What things need to be paid attention to in formaldehyde detection?

Formaldehyde testing before moving into a new house can be said to be an essential task, especially for families with pregnant women and children at home, and should pay more attention to whether the indoor living environment is safe to avoid irreparable damage. So, what should be paid attention to in the formaldehyde detection of new houses? What are the common detection methods?

Today, let's find out!

First of all, let's understand why we need to test for formaldehyde in new houses?

In the process of decorating a new house, whether it is environmentally friendly materials or non-environmentally friendly materials, there will be more or less formaldehyde. As we all know, the release period of formaldehyde can be as long as 3 to 15 years, and the harm to the human body has the characteristics of long-term, latent and hidden. If people are in an environment where formaldehyde exceeds the standard and do not know it, inhaling excessive formaldehyde in the long run will not only cause a decrease in immunity, easy to catch a cold and get sick, but also can lead to miscarriage in pregnant women, and more serious is very likely to induce leukemia, nasopharyngeal cancer, laryngeal cancer, etc., which is so harmful that people smell and change.

If you want to avoid formaldehyde, it is recommended that you do a formaldehyde test for your living environment before moving into a new house to ensure the health and safety of the environment in which you live. Before testing for formaldehyde in a new house, you should pay attention to the following points:

1. Before testing the new house, the doors and windows should be closed for at least 1 hour, and the cabinet doors and drawers of the furniture should be opened to fully volatilize the harmful gases to ensure the accuracy of the indoor air detection value. At present, the national standard value of indoor formaldehyde detection has two sets of standards: the first is to close the doors and windows for 1 hour, and the detection value is qualified; The second is to close the doors and windows for 12 hours, the test value is qualified, relatively speaking, the second standard is more stringent.

2. When testing the formaldehyde of the new house, it is best to carry out it one week after the decoration is completed, and all the new furniture purchased is inside, because only in this way can the data detected by the indoor air be the most accurate.

3. Before testing the new house, clean up the useless paints, coatings, plates and other items in the new house, so as not to affect the detection effect.

Formaldehyde detection box, economical, simple and convenient operation, is also a commonly used detection method. However, this method is inaccurate in the explicit value of the measurement, and there is a certain error, so it can only be used as a reference.

The last way is to find a formal, professional formaldehyde testing agency. The data obtained by professional testing is relatively accurate. At present, formaldehyde detection on the market is generally charged according to the point, and a point is about 150 300 yuan, and the specific ** still needs to be decided according to the local market.

For civil construction projects that use natural ventilation, testing and sampling should be carried out 1 hour after the external doors and windows are closed; In the event of a dispute, the closing time of external doors and windows shall be 1h (hour).

For renovated families who are ready to move in or have moved in, according to the "Indoor Air Quality Standard" GB T18883-2002, the door and window closure time during the detection and sampling: 12 hours (that is, the window closing time when people sleep at night is more than 12 hours, and it will not exceed 20 hours), so the test results of the doors and windows closed for 12 20 hours when air sampling is carried out will be closer to the truth.

Extended information: Do not use chemicals such as air fresheners, perfumes, etc. during the closure process and testing process. During the inspection process, the doors of each room should be closed to each other as much as possible, and no ventilation should be maintained.

During the testing process, the total number of testers and other personnel should not exceed 3, preferably no more than 3 people, so as to minimize the impact of personnel activities on the test.

The time required for door-to-door air sampling: about 25 minutes for each test point, 75 minutes for 3 test points, and 100 minutes for 4 test points.

1. Testing standards: Nowadays, China implements two different formaldehyde testing standards: one is the milligram cubic meter specified in the "old version", and the other is the milligram cubic meter.

Of course, these two tests can be used as testing standards, but usually indoor formaldehyde testing is based on milligram cubic meters.

2. Sealing time: Under normal circumstances, before the formaldehyde detection, it takes at least eight to twelve hours of sealing time. To this end, we should negotiate the time with the formaldehyde testing agency in advance, and the night of the first day can be closed, and the test can be carried out smoothly on the second day, so as not to waste too much time and ensure the progress of the test.

