How to detect formaldehyde at home

How to detect formaldehyde at home

How to detect formaldehyde at home. Now living conditions are getting better and better. More and more real estate developers have handed over a house, which means they have to decorate a new house. Therefore, many families now have Everyone has the problem of excessive formaldehyde. The following is a detailed introduction on how to detect formaldehyde at home. How to detect formaldehyde at home 1

1. Judge by smelling the indoor odor

Newly renovated homes and office building rooms or New buyers have pungent, eye-catching and other irritating odors, and the odor persists for a long time. There is an obvious pungent smell when you are close to a wall or furniture. In this case, you can basically feel that the indoor formaldehyde in the home exceeds the standard.

2. You can judge based on the physical condition of yourself or your family members

For example, after moving into a new home, your family members’ resistance becomes worse, they feel unwell, dizzy, and their immunity decreases. The sickness rate of personnel has increased, and the eyes feel watery. Under normal circumstances, the indoor formaldehyde exceeds the standard.

3. Observe the reactions of animals and plants

If you find that a large number of plants have withered and died after moving into a new home, if you have pets at home, it is also possible that the pets will get sick, not like to eat, or even die. It means that the formaldehyde in your home exceeds the standard.

4. Formaldehyde self-test kit method

The simplest way to detect whether formaldehyde exceeds the standard is to use a formaldehyde detection kit. The formaldehyde detection kit is also very cheap and simple to operate. The test box is similar to a pH test paper, and you can roughly estimate whether formaldehyde exceeds the standard by its color. In actual operation, it has a certain reference effect on serious pollution exceeding the standard, but it is impossible to make an objective and accurate judgment on general pollution exceeding the standard.

5. Electrochemical method-formaldehyde detector

This method is portable, but the disadvantage is that the quality varies, the selection is difficult, and the price ranges from 100 yuan to 100 yuan. Ranging from ten thousand yuan. In actual operation, if imported equipment is used, indoor formaldehyde content can be measured more accurately.

6. Spectrophotometry - special detector for indoor air

This method has higher detection accuracy, but the disadvantage is that the price and quality vary, ranging from hundreds to thousands of yuan. etc.; In addition, the operation process is complicated and has certain operational difficulty. In actual operation, using high-quality equipment manufactured by institutions and operated by professionals, indoor air quality conditions can be measured more accurately.

7. Testing through professional institutions

Environmental testing by professional institutions is based on the national indoor air quality standards and uses professional indoor air quality testing equipment. The indoor air is sampled and then sent to the laboratory for testing and analysis, and the results are authoritative. However, it is more expensive to hire a professional company.

Tips for formaldehyde removal

1. Activated carbon adsorption method

Activated carbon is an internationally recognized expert in taking drugs. Activated carbon masks and gas masks all use activated carbon. This product uses the physical effects of activated carbon to deodorize and detoxify; it does not contain any chemical additives and has no impact on the human body. Put two to three dishes in each house, and the indoor odor can be basically eliminated in 72 hours. This method can be used for medium and low pollution, or it can be used in combination with other chemical methods to achieve better comprehensive treatment results.

2. Ventilation method

Through the circulation of indoor air, the content of harmful substances in the indoor air can be reduced, thereby reducing the harm of such substances to the human body. In winter, people often close their doors and windows tightly, and indoor and outdoor air cannot circulate. Not only will the content of formaldehyde in the indoor air increase, but radon will also continue to accumulate, even reaching very high concentrations.

3. Remove formaldehyde by local methods

Make hot tea with 300 grams of black tea in two basins of water, put it in the room, and open the window for ventilation. The indoor formaldehyde content will drop by 90% within 48 hours. % or above, the pungent odor is basically eliminated.

4. Plant deodorization method

For medium and low pollution, plant decontamination can be selected: Generally, indoor environmental pollution is mild and moderate, and the pollution value is less than 3 times the national standard. environment, the use of plant purification can achieve better results. Choose and place plants according to the different functions and area of ??the room. Under normal circumstances, in a room of about 10 square meters, it is more appropriate to place two pots of 1.5-meter-high plants.

5. Photocatalyst decomposition method

Under the stimulation of light, the catalyst in the photocatalyst reacts with oxygen and moisture in the air to generate negative ions and hydroxyl radicals, which can oxidize and decompose various Organic pollutants and inorganic pollutants are eventually degraded into harmless substances such as carbon dioxide, water and corresponding acids, thereby achieving the function of decomposing pollutants and purifying the air. How to test formaldehyde at home 2

1. How to test formaldehyde by yourself at home

The decoration has just been completed, if you suspect that formaldehyde exceeds the standard. We can use a formaldehyde detection test paper, which can detect whether formaldehyde exceeds the standard, through the reaction between the reagent and formaldehyde, and a color comparison card.

