The background concentration of rare earth element and its impact factor in soil of Shenzhen City
XI Xiu-ping1,2, ZHAO Shu-hua1,2, YANG Kun1,2, ZHAO Yan1,2, LIAO Man1,2, WU Jing-ya1,2, LI Ting1,2, LUO Fei1,2
1. Shenzhen Academy of Environmental Science, Shenzhen 518001, China; 2. State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology, Shenzhen 518001, China
Abstract：For the purpose of studying the environmental background concentration and spatial distribution characteristics of rare earth element in soil of Shenzhen, 450 soil surface sample sites and 50 typical soil depth profile sample sites were selected in the scope of basic ecological control line which was not or little affects by the human being. 500 top soil samples and 100 sectional samples were collected by unit-multi increment sampling method. The results showed that the range of the environmental background concentrations of REE in topsoil of Shenzhen was 23.66~1246.26mg/kg, the arithmetic average value was 285.99mg/kg, which was higher than that in soil of China and Guangdong province. The top soil of Shenzhen was enriched-type of light rare earth element, and the spatial distribution patterns of concentration of REE was high the west and low in the east. The sequence of 95% fraction value of REE concentration in different soil types was lateritic red soil > red soil > yellow soil. The order of 95% fraction value of REE concentration in different parent rocks was metamorphic rock > granite > gneiss > tuff lava > gravel shale > grey limestone. The order of 95% fraction value of REE concentration in different levels of soil profiles was under layer > middle layer > surface layer. The REE background concentration raised with the increase of soil depth, which showed a characteristic of accumulation on the bottom. The parent rocks was probably the first influential factor of REE background concentrations in soil, as which was remarkable higher in soil developed by granite than that by gravel shale. Different soil types also might affect the soil REE background concentration. The REE background concentration was higher in lateritic red soil than in red soil, which were derived from the identical parent rock. Canonical correlation analysis showed a significantly positive correlativity was found between Fe, Al and light rare earth element as well as between Mn and heavy rare earth element, while the correlativity between soil pH as well as clay particle and soil REE background concentration was weak. The result was also indicated the inheritance of soil REE from parent rock.
郗秀平, 赵述华, 杨坤, 赵妍, 廖曼, 吴静雅, 林挺, 罗飞. 深圳土壤稀土元素的背景含量和影响因素研究[J]. 中国环境科学, 2021, 41(5): 2362-2373.
XI Xiu-ping, ZHAO Shu-hua, YANG Kun, ZHAO Yan, LIAO Man, WU Jing-ya, LI Ting, LUO Fei. The background concentration of rare earth element and its impact factor in soil of Shenzhen City. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2362-2373.
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