No matter in school or in society, everyone has been exposed to papers. The thesis is an inferential article that studies in various academic fields and describes academic research results. How to write a thoughtful and literary paper? The following is my carefully arranged investigation and analysis paper on formaldehyde pollution in indoor air of residential buildings, for reference only. Let's have a look.

According to the detection and analysis of formaldehyde content in indoor air of Shijiazhuang 100 households, formaldehyde has become the main harmful component threatening human health after home decoration, and the formaldehyde content exceeds the standard widely and seriously. With the extension of the decoration completion time, the formaldehyde content showed a downward trend, but the effect was not obvious. This paper makes a statistical analysis on whether 100 households have furniture. The results show that furniture is another important factor leading to excessive formaldehyde content in indoor air, especially panel furniture, which will obviously aggravate the pollution degree of formaldehyde.

Keywords: indoor environment; Formaldehyde; pollute

1 Introduction

With the rapid development of today's society, ecological environment and sustainable development have become an unavoidable practical problem, especially indoor air pollution, which is closely related to our work and life, has become a major threat to our own health. The extensive use of building materials and decoration materials has significantly increased the types and quantities of harmful substances in indoor air, among which formaldehyde has the most obvious harm to human health.

Formaldehyde is a volatile organic compound, colorless, irritating and easily soluble in water. Formaldehyde mainly comes from plywood, blockboard, medium density fiberboard, particleboard, wood core board and other artificial boards used in interior decoration, as well as wall coatings, wallpaper, chemical fiber carpets, paints, coatings and some organic materials. Formaldehyde has obvious irritation to eyes, respiratory tract, human mucosa and skin; Acute poisoning can lead to tears, runny nose, cough and other symptoms, causing a variety of respiratory diseases; Chronic inhalation of low concentration can cause persistent headache, weakness and insomnia. Long-term exposure to low doses can cause chronic respiratory diseases, menstrual disorders in women, pregnancy syndrome, physical decline of newborns, chromosomal abnormalities, and even induce nasopharyngeal carcinoma; At high concentration, it will cause harm to people's nervous system and liver. In view of the serious harm of formaldehyde, in September of 20 10, we investigated, sampled and tested the residential buildings of Shijiazhuang 100 in strict accordance with the national standard method, and made a scientific analysis and summary of the final data.

2 detection method of methanol in indoor air

2. 1 sampling method

A representative room was randomly selected from 500 owners who signed up for the free indoor air testing in the capital of Hebei Province to inspect the houses of 100 owners. Sampling shall be carried out in strict accordance with Indoor Air Quality Standard (GB/T 18883-2002), and the number of sampling points shall be determined according to the monitored indoor area and site conditions. In principle, there should be (1~3) points in a room less than 50m2, which are evenly distributed in a diagonal or quincunx shape, and the distance from the wall should be greater than 0.5m Before sampling, the doors and windows of the tested room should be closed after full ventilation (12h).

2.2 detection methods

The samples were analyzed by "phenol reagent spectrophotometry" in the national standard. The principle of this method is that formaldehyde in the air reacts with phenol reagent to generate azine, which is oxidized by iron ions into blue-green compounds in acidic solution. According to the depth of color, it is quantified by colorimetry. The absorbance was measured at 630nm with 10mL closed tube and spectrophotometer.

2.3 Determination of standards

According to Indoor Air Quality Standard (GB/T 18883-2002), formaldehyde is judged to be ≤0. 10mg/m3.

2.4 Analysis of test results

2.4. 1 Overall analysis of test results

The formaldehyde content in 100 houses tested this time is between 0.02 and 0.62 mg/m3. The number of households exceeding the standard is 84, and the unqualified rate is 84%; There are 23 households exceeding the standard 1 times, accounting for 23% of the total and 27% of the unqualified households; There are 16 households that exceed the standard by more than 2 times, accounting for 16% of the total households and19% of the unqualified households; The maximum exceeds the standard by 52 times.

2.4.2 Influence of decoration completion time on formaldehyde content

Table 1 is the statistics of 100 house decoration completion time and measured formaldehyde content in the air and the over-standard rate, which can directly reflect the trend of formaldehyde content in the air changing with the decoration completion time. It can be clearly seen from the following table that the formaldehyde content in indoor air is the most serious within 1 month after the renovation, and only two of the 26 houses inspected are qualified, with the over-standard rate reaching 92% and the highest over-standard multiple even reaching 5.2 times; With the extension of decoration completion time, the formaldehyde content in indoor air decreased slightly. If the renovation completion time is 1~6 months, the over-standard rate will be reduced to 89%, and the maximum over-standard multiple will be 3.8 times. If the renovation is completed in 6~ 12 months, the over-standard rate will be reduced to 76%, and the maximum over-standard multiple will be 2. 1 times; If the renovation completion time exceeds 1 year, the over-standard rate will be reduced to 67%, and the maximum over-standard multiple is 1.6 times. As can be seen from these data, with the extension of the decoration completion time, the formaldehyde content is decreasing, but the effect is not obvious. After the renovation of 1 year is completed, half of the indoor air formaldehyde content is still unqualified. Compared with other pollutants, formaldehyde volatilization is a long process. When people move into new houses, they must be alert to the composition and content of formaldehyde in indoor air. They must ventilate the room for a while before moving in, and keep a lot of ventilation after moving in.

