Chemical effects of ultrasound on aqueous solutions. Evidence for. OH and. H by spin trapping
Results of spin-trapping and electron spin resonance studies are reported that provide conclusive evidence for the formation of hydroxyl radicals (.OH) and hydrogen atoms (.H) during the sonolysis of aqueous solutions. Nonvolatile nitrone spin traps, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), ..cap alpha..-tert-butyl-..cap alpha..-(1-methyl-4-pyridinio)nitrone (PyBN), and ..cap alpha..-4-pyridyl-N-tert-butylnitrone 1-oxide(POBN), were used. Experiments were carried out in which scavengers competed with these spin traps for the radicals formed. The formate radical and ethanol were used as scavengers since the reactions of HCOO/sup -/ and C/sub 2/H/sub 5/OH with .OH, .H, and e/sub aq//sup -/ are well known. As a final test, aqueous POBN solutions containing CdSO/sub 4/, a well-known e/sub aq//sup -/ scavenger, were sonicated with no decrease in the signal intensity of H-POBN adduct being noted. This was interpreted as indication that no e/sub aq//sup -/ was being formed. (BLM)
- Research Organization:
- National Cancer Inst., National Institutes of Health, Bethesda, MD
- OSTI ID:
- 6947904
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 104:12; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
ALCOHOLS
AQUEOUS SOLUTIONS
ATOMS
CARBOXYLIC ACID SALTS
CHEMICAL RADIATION EFFECTS
CHEMISTRY
DISPERSIONS
ELECTRON SPIN RESONANCE
ELEMENTS
ETHANOL
FORMATES
HYDROGEN
HYDROXY COMPOUNDS
HYDROXYL RADICALS
MAGNETIC RESONANCE
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RESONANCE
SCAVENGING
SOLUTIONS
SOUND WAVES
ULTRASONIC WAVES