3. Testing items: The detection of indoor pollutants is usually based on formaldehyde, benzene and TVOC, and others also contain toluene, ammonia and other dirt, which can be considered according to the specific situation, and it is best to test them again, so that they can rest assured after moving in. And the data detected by professional testing institutions are relatively accurate, so there is no need to worry about deviations.

When formaldehyde testing, it is necessary to let the staff do a good job of safety protection to avoid harming the staff, and then it is necessary to find a formal formaldehyde testing company to avoid getting inaccurate test results.

Formaldehyde detection is a professional work with high requirements, if it is only a partial understanding, it is best to operate it yourself, otherwise not only can not get accurate test results, may also cause serious consequences. In particular, it is necessary to be extremely careful when handling some dangerous chemicals.

1. The test is best carried out after the decoration is completed and the furniture is inside. In this way, the data coming out of the indoor air is the most accurate.

2. Close the doors and windows for at least 1 hour before the test, and open the furniture door to fully volatilize the harmful gases to ensure the accuracy of the indoor air value.

3. After testing the indoor air, confirm whether the indoor air exceeds the standard according to the data, and whether it is necessary to remove formaldehyde in the new house.

When the data shows that the formaldehyde exceeds the standard, don't be nervous and afraid, the trace amount of excess can be solved by ventilation. If the low magnification exceeds the standard, you can solve it at home, such as buying formaldehyde scavengers, negative ion air purifiers, decoration deodorants, etc. If the high magnification exceeds the standard, professional management is required.

You can find a professional formaldehyde testing company, or use a formaldehyde test box, formaldehyde is a harmful substance produced after our decoration, and it is something we all try our best to remove. Of course, for formaldehyde, you may only know that it is a bad substance, and the specific removal method may not be known. Today, I will answer for you what methods can remove indoor formaldehyde, and I hope it can help you avoid the harm of formaldehyde.

1. Open the doors and windows to circulate the air naturally, and discharge harmful gases to the outside through the air flow, which is simple and effective. Try to keep the windows open for ventilation indoors for a long time, and you can also use electric fans to assist in accelerating indoor and outdoor air convection flow, forced ventilation for a month, and the decoration taste will be greatly reduced. It is best to place the newly purchased furniture at the ventilated outlet, so that the odor is directly excluded outside.

2. Plants can remove formaldehyde, although formaldehyde can be removed, but the amount of formaldehyde absorbed by it is very limited, and when the indoor concentration is high, if the plant simply relies on the adsorption of formaldehyde, its dosage is very large.

3. There are a large number of irregular pores inside the activated carbon, among which the pores similar to the formaldehyde molecule will adsorb formaldehyde, which can achieve the purpose of purifying the air, but the number of internal pores is limited, and it may cause secondary pollution when the adsorption is saturated.

5. The fresh air system is similar to the ventilation method of removing formaldehyde, but there is no need to open the window when in use, and the air delivered to the room is filtered, and it is also used when it exceeds the standard.

There is no most accurate way to detect formaldehyde, because indoor formaldehyde concentration is easy to change with temperature, humidity, illumination, and even room space density, and it is difficult to accurately measure it.

In all common formaldehyde detection, the principle is not complicated: with a certain substance as the medium, when the formaldehyde in the air reacts with the medium, the properties of the medium are checked by observation means to see whether the properties of the medium have changed, how much has changed, and then compared with the existing results, the formaldehyde concentration is clear at a glance. Most of the test methods and instruments differ in the choice of "contact medium".

The photochemical method, represented by the traditional laboratory test, mixes air with reagents to determine the amount of formaldehyde through color changes and light wave changes; The electrochemical method, represented by portable equipment, is to determine the formaldehyde content in the air by the change of electric current through the air.

Both have their advantages and disadvantages: the photochemical method is more stable and less susceptible to interference from other factors, but it takes longer; Although electrochemical methods can produce results in real time, they are highly susceptible to interference and require high sensitivity of the equipment.

Extended Information: Helping to Reduce the Risk of Indoor Formaldehyde Pollution:

1. The best way to remove formaldehyde is to ventilate, open the window no less than twice a day, and each time for no less than 30 minutes.

