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Effects of phosphorated materials on the concentrations of rare earth elements in soil solution.

JIN Shu-lan1, HU Zhong-jun1, QIU Qiu-ping1, HUANG Yi-zong2*, HU Ying3, CHENG Wei1   

  1. (1Shangrao Normal University, Shangrao 334000, Jiangxi, China; 2 Agro-Environment Protection Institute of the Ministry of Agriculture, Tianjing 300191, China; 3Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China).
  • Online:2018-06-10 Published:2018-06-10

Abstract: Mining of rare earth minerals can cause serious rare earth pollution to the soils. In this study, four types of phosphorated materials (superphosphate, phosphate rock, bone charcoal and monocalcium phosphate) were added into two types of soil polluted by rare earth in Xunwu and Longnan counties of Jiangxi Province, respectively, to examine their influences on the concentrations of rare earth elements (REE) in soil solution. Results showed that the addition of phosphorated materials significantly decreased the concentrations of 15 types of REE in soil solution, with the amplitude of reduction between 20.8% and 99.2%. The order of the reduction percentage of different types of REE was as follows: light REE of La, Ce, Pr, Nd and Sm > middle REE of Eu, Gd, Tb, Dy > heavy REE of Y, Ho, Er, Tm, Yb and Lu. Adding 2.5%-5% of superphosphate, phosphate rock, bone charcoal and monocalcium phosphate decreased REE concentration by 55.3%-99.2%, 86.8%-99.1%, 80.7%-99.3% and 9.8%-96.2% respectively. These results suggested that application of phosphorated materials could remediate the rare earth polluted soils and reduce the pollution of REE.

Key words: MaxEnt model, presence-absence threshold, model complexity, model., sampling bias