FP-30MK2 (C) type spectrophotometric formaldehyde detector

Formaldehyde, with the chemical formula HCHO, is a colorless gas under normal conditions and has a special irritating odor, which has a stimulating effect on human eyes, nose, etc. When formaldehyde reaches a certain concentration indoors, people will feel uncomfortable.

At present, the identified hazards of formaldehyde can be mainly divided into the following three categories:

a. The main hazard of formaldehyde is its irritating effect on the skin and mucous membranes. Formaldehyde is a toxic substance in the original plasma that can bind to proteins. When inhaled at high concentrations, it can cause severe respiratory irritation, edema, eye irritation, and headaches.

b. Allergenic effect: Direct contact with formaldehyde on the skin can cause allergic dermatitis, pigmentation, and necrosis. Inhalation of high concentrations of formaldehyde can induce bronchial asthma.

c. Mutagenic effect: High concentration formaldehyde is also a genotoxic substance. Experimental animals can cause nasopharyngeal tumors when inhaled at high concentrations in the laboratory.

In clinical practice, it is generally believed that formaldehyde concentrations greater than 0.08mg/m3 can cause redness, itching, discomfort or pain in the throat, hoarseness, chest tightness, dermatitis, etc. The newly renovated room has a high formaldehyde content, and after the decoration is completed, the formaldehyde content should be artificially tested and controlled.

With the improvement of people's living standards, the demand for home decoration is increasing, accompanied by a large amount of decoration pollution. Among the numerous sources of indoor decoration pollution, formaldehyde and benzene derivatives are the most common and harmful.

At present, my detection methods for formaldehyde mainly include 2,4- * hydrazine (DNPH) gas chromatography-mass spectrometry, flow injection fluorescence method, spectrophotometry, sodium sulfite spectrophotometry, reagent colorimetry, etc.

The detection accuracy of these methods varies, with gas chromatography-mass spectrometry generally having a low detection limit of 0.01mg/m3; The lowest detection limit of flow injection fluorescence method is generally 0.01mg/m3; The lowest detection limit of the photoelectric photometric method is generally 0.02mg/m3; The lowest detection limit of spectrophotometry is generally 0.1mg/m3; The lowest detection limit of reagent colorimetric method is generally 0.2mg/m3.

The detection instruments required for these methods are also different. The cost of a single gas chromatography-mass spectrometer required for gas chromatography-mass spectrometry is about 1.5 million yuan; The cost of a single flow injection analyzer required for the flow injection fluorescence method is approximately 800000 yuan; The cost of a single photoelectric photometric detector required for the photoelectric photometric method is about 10000 yuan; The cost of a single spectrophotometer required for spectrophotometry is approximately 20000 yuan; The cost of colorimetric reagents required for the reagent colorimetric method is about 20 yuan.

From this, it can be seen that gas chromatography-mass spectrometry and flow injection method have the highest detection accuracy, but at the same time, the instrument cost is also high, and they are generally suitable for level detection institutions. However, among the commonly used civilian formaldehyde detection products on the market, the reagent colorimetric method has the worst detection accuracy, and it is basically impossible to determine whether formaldehyde content poses a threat to human health. The photoelectric photometric method and the spectrophotometric method are more suitable for use in civilian testing, but the spectrophotometric method has a complex detection process and is difficult for non professionals to complete the detection. Therefore, the photoelectric photometric method is a suitable formaldehyde detection method for civilian use.

In addition, the photoelectric photometry method is more suitable compared to other methods. In the standard GB/T18204 "Methods for hygiene inspection of public places", it is pointed out that the detection of formaldehyde in public places should be carried out using the photoelectric photometric method for formaldehyde content detection.

In summary, when conducting formaldehyde testing after home decoration, it is recommended to use the photoelectric photometric method for measuring formaldehyde content.

Based on this, researchers use aFP-30MK2 (C) type spectrophotometric formaldehyde detector,A comparative experiment was designed in a neutral third-party laboratory (Hangmei Laboratory).

The experiment used a density board as the source of formaldehyde emission. The first data was detected by a gas chromatography-mass spectrometer with a climate chamber, and the second data was obtained byFP-30MK2 (C) type spectrophotometric formaldehyde detectorObtained through testing.

To meet statistical requirements, researchers conducted formaldehyde testing every 6 days, with a total of 20 sets of data tested over a period of 120 days. After 4 months, the researchers summarized the experimental data and calculated the mathematical mean and variance. The average value of data 1 was 0.404 mg/m3, and the average value of data 2 was 0.41 mg/m3. The variance between data 1 and 2 was less than 2%, indicating statistical significance.