Kinetics, mechanism and thermodynamics of bisulfite-aldehyde adduct formation

Conference · Tue Apr 01 04:00:00 EST 1986 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:5432304

Olson, T M; Boyce, S D; Hoffmann, M R

The kinetics and mechanism of bisulfite addition to benzaldehyde were studied at low pH in order to assess the importance of this reaction in stabilizing S(IV) in fog-, cloud-, and rainwater. Previously, the authors established that appreciable concentrations of the formaldehyde-bisulfite adduct (HMSA) are often present in fogwater. Measured HMSA concentrations in fogwater often do not fully account for observed excess S(IV) concentrations, however, so that other S(IV)-aldehyde adducts may be present. Reaction rates were determined by monitoring the disappearance of benzaldehyde by U.V. spectrophotometry under pseudo-first order conditions, (S(IV))/sub T/ >>(phi-CHO)/sub T/, in the pH range 0 - 4.4 at 25/sup 0/C. The equilibrium constant was determined by dissolving the sodium salt of the addition compound in a solution adjusted to pH 3.9, and measuring the absorbance of the equilibrated solution at 250 nm. A literature value of the extinction coefficient for benzaldehyde was used to calculate the concentration of free benzaldehyde. All solutions were prepared under an N/sub 2/ atmosphere using deoxygenated, deionized water and ionic strength was maintained at 1.0 M with sodium chloride.

• Research Organization: California Institute of Technology, W.M. Keck Labs., 138-78, Pasadena, CA 91125
• OSTI ID: 5432304
• Report Number(s): CONF-860425-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 31:2
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID RAIN
ADDITIVES
ALDEHYDES
ATMOSPHERIC CHEMISTRY
ATMOSPHERIC PRECIPITATIONS
BENZALDEHYDE
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
CLOUDS
COMPLEXES
DERIVATIZATION
FOG
HYDROGEN COMPOUNDS
KINETICS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
RAIN
RAIN WATER
REACTION KINETICS
SPECTROPHOTOMETRY
SULFITES
SULFUR COMPLEXES
SULFUR COMPOUNDS
THERMODYNAMICS
WATER
YIELDS