Spectroscopic and kinetic studies of a new metastable species in the photooxidation of gaseous formaldehyde

Su, Fu; Calvert, Jack G.; Shaw, John H.; Niki, H.; Maker, P. D.; Savage, C. M.; Breitenbach, L.D.

doi:10.1016/0009-2614(79)87053-0

“…Photolysis of HCHO by the visible lamps (A > 400 nm) used was negligible, but some HCHO was consumed by reaction with H02, as evidenced by the formation of HC(0)OH [17,18]. The yields of HC(0)OH were typically less than 8% of the HCHO reacted.…”

Section: Resultsmentioning

confidence: 98%

FTIR spectroscopic study of the Cl‐ and Br‐atom initiated oxidation of ethene

Yarwood

¹

,

Peng

²

,

Niki

³

1992

Int J of Chemical Kinetics

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The reaction mechanism of the halogen (C1 and Br)-atom initiated oxidation of C2Hd was studied using the long path FTIR spectroscopic method in 700 torr of air at 296 ? 2 K. Among the major halogen-containing products were X -CHzCHO, X-CHzCHzOH, and X-CH~CHZOOH (X = C1 or Br) which were shown to be formed via the self-reaction of the X-CHZCHZOO radicals, i.e., 2X-CH2CH200 + 2X-CH2CH20 + 0 2 ; (a) 2X-CHZCHZOO + X-CHzCHO + X-CH2CH20H + 0 2 and (b) followed by X-CHzCHzO + 0 2 + X-CH2CHO + HOZ and X-CHZCH~OO + H02 + X-CH2CHz00H + 02. From the observed yields of X-CH2CHO and X-CHzCHzOH the branching ratios for reactions (a) and (b) were determined to be k./kb = 1.35 2 0.07(20) for both X = C1 and Br.'In addition, the 02-dependence of the rate constant for the Br + CzH4 reaction was determined by the relative rate technique as a function of 0 2 partial pressure from 140 to 700 torr at 700 torr total pressure of N2/02 diluent. Rate constants for the reactions of C1-atoms with Cl-CHZCHO and Br-atoms with Br-CH2CH0 were also determined to be [4.3 2 0 . 2 ( 2~) ]x lo-" and less than or equal to [1.83 ? O.ll(2a)l x cm3 molecule-' s-', respectively.

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“…Besides directly releasing by plant, chemical oxidization is another important source. After the aerosol of formic acid is oxidized from formaldehyde in atmos-1622 phere, it is absorbed by vapor through wet-sediment providing another source for formate in ice cores [14]. In Fig.…”

Section: Articlesmentioning

confidence: 99%

Formate and acetate records in the Muztagata ice core, Northwest Tibetan Plateau

WANGJunxia¹,

YAOTandong²,

XUBaiqing³

et al. 2004

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Formate and acetate concentrations are measured in a 22.56 m-depth ice core recovered in Mt. Muztagata Glacier, northwest Tibetan Plateau. The mean concentrations for formate and acetate in this ice core are 186.6±160.1 and 136.4±133.9 ng/g, respectively. Study shows that there is a positive correlation between formate and nitrate, suggesting both continental origins. However, no significant relationship has been found between formate and acetate, though they both have obvious periodical variations. Because Mt. Muztagata lies in the mid-latitude and is correlative to the nearby human activities, formate and acetate concentrations are higher than those in Greenland and Antarctica. During recent decades, the increase of formate concentration in the Muztagata ice core and formaldehyde production shows a close correlation. We preliminarily presume that the high formate concentration in the Muztagata ice core is concerned with the thriving of house decoration in which excess formaldehyde was used.

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“…Osada et al[l3] also found that major contribution of formate originates from continental sources other than from the ocean. After the aerosol of formic acid is oxidized from formaldehyde in atmos-1622 phere, it is absorbed by vapor through wet-sediment providing another source for formate in ice cores [14]. After the aerosol of formic acid is oxidized from formaldehyde in atmos-1622 phere, it is absorbed by vapor through wet-sediment providing another source for formate in ice cores [14].…”

Section: Articlesmentioning

confidence: 99%

Formate and acetate records in the Muztagata ice core, Northwest Tibetan Plateau

Wang

¹

,

Xu

²

,

Wu

³

et al. 2004

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Formate and acetate concentrations are measured in a 22.56 m-depth ice core recovered in Mt. Muztagata Glacier, northwest Tibetan Plateau. The mean concentrations for formate and acetate in this ice core are 186.6±160.1 and 136.4±133.9 ng/g, respectively. Study shows that there is a positive correlation between formate and nitrate, suggesting both continental origins. However, no significant relationship has been found between formate and acetate, though they both have obvious periodical variations. Because Mt. Muztagata lies in the mid-latitude and is correlative to the nearby human activities, formate and acetate concentrations are higher than those in Greenland and Antarctica. During recent decades, the increase of formate concentration in the Muztagata ice core and formaldehyde production shows a close correlation. We preliminarily presume that the high formate concentration in the Muztagata ice core is concerned with the thriving of house decoration in which excess formaldehyde was used.

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Spectroscopic and kinetic studies of a new metastable species in the photooxidation of gaseous formaldehyde

Cited by 97 publications

References 6 publications

FTIR spectroscopic study of the Cl‐ and Br‐atom initiated oxidation of ethene

FTIR spectroscopic study of the Cl‐ and Br‐atom initiated oxidation of ethene

Formate and acetate records in the Muztagata ice core, Northwest Tibetan Plateau

Formate and acetate records in the Muztagata ice core, Northwest Tibetan Plateau

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