2. Minimize the number of furniture and reduce the amount of formaldehyde released.

3. Try to choose products with environmental protection marks for decoration, the lower the formaldehyde content, the better, and it is best to do not contain formaldehyde.

4. Put the newly bought furniture for a period of time before use. Furniture or various home decoration materials will reach the highest peak of formaldehyde release within 3 to 5 months after opening the package, and it will enter a slow and small amount of release after half a year.

However, people don't have to worry too much about indoor formaldehyde. The state has gradually imposed stricter and stricter restrictions on formaldehyde inspection and content to ensure that the formaldehyde content in most products is low. As long as the formaldehyde in the air is below a certain concentration, the harm to the human body is negligible.

Answer: It is most effective to find a professional formaldehyde testing company for door-to-door testing. They usually use professional testing equipment to accurately detect the formaldehyde concentration in the air, and if the formaldehyde exceeds the standard, there will be a corresponding treatment plan, but this method is expensive. In addition, there are two effective methods for testing formaldehyde concentrations:

Buy a professional formaldehyde detector by yourself, the cost is high, but the accuracy of the detection data is also high;

The use of formaldehyde detection boxes is affordable and convenient, but the accuracy is limited.

The detection methods include formaldehyde detection box, formaldehyde detector, and now there are many testing units on the market, if you want to save money and rest assured, you can use the test box to test it, and the conventional detection should include formaldehyde, benzene, and TVOC. In addition to formaldehyde is a big deal, it is best not to believe those pineapples, vinegar, etc., it only covers some of the taste, and can not be removed from the root, and the pineapple will rot after a long time, he will also have germs, and at the same time the value of TVOC increases, reducing people's immunity. It is still possible to put some formaldehyde removal materials and photocatalysts, and some photocatalyst wood essential oil can be brushed on the furniture to decompose formaldehyde and prevent formaldehyde from being released into the air, and the effect is very good.

There is also to pay attention to ventilation, ventilate for a period of time in the morning and evening, and close the doors and windows at other times, which is the correct ventilation method.

If you are looking for a formal indoor air testing agency, it is better to be able to issue a CMA qualification report and have a relatively long existence. These two aspects are the most important. The CMA qualification report is the most basic.

If the existence period is relatively long, it shows that the formaldehyde testing agency is strong and capable, and the qualification of testing this industry is not permanently valid, but needs to be reviewed every three years, and the qualification can only be issued after passing the testing and random inspection of each testing index. Moreover, the label of this qualification is found on the official website of each regional quality and technical supervision bureau.

Dear, I am glad to answer for you: what do you need to do in advance to test formaldehyde, the first step: close the doors and windows 12 hours in advance According to national standards, before testing, you need to close the doors and windows for 12 hours in advance, and then test.

Step 2: Check the power and press the power button to turn on and check the power level, if the power is lower than 30%, turn off the instrument for charging for half an hour and then test, otherwise, you can turn off the instrument to prepare for testing. Step 3:

Install the test paper card, take the black protective sleeve on the test paper card, and the round hole with the paper facing the right side, and then insert the paper card into the measuring cell at the bottom of the detector. Step 4: Place the instrument for detection, remove the plug of the air intake, place the instrument in the place where it needs to be detected, be careful not to block the air intake, press the switch to turn on, the machine enters the automatic zeroing, about 3 seconds later, the zero adjustment is completed, press the measurement button to detect, the automatic timing sampling, and the LCD screen displays the countdown time.

It can also be connected to a small space such as a silicone tube detection drawer, and after 10 minutes of sampling, the LCD screen will automatically display the formaldehyde concentration. The national standard value of formaldehyde is lower, more than the standard, due to the different people's sensitivity to formaldehyde, such as pregnant women, children, the elderly, it is recommended to control the formaldehyde concentration below so as not to affect health.

For civil construction projects that use natural ventilation, testing and sampling should be carried out 1 hour after the external doors and windows are closed; In the event of a dispute, the closing time of external doors and windows shall be 1h (hour).