1 Scope
This Standard specifies the methods for determination of formaldehyde concentration in air of public places.
This Standard is applicable to the determination of formaldehyde concentration in air of public places.
Method I MBTH Spectrophotometric Method
2 Principle
Formaldehyde in the air and 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH) react to form azine and the azine is oxidized by ferric ion in acid solution to form blue-green compound. Colorimetric assay is conducted according to color shade.
3 Reagent
Water adopted in this method is redistilled water or deionized exchange water, and the reagent adopted is analytically pure.
1 Scope
2 Principle
3 Reagent
4 Apparatus
5 Sampling
6 Analysis Steps
7 Calculation of Results
8 Determination Range, Interfere and Elimination
9 Principle
10 Reagents and Materials
11 Apparatus
12 Sampling
13 Analysis Steps
14 Calculation
Appendix A (Normative) Preparation and Calibration Methods for Sodium Thiosulfate Standard Solution
Appendix B (Informative) Preparation of Manganese Sulfate Filter Paper
