HEAVY METAL IN PM10 IN THE BUILDINGS OF CHIANG MAI PROVINCE DURING SMOG CRISIS
The objective of this research is to study of concentration of heavy metals such as manganese, copper, iron, silver; cadmium, chromium, nickel and lead in particulate matter size smaller than 10 micron (PM10) samples were collected from five building in Chiang Mai province during smog crisis. The PM10 samples were collected by a PM10 low volume air sampler dust with the flow rate 1.7 liter per minute. The sampling time was set 8 hours for each sample according to the sampling from December 2012 to May 2013. The composite elements, i.e., Manganese (Mn) Copper (Cu) Iron (Fe) Silver (Ag) Cadmium (Cd) Chromium (Cr) Nickel (Ni) and lead (Pb) analyzed by Flame Atomic Absorption Spectrophotometer (FAAS). It was found that the indoor dust value of 12.25-171.57 microgram per square meter per day. The most of indoor dust samples were not exceeded the standard value of 150 microgram per cubic meter. The heavy metal concentration were not exceeded the air quality standard value.