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초록

The main processes in vehicles that add heavy metals(Pb, Zn, Cu, Cd and Ni) and
TPH into the environment are fuel combustion, wear and tear of cars(tires, brakes,
engine), oil leaks and corrosion. As these factors pollute roadside soils, a correlation
between traffic volume and heavy metal accumulation in the soil would be expected.
This study aimed at understanding the pattern of heavy metal and TPH accumulation in
the soils along major highways in Seoul. Roadside soils along Gyeongbu, Olympic,
Dongbu, Gangbuk-Riverside, Gyeongin, Nambu and Seobu highways, which are the main
roads in Seoul, were investigated. Roadside soils were collected at three points, while
background soils were placed in acrylic boxes and set up in both directions along each
highway. The background soil samples in the acrylic box, which were separated by
depth(upper layer, mixed layer), were collected from the roadside every three months.
Heavy metals were analyzed based on total content, while the degree of pollution along
each highway was estimated using the pollution index(PI). The total content of heavy
metals on the Seobu highway was the highest, although it did not exceed the standard
for pollution(3rd region). Metal concentrations were the highest for Cu, Pb, Ni and Cr+6
along the Seobu highway and for As and Cd along the Gyeongbu expressway. The
order of TPH concentration was Nambu > Seobu > Gyeongbu, which corresponded to
the traffic volume and vehicle speed. Heavy metals(Cu, Pb, As, Zn, Ni) tended to
decrease in the roadside soils as the soil depth increased. The pollution index along the
highways was in the following order: Seobu > Nambu > Gangbuk-Riverside > Gyeongin
> Gyeongbu > Dongbu > Olympic.
The main processes in vehicles that add heavy metals(Pb, Zn, Cu, Cd and Ni) and
TPH into the environment are fuel combustion, wear and tear of cars(tires, brakes,
engine), oil leaks and corrosion. As these factors pollute roadside soils, a correlation
between traffic volume and heavy metal accumulation in the soil would be expected.
This study aimed at understanding the pattern of heavy metal and TPH accumulation in
the soils along major highways in Seoul. Roadside soils along Gyeongbu, Olympic,
Dongbu, Gangbuk-Riverside, Gyeongin, Nambu and Seobu highways, which are the main
roads in Seoul, were investigated. Roadside soils were collected at three points, while
background soils were placed in acrylic boxes and set up in both directions along each
highway. The background soil samples in the acrylic box, which were separated by
depth(upper layer, mixed layer), were collected from the roadside every three months.
Heavy metals were analyzed based on total content, while the degree of pollution along
each highway was estimated using the pollution index(PI). The total content of heavy
metals on the Seobu highway was the highest, although it did not exceed the standard
for pollution(3rd region). Metal concentrations were the highest for Cu, Pb, Ni and Cr+6
along the Seobu highway and for As and Cd along the Gyeongbu expressway. The
order of TPH concentration was Nambu > Seobu > Gyeongbu, which corresponded to
the traffic volume and vehicle speed. Heavy metals(Cu, Pb, As, Zn, Ni) tended to
decrease in the roadside soils as the soil depth increased. The pollution index along the
highways was in the following order: Seobu > Nambu > Gangbuk-Riverside > Gyeongin
> Gyeongbu > Dongbu > Olympic.