|Table of Contents|

Characteristics and Environmental Significance of Heavy Metal Elements from Soil and River Bed Sediments in Duobuza Copper Mining Area, Tibet, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第03期
Page:
376-393
Research Field:
水资源与环境
Publishing date:

Info

Title:
Characteristics and Environmental Significance of Heavy Metal Elements from Soil and River Bed Sediments in Duobuza Copper Mining Area, Tibet, China
Author(s):
CHEN Zhen-yu1; 2;  WANG Song1; 2;  ZHAO Yuan-yi2*
(1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China)
Keywords:
Key words:heavy metal element;  soil;  sediment;  speciation analysis;  geoaccmulation index;  comprehensive pollution index;  biological activity;  Tibet
PACS:
P618.41; X53
DOI:
10.19814/j.jese.2020.03037
Abstract:
Duobuza copper deposit in Tibet is a large porphyry type of gold-rich copper deposit, and the proven amount of copper resource is more than 400×104 t. At present, it has not been exploited, and the researches mainly focus on prospecting and geological mineralization, and little environmental research has been done. In order to understand the enrichment and migration characteristics of heavy metal elements in mining area before the development of Duobuza copper deposit, the surface soil and sediment of Samalong river bed in Duobuza copper mining area were collected, the contents and speciations of seven heavy metal elements, including Cu, Pb, Zn, As, Cd, Cr, Hg, were tested; meanwhile, geoaccmulation index method, comprehensive pollution index method and risk assessment code(RAC)method were used to evaluate the enrichment degree and biological activity of heavy metal elements in mining area. The results show that the distributions of most heavy metal elements in surface soil and sediment of Samalong river bed are greatly affected by Duobuza copper deposit, and there is a significant correlation between them. The content of Cu in surface soil of Duobuza copper mining area is especially rich, reaching 21 020.000×10-6, which is 50 times higher than the level Ⅲ standard in environmental quality standard for soil(GB 15618—1995); the comprehensive pollution index is 39.43, which reaches the heavy pollution level, the geoaccmulation indexes of most samples also reach the very strong pollution level, and the biological activity reaches a moderate risk level, and is easy to migrate and transform, which has a great impact on the environment. The maximum content of Cu in sediment of Samalong river bed is 2 406.000×10-6, which is 6 times of the level Ⅲ environmental quality standard for soil; the comprehensive pollution index is 38.13, the geoaccmulation index also reaches 91.6%, while it mainly exists in a more stable residual state(accounting for 42.83%), and RAC value is a low risk level, the migration ability is relatively weak, which has little impact on the environment, but the risk cannot be ignored; the content of Cd is not high, which is lower than the level Ⅲ environmental quality standard for soil, but it mainly exists in the carbonate bond state in river bed sediment(accounting for 48.01%), and the biological activity reaches an extremely high risk level, which has a relative great impact on the environment. The contents of Pb, Zn, As, Cr, Hg is generally low, and the biological activity is weak, which can exist stably in the soil, will not affect the environment basically.

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Last Update: 2020-05-27