Air sampling by manual method

Manual air sampling is a technique for collecting air samples that involves direct human intervention in the collection process. Unlike continuous sampling or other automated methods, manual sampling involves individuals personally collecting air samples at specific times and according to defined protocols.

Here's how manual air sampling typically works:

Location and timing selection : Those responsible for sampling choose locations where air samples will be collected based on study objectives, potentially contaminated areas, or points of interest. They also decide the exact time of collection taking into account factors such as weather conditions, surrounding activities and peak times.

Preparation of equipment : Manual samplers use specific equipment such as air pumps, absorbent cartridges, particle filters, etc., depending on the substances to be sampled. They check that the equipment is in good working order and properly calibrated before collection.

Sample Collection : Samplers follow specific protocols to collect air samples. This may involve exposing sampling devices to ambient air for a specific period of time, typically using pumps to control airflow or taking samples passively using tubing or filters.

Labeling and Storage : Once samples are collected, they are appropriately labeled with date, time, location, and other pertinent information. The samples are then stored according to the preservation requirements until transport to the laboratory for analysis.

Laboratory analysis : The collected samples are then transported to the laboratory where they are analyzed to determine the chemical composition, the levels of contaminants, the presence of pollutants, etc.

Manual air sampling is often used in specific contexts where human intervention is required to ensure accurate sample collection, such as when investigating specific pollutants, responding to events environmental or to verify regulatory compliance. However, this method may be more prone to human error and less suitable for continuously monitoring short-term variations in air quality.