Comparison of Aldehyde Methods

Three widely documented methods for the analysis of aliphatic aldehydes in air, i.e., chromotropic acid, 3-methy1-2-benzothiazolone hydrazone (MBTH) and 2,4-dinitrophenyl hydrazone (DNPH), and a modified version of the MBTH method are frequently used for the analysis of aldehydes in diluted diesel e...

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Bibliographic Details
Published in:SAE transactions 1982-01, Vol.91, p.3145-3153
Main Authors: Menzies, Kenneth T., Beltis, Kevin J., Fasano, Rose E.
Format: Article
Language:English
Subjects:
Aldehydes
Cross cultural studies
Cylinders
Diesel engines
Diesel exhaust
Engines
Fatty acids
Hydrazones
Ketones
Standard deviation
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Summary:Three widely documented methods for the analysis of aliphatic aldehydes in air, i.e., chromotropic acid, 3-methy1-2-benzothiazolone hydrazone (MBTH) and 2,4-dinitrophenyl hydrazone (DNPH), and a modified version of the MBTH method are frequently used for the analysis of aldehydes in diluted diesel exhaust. In order to assess their relative accuracy for analysis of aldehydes in such a matrix, a side-by-side comparison of the methods was conducted. The equivalent accuracy of the chromotropic acid, MBTH and DNPH methods for analysis of formaldehyde in a clean air matrix was confirmed and a negative bias in the MBTH method as a result of SO₂ interference was documented. A comparison of the concentrations of formaldehyde and aliphatic aldehydes in diluted diesel exhaust measured by the four methods indicates that significant differences exist between several of them. The concentration of formaldehyde measured by the chromotropic acid and DNPH methods is statistically equivalent while aliphatic aldehyde concentrations increase (limited statistical significance) in the following order: MBTH ≲ DNPH ≲ modified MBTH.
ISSN:0096-736X
2577-1531