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Comparison of Aldehyde Methods.

PB82255811

Publication Date	1982
Personal Author	Menzies, K. T.; Beltis, K. J.; Fasano, R. E.
Page Count	57
Abstract	Three widely documented methods for the analysis of aliphatic aldehydes in air, i.e., chromotropic acid, 3-methyl-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 chromatropic 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.
Keywords	Aldehydes Gas analysis Comparison Chemical analysis Exhaust emissions Diesel engine exhaust Benzothiazolone hydrazone/methyl Hydrazone/dinitrophenyl
Source Agency	Coordinating Research Council
NTIS Subject Category	68A - Air Pollution & Control 99A - Analytical Chemistry
Corporate Authors	Little (Arthur D.), Inc., Cambridge, MA.; Coordinating Research Council, Inc., Atlanta, GA.
Document Type	Technical Report
NTIS Issue Number	198225
Contract Number	CAPE-30-81(1-81)-CRC

Comparison of Aldehyde Methods.

Comparison of Aldehyde Methods.
PB82255811

Publication Date	1982
Personal Author	Menzies, K. T.; Beltis, K. J.; Fasano, R. E.
Page Count	57
Abstract	Three widely documented methods for the analysis of aliphatic aldehydes in air, i.e., chromotropic acid, 3-methyl-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 chromatropic 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.
Keywords	Aldehydes Gas analysis Comparison Chemical analysis Exhaust emissions Diesel engine exhaust Benzothiazolone hydrazone/methyl Hydrazone/dinitrophenyl
Source Agency	Coordinating Research Council
NTIS Subject Category	68A - Air Pollution & Control 99A - Analytical Chemistry
Corporate Authors	Little (Arthur D.), Inc., Cambridge, MA.; Coordinating Research Council, Inc., Atlanta, GA.
Document Type	Technical Report
NTIS Issue Number	198225
Contract Number	CAPE-30-81(1-81)-CRC