Contamination of heavy matals in air particulates from the bangkok metropolitan areas and risk assessment of their effects on respiratory system : with speicial emphasison traffic policeman
Abstract:
The research was simed to study the contamination of Pb,Cd and Zn in particulaters with aerdynamic diameter smaller than ten um (PM10), and to estimate the relationship between Pb,Cd and Zn in PM10 with risk to respiratory diseases from heavy metal by comparing with respiratory diseases of traffic policemant and traffic value. The sample used in this study consisted of 132 filters collected from Bangkok Metropolitan areas for Pb, Cd and Zn determination by atomic absorption spectrophotometry. The history of respiratory diseases of traffic policemen was investigated by using a questionnaire.The results of the study showed that the average concentrations of Pb,Cd and Zn in PM10 were found to be 73.22, 1.25 ng/m3 and 15.33 ug/m3 respectively. Pb was found to be 299.33 ng/m3 of highest concentration in Yoawarach Road, Cd was found to be 1.96 ng/m3 of highest concentration in Lanlong Road, while Zn was found to be 30.328 ug/m3 of highest concentration in Suklapiban 1 road. Statistical analysis showed that there was non-significant correlation between Pb, Cd and Zn content in air particulates and risk to respiratory diseases of the traffic policeman. Furthermore, Pb contents in air particulate was found obviously decreased since the campaing of using non-leaded gasoline in 1996.