MBTH procedure

The MBTH method is a measuring method for determining short-chain aliphatic aldehydes . The discontinuous method is used to measure emissions .

Structure, procedure and use

For the total determination of short-chain aliphatic aldehydes ( formaldehyde , acetaldehyde and propionaldehyde ), a partial flow of the laden exhaust gas is passed through two washing bottles connected in series , the second bottle being used to check the completeness of the aldehyde absorption. The aldehydes are brought into reaction with a hydrochloride of 3-methyl-2-benzothiazolinonhydrazone (MBTH). In the subsequent reaction with iron chloride , a tetraazapentamethine cyanine cation is formed in two oxidation steps , which can be measured photometrically .

In the ring test the MBTH method and provided with dinitrophenylhydrazine working DNPH method equivalent results. Compared to the DNPH process, the MBTH process is not selective with regard to formaldehyde.

Due to interference, the MBTH method is no longer to be used if the concentration of sulfur dioxide is more than 30 mg / m ³ . Otherwise the results would be considerably lower.

The MBTH procedure was standardized with the VDI guideline VDI 3862 Part 1 . It is used, among other things, to measure emissions in woodworking and processing.

literature

VDI 3862 sheet 1: 1990-12 measurement of gaseous emissions; Measurement of aliphatic aldehydes (C ₁ to C ₃ ) using the MBTH method (Gaseous emission measurement; measurement of aliphatic aldehydes (C ₁ to C ₃ ) MBTH method). Beuth Verlag, Berlin. ( Summary and table of contents online )

Individual evidence

↑ ^a ^b Wolfgang Schreier: Emissions measurements on gas engines. In: Hazardous substances - cleanliness. Air . 69, No. 1/2, 2009, ISSN 0949-8036 , pp. 25-30.
^ ^A ^b Franz Joseph Dreyhaupt (Ed.): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf 1994, ISBN 3-18-400891-6 , p. 515.
↑ VDI 3862 sheet 1: 1990-12 measurement of gaseous emissions; Measurement of aliphatic aldehydes (C ₁ to C ₃ ) using the MBTH method (Gaseous emission measurement; measurement of aliphatic aldehydes (C ₁ to C ₃ ) MBTH method). Beuth Verlag, Berlin, p. 2.
↑ Heiko Hoyen, Martin Vogel, Uwe Karst: Recent developments in the determination of formaldehyde in air samples using derivatizing agents. In: Hazardous substances - cleanliness. Air. 63, No. 7/8, 2003, ISSN 0949-8036 , pp. 295-298.
↑ VDI 3462 Part 6 Emission Reduction; Woodworking and processing; Plant-specific measuring instructions (Emission control; Wood machining and processing; Facility-specific measuring instructions). Beuth Verlag, Berlin, p. 15.

[q1-1] Wolfgang Schreier: Emissions measurements on gas engines. In: Hazardous substances - cleanliness. Air . 69, No. 1/2, 2009, ISSN 0949-8036 , pp. 25-30.

[q2-2] A ^b Franz Joseph Dreyhaupt (Ed.): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf 1994, ISBN 3-18-400891-6 , p. 515.

[3] VDI 3862 sheet 1: 1990-12 measurement of gaseous emissions; Measurement of aliphatic aldehydes (C ₁ to C ₃ ) using the MBTH method (Gaseous emission measurement; measurement of aliphatic aldehydes (C ₁ to C ₃ ) MBTH method). Beuth Verlag, Berlin, p. 2.

[4] Heiko Hoyen, Martin Vogel, Uwe Karst: Recent developments in the determination of formaldehyde in air samples using derivatizing agents. In: Hazardous substances - cleanliness. Air. 63, No. 7/8, 2003, ISSN 0949-8036 , pp. 295-298.

[5] VDI 3462 Part 6 Emission Reduction; Woodworking and processing; Plant-specific measuring instructions (Emission control; Wood machining and processing; Facility-specific measuring instructions). Beuth Verlag, Berlin, p. 15.