GB/T 15516-1995 in English

《GB/T 15516-1995空气质量 甲醛的测定 乙酰丙酮分光光度法》由467（生态环境部）归口，主管部门为生态环境部。
本标准规定了测定工业废气和环境空气中甲醛的乙酰丙酮分光光度法。本方法适用于树脂制造、涂料、人造纤维、塑料、橡胶、染料、制药、油漆、制革等行业的排放废气，以及作医药消毒、防腐、熏蒸时产生的甲醛蒸气测定。

Air quality—Determination of formaldehyde—
Acetylacetone spectrophotometric method

1 Subject content and applicable scope

1.1 Subject content

This standard specifies acetylacetone spectrophotometric method for determination of formaldehyde in industrial waste gas and ambient air.

1.2 Application scope

1.2.1 This method is applicable to the determination of the exhaust gas discharged from resin manufacturing, coating, artificial fiber, plastic, rubber, dyestuff, pharmaceutical, paint, leather and other industries, as well as the formaldehyde vapor produced during medical disinfection, corrosion prevention and fumigation.

1.2.2 When the sampling volume is 0.5–10.0L, the determination range is 0.5–800 mg/m3.

1.2.3 When the formaldehyde concentration is 20 μg/10 ml, 8 mg phenol (400 times), 10 mg acetaldehyde (500 times) and 600 mg ammonium ion (30,000 times) coexisted without interference; SO2 coexisted is less than 20 μg, NOx coexisted is less than 50 μg, and the recovery rate of formaldehyde is not less than 95%.

2 Principle

After the formaldehyde gas is absorbed by water, it reacts with acetylacetone in the acetic acid-ammonium acetate buffer solution with pH = 6. Under the boiling water bath condition, a stable yellow compound is rapidly formed and measured at the wavelength of 413 nm. The reaction formula is as follows:

Foreword i
1 Subject content and applicable scope
2 Principle
3 Reagents
4 Instruments
5 Sample
6 Procedure
7 Expression of results
8 Precautions
Additional Explanation