Abstract:

Content of nutrients and heavy metals was measured in gangue waste lands with the dumping years from 10 to 50 in Hegang city, Heilongjiang Province, and heavy metal pollution of the study area was analysised using single factor contaminant index and the Nemerow index of pollution. The results showed that the content of nutrients increased in pace with the time of dumping. The average content of hydrolysable nitrogen and total phosphorus in the gangue wastes lands of 10-50 years were 18.0 mg · kg^-1 and 0.13 g · kg^-1, respectively. Both of them were much less than that of the forest lands in the study area, which were 157.9 mg ·kg^-1and 0.473 g ·kg^-1. The content of heavy metal in the gangue waste decreased in pace with the time of dumping. Hg content, ranged from 1.121 mg · kg^-1 to 1.896 mg · kg^-1, exceeded the national secondary standard content. There was also a certain amount of other heavy metals, but they were all lower than the standard. To assess from the polluted degree of the heavy metals, the pollution of gangue waste lands with different dumping years were in light pollution grade.

Key words: gangue wasteland, nutrient, heavy metals, pollution assessment