Table 1 Statistics of Decoration Completion Time and Formaldehyde Content

Decoration completed

Time sample number/family content range/mg/m3 formaldehyde standard/mg/m3 over-standard number/family over-standard rate/%

1 month 260.09 ~ 0.620+0 536686366

1~6 months, 370.06 ~ 0.80. 56667.866668666667

6 ~1February 250.06 ~ 0.310.10/976

Over 1 year, 120.02 ~ 0.260. 36636.866666666667

Total:1000.02 ~ 0.620+000000001

2.4.3 Influence of furniture on formaldehyde content

This inspection activity also carried out statistics on whether the inspected houses are stationed in furniture and furniture categories. See Table 2 for details. For houses without new furniture after decoration, the formaldehyde content in indoor air exceeds the standard rate of 75%, and the highest exceeding multiple is 3.3 times; The formaldehyde content in the indoor air of solid wood furniture houses exceeds the standard rate of 80%, and the highest exceeding multiple is 3.5 times; The formaldehyde content in the indoor air of panel furniture residence exceeds the standard rate of 93%, and the maximum exceeding multiple is 5.2 times. It can be seen that the more furniture placed indoors, especially the more panel furniture, the more serious the formaldehyde content in indoor air exceeds the standard, and furniture can obviously aggravate the formaldehyde pollution in indoor air.

Table 2 Statistics of Furniture and Formaldehyde Content

Decoration completed

Time sample number/family content range/mg/m3 formaldehyde standard/mg/m3 over-standard number/family over-standard rate/%

No furniture: 320.02 ~ 0.430+00048388631

Solid wood furniture 250.05 ~ 0.450.6438+002080

Panel furniture 430.06 ~ 0.620.6438+004093

Total:1000.02 ~ 0.620+000000001

2.5 Test conclusion

(1) The formaldehyde exceeds the standard seriously. 100 households, there are 84 households whose indoor air formaldehyde exceeds the standard, and the unqualified rate is 84%; 23 households exceeded the standard 1 times, accounting for 27% of unqualified households; There are 16 households exceeding the standard by more than 2 times, accounting for 19% of the unqualified households. It can be seen that the existence of formaldehyde in the indoor air of residential buildings is universal and serious.

(2) The effect of decoration completion time on formaldehyde content in indoor air is not significant. With the extension of the decoration completion time, the formaldehyde content decreased slightly, but the downward trend was not obvious.

(3) The choice of furniture is another important factor that leads to the formaldehyde content in indoor air exceeding the standard. By comparing the formaldehyde content in the indoor air with or without furniture, we will find that the formaldehyde content in the furnished room is much higher than that in the unfurnished room, especially the panel furniture will obviously aggravate the formaldehyde pollution.

3 methanol pollution prevention and control measures

3. 1 Optimize home decoration scheme and construction technology

In home decoration, we should try to choose qualified decoration companies, optimize the design scheme, pay attention to the space bearing capacity and material consumption, strictly control all kinds of materials used in decoration, and adopt advanced construction technology. Only in this way can indoor environmental pollution caused by construction be reduced.

3.2 standardize the choice and purchase of furniture

When buying furniture, be sure to ask the instructions provided by the manufacturer, pay special attention to the main materials described in the instructions and the content of harmful substances in the main materials, and choose to buy in strict accordance with national standards.

3.3 Strengthen ventilation measures to improve purification capacity.

After the decoration is completed, it needs to be ventilated for a certain period of time to maintain air circulation to reduce indoor air pollution. This is a simple and effective method to improve indoor air quality. In addition, green plants can be planted indoors, and adsorption materials such as activated carbon and silica gel can be placed to strengthen the removal of harmful substances in indoor air.

References:

Feng Ruiyu. Analysis and countermeasures of indoor environmental pollution. Hebei enterprises, 2009 (8): 74 ~ 75.

Su Ying, Yao Feng, Zhao Hongwei, etc. Present situation and control of indoor decoration air pollution in Chongqing. Laboratory medicine and clinic, 20 10/0,7 (8): 747 ~ 748.

State bureau of quality and technical supervision. GB/T 18204.26-2000 Determination of Formaldehyde in the Air of Public Places. Beijing: China Standards Publishing House, 2000.

Ju Ningsheng. Present situation and investigation of air quality in newly-built dormitories in colleges and universities. Modern science and technology, 2009, 8 (7): 26 ~ 27.

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