How much is considered qualified for formaldehyde testing?

Before 2022, it will be 0.1 mg. After that it is 0.08 mg. Formaldehyde detection of 0.1 mg per cubic meter is considered qualified. The standard concentration value of formaldehyde stipulated in the standard is subdivided into two, namely for Class I civil construction projects and Class II civil buildings. Their standard values ??are slightly different. Formaldehyde in Class I buildings The concentration cannot be higher than 0.07 mg per cubic meter, and the standard value for Class II buildings cannot be higher than 0.08 mg per cubic meter. Therefore, the concentration of formaldehyde detected must be determined according to the different places and various restrictions to determine the qualified concentration.

Formaldehyde testing is a task that many owners will perform, especially after formaldehyde control in new house decoration, it is necessary to determine the effect of the treatment. Only if it meets the standards stipulated by the state will the owners be satisfied with the treatment. After that, you can move into your new house with confidence. So what are the national standards for formaldehyde testing, and what is the testing value to be considered qualified?

What is the standard value of formaldehyde concentration?

The national standard GB/T18883-2002 and the national standard GB/T50325-2020 are currently in use. The standard concentration value of formaldehyde stipulated in the former standard is 0.1 mg per cubic meter, while the latter standard is subdivided into two They are respectively targeted at first-class civil construction projects (residential buildings, hospitals, elderly buildings, kindergartens, school classrooms, etc.) and second-class civil buildings (office buildings, shops, hotels, cultural and entertainment venues, bookstores, libraries, gymnasiums, public buildings, etc.) **Civil construction projects such as traffic waiting rooms), their standard values ??are slightly different. The formaldehyde concentration of Class I buildings cannot be higher than 0.07 mg per cubic meter, and the standard value of Class II buildings cannot be higher than 0.08 mg per cubic meter. Therefore, when testing the concentration of formaldehyde, it is necessary to determine the qualified concentration according to different places and various restrictions.

What is a professional formaldehyde testing agency?

Professional formaldehyde testing should look for formaldehyde testing institutions with CMA qualifications, because the methods and equipment used by institutions with such qualification certificates have been uniformly certified by the country, and the test reports they give It is extremely authoritative and has legal effect. Whether it is a professional CMA testing laboratory or other testing institutions with CMA qualifications, they all have strong professional capabilities and precise professional testing technology, and can issue complete testing reports within a few days. The majority of owners For direct reference, the difference is that the laboratory results are more accurate, and the charging standards are also higher.

What is the method used to detect formaldehyde?

The methods used in professional detection of formaldehyde are mainly spectrophotometry and gas chromatography. Their detection principles are as follows:

Spectrophotometry is to measure the specific wavelength of the substance being measured. The absorbance or luminous intensity of light at or within a certain wavelength range is a method for qualitative and quantitative analysis of the substance. The indoor formaldehyde content is measured through precise detection instruments and some potions; the principle of gas chromatography is that formaldehyde in the air is adsorbed under acidic conditions on a surface coated with 2,4-dinitrophenylhydrazine (2,4-DNPH) 6201 On the support, a stable formaldehyde hydrazone is generated. After elution with carbon disulfide, it is separated by a 0V-chromatographic column and measured with a hydrogen flame ionization detector. The retention time is used for qualitative identification and the peak height is used for quantitative analysis.

The only thing we have to look at for the formaldehyde test results is whether the report is trustworthy. If it is trustworthy, it depends on the concentration of the formaldehyde test. As long as the concentration is strictly lower than or equal to the national standard, you can choose to move in, even if it is a little higher than the standard. It is also absolutely not allowed to stay.