Which mosquito repellent effect is better, electric mosquito coil or traditional mosquito coil?

In summer, most people will choose traditional mosquito coils or electric mosquito coils. According to reports, traditional mosquito coils are more toxic and should not be used, while electric mosquito coils are less toxic and have a good repellent effect. Is this really the case? This article will introduce you to the principles, advantages and disadvantages of traditional mosquito coils and electric mosquito coils, as well as the methods of identifying toxic mosquito coils.
 

The principle of mosquito repellent incense:
Mosquito coils are the oldest natural medicine to repel mosquitoes. As early as the Southern Song Dynasty, mosquito repellent incense sticks made of Chinese medicine appeared. The effective ingredient in modern mosquito coils is pyrethrin, which has the effect of repelling mosquitoes. After the mosquito coil is ignited, the pyrethrin in the mosquito coil volatilizes along with the smoke and spreads in the indoor air, paralyzing the mosquito's nerves, so the mosquitoes fall to the ground or run away, thus playing the role of repelling mosquitoes.
 
The principle of electric mosquito repellent incense:
Common electric mosquito coils include sheet electric mosquito coils and liquid electric mosquito coils. The mosquito repellent principle of the sheet-type electric mosquito coil is to inhale the insecticide (pyrethrin) into the paper, use the hot air to evaporate the insecticide, so that the liquid medicine reaches the top of the mandrel under the action of the hair gap and volatilizes evenly to achieve mosquito repellent Effect, the general efficacy can be maintained for 6 to 8 hours. The liquid electric mosquito coil is mainly composed of a mosquito repellent liquid and an electronic constant temperature heater. It can evenly evaporate the effective ingredients of the mosquito repellent liquid in the space at a specific temperature, and can be used for a long time. The liquid mosquito coil is mainly composed of a chemical composition called pyrethroids. In addition, some chloroform, Benzene, ether, etc. are used as solvents.
 
We can find that whether it is a traditional mosquito coil or an electric mosquito coil, the active ingredient is pyrethrin. What is pyrethrin? Pyrethrum is a special family of plants in the Compositae family. It is called pyrethrum because its stamens are rich in insecticidal active substances called pyrethrins or pyrethrins, which have significant insecticidal effects. The characteristic of pyrethrin insecticide is that it has neurotoxicity. Once it is contacted by pests, it will quickly embed in the pest’s nervous system and quickly knock down and kill the pests. However, its characteristic will not be harmful to humans and mammals. The nervous system functions, and it does not stay in the mammalian body; it is not easy to develop resistance to drugs, and it is easy to quickly decompose into water and carbon dioxide in the natural environment, without leaving any toxic substances.

Whether it is traditional mosquito coils or electric mosquito coils, as two different ways of repelling mosquitoes, each has its advantages and disadvantages.
Traditional mosquito coil:
Advantage: (1) The insecticide formula of the mosquito coil can be adjusted at will, the mosquitoes are not easy to adapt, and the mosquito repelling effect is good; (2) The insecticide is evenly distributed on the mosquito coil, and gradually heated, the insecticide is evenly dispersed, and the mosquito repelling effect is stable (3) No power supply needed; (4) The price is cheaper.
 
Disadvantages: (1) Fixed use time cannot be guaranteed; (2) There are health-hazardous ingredients in the smoke of wooden mosquito coils, which can pollute the space environment and contaminate objects; (3) Open flames are ignited, potentially causing a fire hazard; (4) Insecticides inside the mosquito coils when ignited Too late to evaporate (especially the disc-type mosquito coils produced by traditional techniques), about 30-40% of the insecticides are decomposed by heat and lose their role in repelling mosquitoes; (5) It requires a lot of equipment investment, the construction of large workshops and the use of large quantities of insecticides. Labor; (6) Consume a lot of precious wood resources.
 
2. Electric heating sheet mosquito coil
Advantages: (1) No smoke, no peculiar smell, no ash, no pollution; (2) PTC heating source, safe and hygienic; (3) The product is easy to transport.
 
