Research Article (Funded Research)
Assessment of Heavy-Metal Contamination of Floodplain Soils due to Mining and Mineral Processing in CN Iron Mine, NE Iran
Amin Razmara, Rahim Dabiri*, Habib Mollai
Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
This study investigates the level of soil contamination by heavy metals according to geochemical indicators, statistics and environmental data from mining and processing of CN iron mine. Based on statistical analyzes the origin of arsenic, zinc, manganese, titanium, copper, cadmium and sulfur as a result of lithogenic activities and the origin of aluminum, lead, and iron elements are anthropogenic. The enrichment factor showed that arsenic had a strong enrichment and sulfur had extremely intense enrichment in this region. The contamination factor indicates that arsenic, copper, cadmium, and iron have significant contamination and the sulfur element has a high pollution rate of 11.84. In the land index, the accumulation of arsenic, cadmium, and sulfur has caused moderate pollution in this region. Sulfur with the coefficient of 1.83 has the highest contamination among the elements. The zoning map showed that arsenic and sulfur at the Tailing dam and the concentrate plant had the highest concentration and contamination. This indicates the direct effect of anthropogenic effects on soil contamination in the study area. The assessment of the Contamination degree showed that soil contamination in the south and south-east of the study area (Dump site and Tailing dam) has the highest rate. The amount of Pollution Load Index (PLI) in soil samples of the study area was higher than the coefficient 1 and showed the soil contamination.
Key words: Mining, Mineral processing, Iron mine, Soil contamination, Iran.