Project Introduction

Formaldehyde testing refers to the quantitative testing of formaldehyde for automotive interior materials, home materials, construction materials, paints, inks, spices, and other product materials through specific methods or instruments. Formaldehyde has a strong stimulating effect on human skin, causing skin eczema and systemic allergies. The World Health Organization has identified formaldehyde as a class of carcinogens.

The new car has many ornaments, mixed with leather, paint, plastic, rubber, adhesive, etc. If the formaldehyde content in the car exceeds the standard, it will cause throat discomfort, coughing, dry eyes, watery eyes, dizziness, and headache.

Meaning and purpose

Automobile interior textiles are mainly used for interior seat fabrics, headrests, door interior trim panels, carpets, canopies and instrument panel lid fabrics, etc. It is a technical fabric that integrates decoration and functionality, and its raw materials The choice and decoration design directly affect the comfort, beauty, safety and environmental protection of the car.

In recent years, the rapid development of China's auto industry has promoted the localization of auto parts, and also driven the development of domestic automotive interior textiles. Automobile interior textile fabrics include imitation leather, plain weave, velvet and other varieties, as well as pure textiles and composite materials to meet people's various needs. The poisonous gas released by the interior decoration materials of the car is very harmful to people. These toxic substances mainly include benzene, xylene and formaldehyde. Therefore, for people's health, safety and environmental protection, detecting toxic gases and limiting them to a certain range has become a very important task in our country.

Formaldehyde hazards

The health hazards of formaldehyde mainly include the following aspects:

1. Irritation to the skin and mucous membranes. Formaldehyde is a toxic substance of puree, which can be combined with protein. When inhaled at high concentration, severe irritation and edema of the respiratory tract, eye irritation, and headache may occur.

2. Sensitization: Direct skin contact with formaldehyde can cause allergic dermatitis, stains, and necrosis. Inhalation of high concentrations of formaldehyde can induce bronchial asthma.

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

5. In addition to formaldehyde from plant sources, plant-derived air purification sprays atomized terpenoid compounds, which have a wide range of biological activities, but traditional production methods that rely on plants are one of the bottlenecks for popularization and application. Using synthetic biology strategies to create microbial "cell factories" is expected to provide advanced technology for low-cost, sustainable supply of plant-derived terpenoids. Tanshinone is the main fat-soluble active ingredient of the traditional Chinese medicine Salvia miltiorrhiza in my country, which belongs to the rosinane class of norditerpene compounds. The research team cooperated with the research group of Huang Luqi, a researcher of the Chinese Medicine Resource Center of the Chinese Academy of Medical Sciences, to construct a yeast engineering strain for synthesizing the precursor tanshinone diene with high yield of tanshinone (J.Am.Chem. Soc.,2012,134(6):3234) .

Chronic effects of formaldehyde poisoning

Long-term exposure to low-concentration formaldehyde vapor may cause headaches, weakness, and other symptoms. Abroad reported that 14% to 16% of workers experienced digestive disorders, excitement, tremor, and visual impairment after exposure to formaldehyde. In the workshop where the concentration of formaldehyde reaches 0.2-0.7mg/m3, workers who work for a long time may experience loss of appetite, weight loss, fatigue, headache, palpitations and insomnia. It has been reported that formaldehyde can also cause tactile, painful, and temperature disturbances (feeling hypersensitivity is most common, often limited to one side or some parts of the body), one side of the body (often the right side) sweats too much, and both sides of the body The skin temperature varies. Workers exposed to low-concentration formaldehyde for a long time have a significantly higher proportion of eye and throat irritation symptoms and chest pressure than the control group, and lung function can be affected. Some workers may experience dizziness, headache, fatigue, drowsiness, loss of appetite, weight loss, vision loss, etc., but no confirmed cases of chronic poisoning have been reported. Some studies suggest that individuals or populations exposed to formaldehyde have increased tumors in the nasal cavity or nasopharynx. IARC (1995) listed formaldehyde as a possible carcinogen in humans (nasopharynx) (Group 2A).

The main performances are:

Formaldehyde lurking around

Formaldehyde lurking around

1. When getting up early in the morning, I feel sullen, nausea, and even dizzy;

2. Someone in the family often catch a cold;

3. Although he does not smoke, he often feels uncomfortable, has a foreign body sensation, and has difficulty breathing;

4. Children at home often cough, sneeze and have weakened immunity;

5. The family members often have allergies and other diseases, and they are group-like;

6. The family has a disease, and after leaving this environment, the symptoms have significantly changed and improved;

7. Newly-married couples are infertile for a long time, but no reason can be found;

8. Pregnant women discover fetal malformation under normal pregnancy;

9. In newly moved or newly renovated houses, indoor plants are not easy to survive, and the leaves are easy to yellow and wither;

10. After the new move, domestic cats, dogs and even tropical fish died inexplicably;

11. When I go to work, I feel a sore throat and dry my respiratory tract. After get off work, I will be fine; (formaldehyde in the office exceeds the standard)

12. Newly renovated homes and office rooms or new buyers have irritating odors such as pungent and dazzling odors, and the odors will not dissipate for a long time.

Detection method

1. AHMT spectrophotometry

2. Acetylacetone method

3. Color-changing acid method (CTA method)

3. Color-changing acid method (CTA method)

4. Phenol reagent method

5. By-product magenta method (PRA)

6. AHMT method

7. Potassium bromate-methine blue method

8. Silver-Ferrozine method