Disadvantages: (1) The effect of repelling mosquitoes is unstable. The first 4 hours are better. After 4 hours, the effect of repelling mosquitoes gradually decreases; (2) Insecticide formula cannot be adjusted at will, single insecticide formula is easy to adapt to mosquitoes; (3) Paper long-term Under fixed heating, the decomposition rate of insecticides is high; (4) The used paper still has 20-30% insecticide residues, which loses the effect of repelling mosquitoes, causing waste and polluting the environment.
 
3. Electric heating liquid mosquito coil
Advantages: (1) No smoke, no peculiar smell, no ash, no pollution; (2) Safe to use PTC heating source; (3) Use time as you like, power on when in use, and power off when not in use, it is very convenient to use. One bottle of medicament can be used continuously for about 300h (affected by PCT temperature); (4) It can be produced without mechanical equipment.
 
Disadvantages: (1) Due to the inconsistency of the boiling point and vapor pressure of the ingredients in the medicament, they cannot evaporate simultaneously during heating, causing the core rod to block. Therefore, the evaporation of the medicament gradually decreases with the increase of use time, and the effectiveness of repelling mosquitoes also decreases; (2) The formulation of the medicament cannot be adjusted at will, and the mosquitoes of a single formula are easy to adapt; (3) The decomposition rate of the insecticide is about 30-35% during use. After use, there are 5%-10% insecticidal residues on the mandrel. These losses , All greatly reduce the utilization rate of pesticides, cause waste, and pollute the environment; (4) The solvent is deodorized kerosene, and the medicine bottle is difficult to seal and leaks. Kerosene is dangerous and inconvenient to transport.
 
Through the above comparison, we found that both traditional mosquito coils and electric mosquito coils have their own advantages. So is it true that many people think that electric mosquito coils are much less harmful to the human body than traditional mosquito coils? According to relevant experts, in fact, electric mosquito coils and traditional disc mosquito coils use the same principle of mosquito repellent. They are the same raw materials. The effective ingredients of disc, liquid, and electric mosquito coils are all chemical agents with insecticidal ingredients. The difference is only It is that their carriers are different. Therefore, it is unscientific to say that "smokeless mosquito coils are less harmful than smoked mosquito coils, and electric mosquito coils are less harmful than disc mosquito coils". However, some fake and low-quality mosquito coils contain BHC powder and realgar powder, which can cause chronic poisoning.
 
How to identify toxic and non-toxic mosquito coils?
Regarding how to identify toxic and non-toxic mosquito coils, one can judge from the following aspects:
1. Look at the appearance: The safe mosquito coil has fine processing, uniform color, strong flexural resistance, and the ignition time is about 7-8 hours. Such as
The surface of the fruit mosquito coil is rough, the structure is loose, there are obvious pores, large coals, etc., and it is easy to break, or the ignition time is not reached, and it will be extinguished in the middle, which can be distinguished as a toxic mosquito coil.
2. Smell the fragrance: The pyrethroid mosquito coil has a light fragrance after burning, and will not produce dizziness, pungent and other odors. And the toxic mosquito incense
The smell of burning is strange, often accompanied by the smell of camphor. Smell for a long time will make you dizzy.
3. Distinguish from the ignition point: Ignite the mosquito coil with a match. The pyrethrum mosquito coil has only yellow flames and bluish white smoke, while the toxic mosquito coil
There is a green flame and black smoke when it burns.
4. Distinguish from the mosquito-repellent incense ash: the pyrethrum mosquito-repellent incense ash is white-gray after ignition, while the toxic mosquito-repellent incense ash is black.
5. From the analysis of the mosquito-killing effect: the pyrethrum mosquito coil has obvious toxic effects on mosquitoes after being ignited, and it can inhibit and anesthetize the mosquitoes’ spirits.

After lighting, it is not easy to see mosquitoes flying around; while toxic mosquito coils only excite mosquitoes, mosquitoes fly randomly after lighting, and the efficacy is not as good as pyrethrum mosquito coils.
 
Therefore, whether it is an electric mosquito coil or a traditional mosquito coil, you must read the instructions clearly when you buy it. Whether it indicates the approval number of the National Agricultural Commission and the accurate drug composition and content, it is best to choose natural and safe plant mosquito repellent products. In addition, when purchasing electric mosquito coils, it is best to choose products produced by the same factory as the electric mosquito coils, so that the medicine can be fully volatilized.
 
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