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| Effect of Uranium Contents of Paddy Soil and Surface Water on Uranium Contents of Rice in a Uranium Mining Area |
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Received:February 28, 2018
Revised:March 02, 2018
Accepted:March 05, 2018
Published Online:June 15, 2018
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| DOI：doi：10.3969/j.issn.1007-7545.2018.07.016 |
| KeyWord:uranium mining; rice; uranium content; paddy soil; surface water; cause of formation; uranium migration |
| Author | Institution |
| XiangLong |
东华理工大学地球科学学院 |
| LiuPinghui |
东华理工大学地球科学学院 |
| ZHangSHumei |
江西有色地质勘查二队,江西 赣州;江西省有色地质勘查二队,江西 赣州 |
| WeiCHangSHuai |
安徽省地质矿产勘查局326地质队 |
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| Abstract: |
| In order to explore contributing factors for uranium contents in rice of a uranium mining area, distribution of uranium contents in paddy soil profiles, REE characteristics in paddy soils and underlying bedrock, characteristics of uranium contents of paddy soil, surface water, and rice in different reaches of two rivers, and relationship between uranium contents of paddy soils and rice were investigated from perspective of uranium content characteristics in paddy soil and surface water. The results show that uranium contents of paddy soil profiles significantly drop from surface of paddy soil to semi-weathering of granitic bedrock, which means high uranium content in paddy soil is not due to high content of uranium in the soil parent material. The normalized patterns of REE in rocks and paddy soils are basically the same, and are characterized by enrichment of LREE and depletion of HREE, indicating reductive environment of paddy soil with strong adsorption. The average value of uranium contents in surface water, paddy soil and rice from different reaches shows the highest in the midstream, the lower in the downstream, and the lowest in the upstream. The environment of surface water in uranium mining area is in accordance with dynamic conditions of a large amount of equilibrium adsorption of uranium elements in paddy soil, which is beneficial to precipitation and enrichment of uranium in paddy soil in the midstream exploiting mine area. There is a high spatial coupling of uranium content in rice and paddy soil, and a exponential function regression equation with correlation coefficient of 0.749 can be established. All researches confirm the migration path of uranium of first in uranium tailings, then in surface water; the third in paddy soil and at last in rice, which contributes to the characteristics of uranium contents in rice. Thus, uranium content of rice in middlestream area is the highest, followed by downstream area, and the lowest is in upstream area. |
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