indefinitely and indirect photolysis did not provide a significant decay mechanism. Although quadricyclane did not photolyze in distilled water it degraded if natural dissolved organic matter DOM was also present. This phenomenon was ascribed to the reaction of quadricyclane with hydroperoxy HOO and its conjugate base, superoxide O2. The kinetics of this reaction were tested through the use of an alternative HOO02 generator, xanthine-xanthine oxidase and a probe. ferricytochrome C.

Subject Categories:

  • Organic Chemistry
  • Water Pollution and Control
  • Environmental Health and Safety

Distribution Statement:

APPROVED FOR PUBLIC RELEASE