When making specific measurements, first close the room to be measured, for example, for two hours, then pour the liquid in the bottle into the box, tighten the plastic bottle, and shake it to fully dissolve it. . Open the bottle cap again, place the plastic box in the room, about one meter above the ground, and close the doors and windows. Wait 30 to 40 minutes before pouring all the colorless glass bottle liquid into it.

Keep shaking and compare with the color chart. If it appears yellow, it means the content is not high. But if it turns green, it means the formaldehyde exceeds the standard, and if it turns blue, it means the exceedance is very serious.

2. What is the appropriate concentration of formaldehyde?

1. If the formaldehyde concentration detected by test paper exceeds the standard, according to my country’s standards, the indoor concentration should be within 0.1 mg per cubic meter, and the concentration should not exceed 0.1 mg per cubic meter. It can exceed 0.1 mg, otherwise it will be deemed to be excessive. If it is below this range, the indoor environment will not cause harm to the body.

2. As a limit value, 0.1 will have a certain impact on the human body. If it reaches 0.5 mg, it will have a stimulating effect. For example, our eyes will shed tears inexplicably, and if the concentration reaches 0.6 mg per cubic meter, the throat will feel uncomfortable and you will often feel a sore throat. If it is measured to reach 30 milligrams per cubic meter, this data is very scary. It has exceeded the standard many times, and the most serious cases are likely to cause death.

How to detect formaldehyde at home 3

There are three main places where formaldehyde gas appears indoors:

1. In the air

1. Used as wall panels, ceilings, etc. Various types of phenolic resin glue-based artificial boards for decorative materials, such as plywood, thin boards, fiberboards and particleboards, etc.

2. Decorative materials that contain formaldehyde and may emit to the outside world, such as wall coverings, wall coverings, etc. Wallpaper, paint and paint tubes.

3. Indoor displays and daily necessities that may emit formaldehyde, such as furniture, chemical fiber carpets and foam plastics.

4. After burning, it will Certain materials that emit formaldehyde, such as cigarettes and some organic materials.

5. Some fragrances and mosquito killers also contain formaldehyde.

2. In clothing

White stiff or no-iron clothing, especially some jeans, clothes that claim to be 100% anti-wrinkle and shrink-proof, or cotton no-iron shirts that are shaped with glyoxal resin, all contain formaldehyde. Formaldehyde is harmful to human skin. Strong irritation, can cause skin eczema, systemic allergies.

3. In food

Formaldehyde is added to food, often causing whitening, protein coagulation, and The role of preservation and antisepsis.

Common methods for indoor formaldehyde detection can be divided into:

1. Phenol reagent spectrophotometry:

When measuring, the equipment The bubble absorption tube with absorption liquid (phenol reagent solution) is connected to the air sampler for sampling; use the absorption liquid to prepare the formaldehyde standard solution series and reagent blank solution; use a spectrophotometer to measure the standard solution series, reagent blank solution and gas at a wavelength of 630nm. The absorbance of the sample absorption liquid; draw a standard curve to calculate the concentration of formaldehyde in the air.

2. Gas Chromatography:

Gas chromatography is a type of chromatography. In chromatography There are two phases, one phase is the mobile phase and the other is the stationary phase. If a liquid is used as the mobile phase, it is called liquid chromatography, and if a gas is used as the mobile phase, it is called gas chromatography.

Gas phase Chromatography can be divided into two types due to the different stationary phases used. Those that use solid adsorbents as the stationary phase are called gas-solid chromatography, and those that use monomers coated with stationary liquid as the stationary phase are called gas-liquid chromatography.

The principle is that after formaldehyde gas is absorbed by water, it reacts with acetylacetone in an acetic acid-ammonium acetate buffer solution with pH=6, and under boiling water bath conditions, A stable yellow compound is quickly generated and measured at a wavelength of 413nm.

4. Quality Supervision Bureau and Environmental Protection Bureau

In addition to large testing units such as Quality Supervision Bureau and Environmental Protection Bureau, there are also many The biggest advantage of a professional testing company with CMA qualification is its authoritativeness and very high testing accuracy, which can be accurate to a few tenths of a percent. However, its testing time is relatively long, generally taking 3-7 days, and large-scale unit testing The cost is also very high, and is charged according to the monitoring point

Generally, it is 350 yuan/point for a family, and 550 yuan/point for a unit. For a family, one room can be counted as one point; for a unit, 20 square meters is counted as one point. , the cost is between 350-400, 50 is equal to 3 points, the price is 900-1000 yuan, usually used for treatment re-inspection.