Bongani Mthembu explains step by step how to take an air quality sample using a bucket monitor.
Taking a Bucket Sample
1. Choose a location
In order to find the right sampling location, you might have to sniff around. Literally. Try to find a location in your vicinity with the strongest odor, this will also most likely be where the chemicals are strongest allowing your bucket sample to be a more accurate reflection of the chemical levels the refineries are emitting.
2. Attach the tedlar bag securely
Insert the nose of the tedlar bag into the bucket port that is opposite to the port used in attaching the air pump. Then loosen the valve attached to the nose of the tedlar bag by about three twists to allow air to flow into the bag.
3. Close the bucket lid completely
In order for the bucket to work, a mini vacuum has to be created using the pump to draw air out of the bucket causing the tedlar bag to inflate. If the lid is open, or the tedlar bag is sticking out, air will continue to flow in leaving this system unable to work. If you have followed all of the steps above and the tedlar bag is still not inflating, it may be due to a leak somewhere else in the bucket. Check out this page for more trouble shooting help.
4. Attach the air pump to the bucket and start pumping
Attach the air pump to the bucket by placing it firmly over the remaining port. Once it is attached you can begin to pump making sure to keep an eye on the bag through the clear window in the bucket. Make sure not to over inflate or the bag will pop.
5. Remove and secure the tedlar bag
Once you have finished inflating the tedlar bag remove the bucket lid and retighten the valve found on the nose of the tedlar bag. If you notice the bag starting to deflate after you have taken the sample you might need to tighten the valve more. Gently remove the nose from the bucket lid port.
6. Store your bucket sample
While you are waiting to submit your sample to a lab, make sure to protect the inflated bag by placing it back into the bucket and closing the lid.