بررسي نحوه پراكنش ذرات سرب در هواي شهر همدان از آذرماه 76 تا خرداد ماه 77

Evaluation the Distribution of Lead Particulate in Ambient Air of Hamadan from December 1997 to June 1998

To determine the distribution of lead in ambient air of Hamadan, 100 samples were taken in different places from December 1997 until June 1998. The places of samples collection , were divided to three locations in street (high traffic, medium traffic and low traffic), gas pump stations and parking of cars. Portable sampling pump and filter cellulose were used to obtain samples. The samples transferred to laboratory and analyzed with atomic absorption spectrophtometry. The results showed the concentration of lead was 1 µg/m3 in low traffic and 18 4g/m3 in high traffic places. The average concentration of lead in high traffic, medium traffic and low traffic were 7.99 , 4.63, 3.80 µg/m^3 respectively and have significant difference among concentration of lead in low traffic places with gas stations and parking of cars. The average concentrations of lead in ambient air of Hamadan was more than the standard limit (1.5 µg/m^3) in ambient air recommended by World Health Organization (WHO), and United States Environment Protection Agency (USEPA).