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Problems and progress of negative oxygen ion monitor in monitoring

by:Rika Sensors     2021-12-11
Problems and progress of negative oxygen ion monitor in monitoring
In nature, forests and wetlands are important places for the generation of negative oxygen ions in the air. The tip discharge of the leaves and branches of plants and the photosynthesis of green plants form a photoelectric effect, and then generate negative oxygen ions. The negative oxygen ions in the air are known as 'air vitaminsAccording to related reports, the concentration of negative (oxygen) ions in fresh air is generally defined as not less than 500/cm3.

There are problems in environmental anion monitoring research

Although the country has explicit requirements on the concentration of negative oxygen ions, the topic of whether negative oxygen ions are beneficial to the human body has been controversial in scientific research. Some scholars pointed out Negative air ions (negative oxygen ions) have a positive effect on human health, but there is no scientific evidence to prove it.

Most of the research and monitoring of negative oxygen ions stay on the level of scientific research. Most cases of monitoring research are carried out in my country. There are relatively few cases of monitoring research abroad. It is harmless, but whether it is beneficial to the human body remains to be confirmed.

Current status of the application of negative oxygen ion monitoring equipment

There is no unified specification of equipment parameter indicators for negative oxygen ion monitors in the domestic market. The National Standard for General Specifications for Air Ion Measuring Instruments (GB/T 18809 2002) was formulated in 2002. ) The requirements for the working environment of the monitoring equipment are too low, and the air temperature and humidity have become one of the bottlenecks restricting the normal operation of the monitoring equipment, and the monitoring results are also unconvincing.

Because of the lack of research on negative oxygen ions abroad, only Japan COM company is the more famous monitoring equipment manufacturer in the market. According to the company’s distributor, this monitoring equipment is suitable for indoor use and is not suitable for working in rainy and high humidity environments.

At present, in addition to monitoring for scientific research purposes, a small number of scenic spots and scenic spots in China have carried out air negative (oxygen) ion monitoring in order to attract tourists with the sign of 'natural oxygen bar'. There are tens of thousands of negative air (oxygen) ions, and the monitoring results are generally high.

The progress of air negative oxygen ion monitoring in my country

1. Plant community model

Under short-wave ultraviolet radiation, the oxygen released by photosynthesis of plants is prone to photoelectric effect, forming oxygen negative ions, thereby improving The level of negative ions in the air in a small area. The concentration of negative air ions in areas covered by green vegetation is much higher than in other areas. Different vegetation types and plant communities, different forest ages and canopy closures have very different effects on the concentration of negative air ions.

2. Environmental Meteorological Factors

There are many reports on the correlation between air anion concentration and meteorological factors. It is generally believed that air anion concentration is positively correlated with humidity and negatively correlated with temperature, and the influence of wind speed on air anion concentration exists Dispute. The presence of water has a great influence on the concentration of negative ions, such as waterfalls, fountains, coastal areas and after thunderstorms, the content of negative ions in the air will be significantly increased. In addition, suspended solids in the air, carbon dioxide, sulfur dioxide, and nitrogen oxides are significantly negatively correlated with air ions.

3. Seasonal dynamics and day-night dynamics

The changes in air anion concentration have significant seasonal and daily dynamics. Under normal circumstances, the seasonal dynamics of air anion concentration are the highest in summer, followed by spring and autumn, and the lowest in winter; while the daily dynamic performance is that the average air anion concentration during the day is higher than the night average, the highest from early morning to morning, the second from noon to afternoon, and the evening anion The concentration has risen to a certain extent, and the concentration of negative ions in the air at night is the lowest

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