Acetylacetone method

The acetylacetone method , also known as the acetylacetone method , is a measuring method for determining formaldehyde . It is used for both emission and immission measurements. It is based on the Hantzsch dihydropyridine synthesis .

Structure, procedure and use

In the process, the gas to be sampled (a partial flow of the laden exhaust gas in the emission measurement ) is passed through an absorption vessel so that the formaldehyde contained therein is enriched in the absorption solution. The formaldehyde contained in the exhaust gas is reacted with acetylacetone and ammonium acetate to form diacetyldihydrolutidine . Its concentration is recorded photometrically ; Diacetyldihydrolutidine has an absorption maximum at 412 nm . Alternatively, the formaldehyde concentration can be carried out fluorimetrically at low concentrations or for continuous measurement

The acetylacetone process can be used for gases with a high water content. It is used, among other things, for exhaust gases from smokers and furnaces. It is not suitable for exhaust gases that contain more than 10 mg / m ^{3 of} sulfur dioxide , as poor results are then produced due to cross-sensitivities . Acetaldehyde levels that are more than fifty times the formaldehyde content are just as disturbing . In the case of immission measurements, these boundary conditions are generally not a problem.

literature

VDI 3862 sheet 6: 2004-02 measurement of gaseous emissions; Measurement of formaldehyde by the acetylacetone method (Gaseous emission measurement; Measurement of formaldehyde by the acetylacetone method). Beuth Verlag, Berlin. ( Summary and table of contents online )

Individual evidence

↑ VDI 3484 sheet 2: 2001-11 measurement of gaseous immissions; Measuring indoor air pollution; Determination of the formaldehyde concentration by the acetylacetone method (Gaseous ambient air measurements; Indoor-air pollution measurements; Measurement of the formaldehyde concentration with the acatylacetone method). Beuth Verlag, Berlin, p. 4.
↑ VDI 3862 sheet 6: 2004-02 measurement of gaseous emissions; Measurement of formaldehyde by the acetylacetone method (Gaseous emission measurement; Measurement of formaldehyde by the acetylacetone method). Beuth Verlag, Berlin, p. 5.
↑ DIN EN 717-1: 2005-01 wood-based materials; Determination of the formaldehyde release; Part 1: formaldehyde release according to the test chamber method; German version EN 717-1: 2004. Beuth Verlag, Berlin, p. 13.
↑ VDI 3484 sheet 2: 2001-11 measurement of gaseous immissions; Measuring indoor air pollution; Determination of the formaldehyde concentration by the acetylacetone method (Gaseous ambient air measurements; Indoor-air pollution measurements; Measurement of the formaldehyde concentration with the acatylacetone method). Beuth Verlag, Berlin, p. 12.

[1] VDI 3484 sheet 2: 2001-11 measurement of gaseous immissions; Measuring indoor air pollution; Determination of the formaldehyde concentration by the acetylacetone method (Gaseous ambient air measurements; Indoor-air pollution measurements; Measurement of the formaldehyde concentration with the acatylacetone method). Beuth Verlag, Berlin, p. 4.

[2] VDI 3862 sheet 6: 2004-02 measurement of gaseous emissions; Measurement of formaldehyde by the acetylacetone method (Gaseous emission measurement; Measurement of formaldehyde by the acetylacetone method). Beuth Verlag, Berlin, p. 5.

[3] DIN EN 717-1: 2005-01 wood-based materials; Determination of the formaldehyde release; Part 1: formaldehyde release according to the test chamber method; German version EN 717-1: 2004. Beuth Verlag, Berlin, p. 13.

[4] VDI 3484 sheet 2: 2001-11 measurement of gaseous immissions; Measuring indoor air pollution; Determination of the formaldehyde concentration by the acetylacetone method (Gaseous ambient air measurements; Indoor-air pollution measurements; Measurement of the formaldehyde concentration with the acatylacetone method). Beuth Verlag, Berlin, p. 12.