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Abstract
Contents of metal elements in soil covered lead-zinc tailing mine should be determined after long-term exposured with tailing ores, results should be compared with the requirements of metal contents in National Standards in order to measure the the application level of land. The investigation of this paper chose the representative soil samples of different altitude from multiple soil samples collected from the soil covered lead-zinc tailings mine mount in Cheng County, Longnan City, Gansu Province in China. XRF analysis was used to determine the kind and content of metal elements of the soil sample. The data were compared to make sure the changes of metal elements contents of soil samples with the altitude. The result found that the maximum content of Fe in each sample, and the content of Fe is quite different of the content of other metal elements in samples, while the samples had relatively low contents of Pb and Zn. Content of Cu in soil samples is lower than the Risk Screening Value of Soil Pollution in Construction Land, while contents of Pb and Cr were higher than that in Risk Screening Value of Soil Pollution in Construction Land.
Highlights
Longnan City was located in southeastern part of Gansu Province in China, and its geographical latitude and longitude coordinates were between N 32°38' ~ 34°31' and E 104°1' ~ 106°35'
2.1 Method for collecting soil samples The lead-zinc tailings mine area in Chengxian County, Longnan City, where the soil samples were collected was built along the mountside, the spatial construction of tailings mine was laminated like terrace, with stripstepped cross section
While contents of some metal in some soil samples were not determined by X-ray fluorescence (XRF) detector, only Ag was measured in Sample 7, Hg was measured in Sample 3, Cd and Au were measured in Sample 8
Summary
Longnan City was located in southeastern part of Gansu Province in China, and its geographical latitude and longitude coordinates were between N 32°38' ~ 34°31' and E 104°1' ~ 106°35'. Longnan City was the exclusive Changjiang River basin region in Gansu Province, the only subtropical humid climate zone [1]. The precipitation was closely related to local topography, the terrain change and hydrothermal distribution had great influence on production and living. It was rich in water, biological and mineral resources [2]. Soil samples investigated in this paper were collected from the soil covered lead-zinc tailings mine mount of altitude from the top to bottom of 1074 – 1248 m in Anfanggou Ditch of Chengxian County in Longnan City, Gansu Province, China. Contents of heavy metal in soil were affected by the eluviation and efflorescence during soil-forming process, and influenced by plant absorption, enrichment, naturalization and other factors. Various human activities impacted metal contents in soil of different functional areas as well
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