Standard No.:	GB/T 18204.26-2000
English Name:	Methods for determination of formaldehyde in air of public places
Chinese Name:	公共场所空气中甲醛测定方法
Chinese Classification:	C51    Environmental sanitation
Professional Classification:	GB    National Standard
Issued by:	CBTS
Issued on:	2000-9-3
Implemented on:	2001-1-1
Status:	superseded
Superseded by:	GB/T 18204.2-2014 Examination methods for public places—Part 2:Chemical pollutants
Superseded on:	2014-12-1
Language:	English
File Format:	PDF
Word Count:	3500 words
Price(USD):	60.00
Delivery:	via email in 1 business day

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