Study On The Characteristics Of Concentration And Distirbution Of Heavy Metals Chemical Speciation Of Aerosol In A District Of Changchun

In recent years, fog and haze appear from public sight more and more frequently.Aerosol is the main causes of fog and haze. Changchun continued to experience fogand haze in the2012and the beginning of2013. So aerosol research and analysis isimperative. The aerosol samples were collected with a large flow of aerosol samplerin Kuancheng district of Changchun between12/18/2011and10/20/2012. The articledrew the following conclusions by analysis the concentration distribution of theaerosol samples and the chemical speciation distribution of heavy metals:Among four seasons, the aerosol concentration of winter was highest,198.4μg/m~3,and the lowest in summer,98.8μg/m~3; The annual average of aerosolconcentration is1.88times of the national standard(level1); But all reached the level2national standard.The daily mean of four seasons were all excessive except summer;The aerosol pollution of Changchun have a low level in the domestic, but remained ata high level in comparison with foreign countries.The annual average concentrations of the Cu、Zn、Pb、Cd in the aerosol ofKuancheng district were0.05、0.448、0.108、0.004μg/m~3; The concentrations changetrend of the Cu、Zn、Pb in the aerosol was Obvious and consistent, it is highest inwinter, lowest in summer, spring and autumn approaches. Cd has a low concentrationand its trend of change with seasons was not very obvious. The linear relationshipbetween the concentration of the aerosol and the four metals is very significant, whichshow that a high degree of enrichment of the four metals in the aerosol, Zn and Cdcame from the same source very likely.In various chemical speciation of the four heavy metals, the proportion of soluble(F1) and reducible (F2) were large, which change with the seasons. Thebioavailability of Cd was the biggest, and the Cu, Pb were smaller, which show thatthe Cd had the largest biological toxicity. In various seasons, the other three metalshad their biggest bioavailability in summer except Pb, which show that the three metals were most likely to be absorbed by organism in summer. Pb had its biggestbioavailability in winter.