Determination of Cu, Fe, Ni, Pb, and Zn concentrations in coal and respirable coal dust were performed by atomic absorption spectrophotometry. The coal samples of 18 coal mines in Gangneung area were collected and 25 coal mines in Taebaek area. Crushed coal samples were divided into three mesh sizes.
The results were as follows :
1. Metal concentrations of coals in Gangneung area by sieve sizes(-100/+200 mesh, -200/+325 mesh, -325 mesh) were as follows : Cu ; 20, 18, 19, Fe ; 1,830, 1,765, 1,107, Pb ; 6, 8, 14, Ni ; 17, 1.7, 14, Zn ; 4, 2, 4 ㎍/g, respectively. Metal concentrations in coals in Taebaek area by sieve sizes(-100/+200 mesh, -200/ +325 mesh, -325 mesh) were as follows : Cu ; 30, 32, 26, Fe ; 1,741, 1,822, 1,773, Pb ; 8, 9, 7, Ni ; 13, 13, 13, Zn ; 8, 5, 4 ㎍/g, respectively.
There were not significant differences of Cu, Fe, Ni, Pb, and Zn concentrations of coals statistically in Gangneung and Taebaek area by sieve size.
2. Metal concentrations of coals in Gangneung and Taeback area were as follows : Cu ; 19, 30, Fe ; 1,514, 1,778, Pb ; 9, 8, Ni ; 16, 13, Zn ; 3, 6 ㎍/g, respectively.
Differences of copper and zinc concentrations of coal samples were significant between Gangneung and Taebaek area, but those of iron, nickel and lead concentrations were not significant.
3. Copper, iron, lead, nickel and zinc concentrations of coals and respirable coal dust were as follows : Cu ; 30, 6, Fe ; 1,779, 5,075, Pb ; 8, 7,814, Ni ; 13, 5,681, Zn ; 5, 134 ㎍/g, respectively.
Differences of nickel, lead and zinc concentrations were significant between coals and respirable coal dust, but those of copper and iron concentrations were not significant.
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