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| Distribution Characteristics and Migration and Transformation Rule of |
| Received:October 22, 2020 Revised:October 29, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.03.027 |
| KeyWord:Ionic rare earth ore; groundwater pollution; |
| Author | Institution |
| FU Hui-ping |
东华理工大学水资源与环境工程学院 |
| CHEN Ren-xiang |
江西省核工业地质局二六四大队 |
| SONG Yong |
江西省核工业地质局二六四大队 |
| WANG Tai-wei |
江西省核工业地质局二六四大队 |
| GAO Bai |
东华理工大学水资源与环境工程学院 |
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| Abstract: |
| Concentration of "three nitrogen" is an important index for groundwater quality evaluation in rare earth mining areas. Analysis of pollution characteristics of "three nitrogen" and revelation of migration and transformation rule are great significance for water environment monitoring and pollution control. Distribution characteristics of "three nitrogen" in groundwater and its migration and transformation rule were discussed through borehole sampling and water quality analysis in Longnan ion-type rare earth mining area. The results show that: 1) rare earth mining area groundwater in Longnan, "three nitrogen" in concentration of unconsolidated rock pore water is slightly greater than that of zone of weathering fissure water, concentration of NH3—N far exceeds the groundwater class Ⅲ water standard, the largest excess multiple is 48.42 times with over standard rate of 31.71%, and NO3—N and NO2—N concentration is low and has no obvious exceed standard. 2) NH3—N migrates along the direction of groundwater runoff with leaching mining area as the center, and the horizontal migration distance is about 3 500 m. Migration rate of "three nitrogen" in pore water of loose rock is higher than that in fissure water of network of weathering zone. The big the permeability of soil is, the fast the migration rate is. 3) Transformation mechanism of "three nitrogen" in groundwater mainly includes nitrification reaction, denitrification reaction, volatilization of NH4+ and self-decomposition reaction of NO2-. An important factor affecting enrichment and mutual transformation of "three nitrogen" in groundwater in mining areas is pH value. |
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