GB/T 16129-1995 in English

《GB/T 16129-1995居住区大气中甲醛卫生检验标准方法 分光光度法》由361（国家卫生健康委）归口，主管部门为国家卫生健康委。
本标准规定了用分光光度法测定居住区大气中甲醛浓度的方法。也适用于公共场所空气中甲醛浓度的测定。本标准测定范围为2mL样品溶液中含0.2～3.2μg甲醛污染物。

1 Subject Content and Applicable Scope

This standard specifies the spectrophotometric method for determining formaldehyde concentration in air of residential areas. It is also applicable to the determination of formaldehyde concentration in air of public places.

The determination range of this standard is 0.2~3.2μg formaldehyde pollutant in 2mL of sample solution. If the sampling flow is 1L/min and sampling volume is 20L, the determination range of concentration is 0.01~0.16mg/m3.

This method will not be affected by aldehyde, propionaldehyde, n-butyraldehyde, acrolein, butenal, glyoxal, benzaldehyde, methanol, ethanol, n-propyl alcohol, n-butyl alcohol, sec-butyl alcohol, isobutanol, isoamylol and ethyl acetate; there is no interference from the nitrogen dioxide and sulfur dioxide coexisting in the air during the determination.

2 Principle

Formaldehyde condenses (II) with 4-amino-3-hydrazine-5-mercapto-1,2,4-triazol (I) under alkaline condition in air and is oxidized by potassium periodate and generates 6-mercapto-5-triazol [4,3-b]-S-tetrazine (III) compound (aubergine), and the color of this compound is in direct proportion to formaldehyde content. The equations are as follows:

1 Subject Content and Applicable Scope
2 Principle
3 Reagents and Materials
4 Instruments and Equipment
5 Sampling
6 Analytical Procedures
7 Calculation of Results
8 Characteristics of the Method
Additional Explanations: