The air microbiological sampler simulates the anatomical structure and aerodynamic characteristics of the human respiratory tract. Utilizing the inertial impaction principle, particles suspended in the air are collected at different horizontal surfaces according to their equivalent aerodynamic diameter. Radiological analysis is employed to evaluate the extent of harm to human health caused by environmental aerosols. What are the site requirements for an air microbiological sampler?
1. Open and lock the tripod, adjust the top of the tripod to a level position, place the impact device on the round plate of the tripod, and set the main unit on a table or floor.
2. Arrange the sample tray neatly, use one hand to open the lid, and with the other hand, quickly cover the impact plate. Then, press the top of the impact plate and hang three spring hooks.
3. Sampling time should be related to the level of air pollution, but it should not exceed 30 minutes. Prolonged air flow impact can dehydrate the sampling medium, affecting microbial growth.
4. To maintain accuracy in colony counting, it is recommended that no more than 250 colonies be present per culture dish. Typically, this takes 10 minutes in outdoor air conditions and 1-5 minutes in indoor air conditions.
After collecting samples with the air microbiological sampler, remove the samples and securely close the lids, ensuring the correct order and numbering is maintained.
The principles for air microorganism sampler sampling points include: sampling points should be located at three different positions of high, medium, and low pollution concentrations within the monitoring area; sampling points should be in open areas; the windward direction point of the sampling point should be 1.5 meters away from the pedestrian walkway. The setting conditions should be as unified or standardized as possible, and the sampling height should be determined based on the sampling purpose.
1. The Functional Layout Method is primarily used for routine environmental monitoring in areas, and air microbial samplers are suitable for industrial, commercial, residential, and densely populated traffic zones.
2. The grid-point method has multiple sources, and the inner-source distribution of the air microbial sampler's housing is relatively uniform.
3. The concentric circle distribution method is primarily applicable to areas where major pollution sources are concentrated and different pollution sources form pollution clusters.
4. The air microbiological sampler is arranged in a fan shape, suitable for isolated elevated point sources and areas with distinct wind directions.
News Center Co., Ltd.
