EffectsofHC/NO_xRATIOSonIrradiated Auto Exhaust,Part II

Nitrogen Balance in Smog Chamber Studies

“…Several alkyl nitrates have also been identified as products in irradiated automobile exhaust. 11 The yields of alkyl nitrates are much lower than PAN yields, however, and can account for only a small percentage of the missing nitrogen. The possible presence of nitroolefins has been tested in irradiated propylene-NO2 mixtures, in irradiated auto exhaust, and in the atmosphere.…”

The 3-Methyl-2-Benzothiazolone Hydrazone Method for Aldehydes in Air: Collection Efficiencies and Molar Absorptivities.

“…The collection efficiencies for propionaldehyde in nitrogen were the same in both the original and the modied procedures; however, the collection efficiency for propionaldehyde in nitrogen in the first bubbler was only 65%. The 75% efficiencies obtained for acetaldehyde and for propionaldehyde and the 84% efficiency previously reported for formaldehyde (6) suggest that the reagent is not contributing appreciably to the solution of the aldehydes. The collection efficiencies are simiiar to those expected for physical solution in water.…”

“…After correction, the collection e5ciency is reduced to about 88%. The collection e5ciency for formaldehyde in the modified procedure is reported to be 84% (6). Values for collection efficiencies obtained in this work for acetaldehyde or propionaldehyde in air were about 75% in the first bubbler and 22% in the second of the three bubblers.…”

“…

SIR: A number of publications have discussed the 3-methyl-Zbenzothiazolone method for aliphatic aldehydes and its applications to analyses of atmospheric and emission samples (1)(2)(3)(4)(5)(6)(7)(8).A modied method has been reported that significantly increases the sensitivity and also eliminates the turbidity that occurs in the original procedure (6). No measurements of the collection efficiencies of aldehydes other than formaldehyde have been reported.

…”

Assessment of the Contribution of Chemical Species to The Eye Irritation Potential of Photochemical Smog

“…11 (Table III, Studies 1-3) and in an irradiated auto exhaust investigation 12 (Table III, Study 4) formaldehyde and acrolein were measured. Using the formaldehyde and acrolein concentrations in Table III, along with the eye irritation intensity parameters in Table II for these two irritants, it is estimated from these sets of results listed that acrolein could cause from 35 to 75% as much irritation as formaldehyde and on the average acrolein could cause about half as much irritation as formaldehyde.…”