Sample was collected using a standard size selective high volume air sampler (Andersen,SA321A) using a glass fiber (TFAGF810) type filter (22.3 cm. x 25.5 cm.) as the collection medium.
The glass fiber filters have a number of specialties: have higher density than paper filters, able to tolerate a wider temperature range, has high retention capacity for particulate material, and has efficiency to collect 99% of submicron particles as small as 0.3 µm and over (Michael and annunziata,2012). The sampler was calibrated and operated with volumetric air flow rates of 1.13m^3/min for a 24-hr basis . the selection of the sampler was based on several properties such as the ability ot measure the mass concenteation of the particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometer (PM10) in ambient air over a 24-hour period, the ability to measure the total volumetric air flow rates during the sampling period, and it is equipped with a flow control device that is capable of maintaining the sampler’s operating flow rate within the flow rate limits specified for the sampler inlet over normal variations in line voitage and filter pressure drop. these properties makes the sampler fit to attain and maintain the ambient quality standard of thf particulate matter.