Concentration of heavy metals (Cr, Zn, Mn, Ni, Pb, Cu) (mg/l) in street sweeps (Fig.
According to the data analyzed, concentration of heavy metals in street sweeps have no direct dependency on transport intensity.
Consequently, concentration of heavy metals in street sweeps depends on the surrounding environment (green zones, surrounding companies and industry, fuel, vehicle repair shops), frequency and time of vehicle stops because of the traffic jams and crossroads, driving speed, number of accidents, frequency of street sweeps works (sweeps export).
Generalized concentrations of heavy metals in street sweeps from different points and in sludge from outflow pipes are given in Table 2.
Average concentration of every heavy metal Pb, Mn, Cr, Zn, Cu, Ni in street sweeps is 2-3 times higher than in sludge from the outflow pipes.
The highest concentrations are those of Mn, Zn, Cu (in street sweep) and Pb (in sludge).
According to the experimental model data, by performing a flame atomic absorption spectrometry method, heavy metal concentration in street sweep, as determined from the sweep out of intensive transportation points in Zirmunai district, directly depends on transport amounts.
"The street sweeps intensified the closer we got to the games," he says.
City officials and members of the Atlanta Committee for the Olympic Games deny that the city has conducted street sweeps and intensified pressure on the homeless leading up to the Games.
