Standard No.:	GB/T 18204.26-2000
Chinese Name:	公共场所空气中甲醛测定方法
English Name:	Methods for determination of formaldehyde in air of public places
Professional Classification:	C51 Environmental sanitation
Professional Classification:	GB National Standard
ICS Classification:	13.020
Issued by:
Issued on:	2000-09-03
Implemented on:	2001-01-01
Status:	ABOLISHED
Replace By:	GB/T18204.2-2014 Examination methods for public places—Part 2:Chemical pollutants
Replace By Date:	2014-12-01
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	120 (USD)
Delivery:	via email in 1-3 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.