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| 珠三角新会地区表层土壤硒、氟、碘地球化学特征研究 |
| Geochemical Characteristics of Selenium, Fluorine and Iodine in Surface Soils of the Xinhui Area, the Pearl River Delta, China |
| 投稿时间：2019-01-10 修订日期：2019-10-27 |
| DOI：10.14050/j.cnki.1672-9250.2020.01.021 |
| 中文关键词: 硒;氟;碘;地球化学;新会 |
| 英文关键词: Selenium;Iodine;Fluorine;geochemistry;Xinhui area |
| 基金项目:中国地质调查局项目（121201108000150012-03）。 |
| 作者 | 单位 | E-mail | | 杨笑笑1,2, 曾道明2,3, 罗先熔1, 孙彬彬2,3, 吴超2,3, 黄文斌1, 杨春丽1 | 1. 桂林理工大学 地球科学学院, 广西 桂林 541004
2. 中国地质科学院 廊坊物化探研究所, 河北 廊坊 065000
3. 国土资源部 地球化学勘查技术重点实验室, 河北 廊坊 065000 | 55136891@qq.com |
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| 中文摘要: |
| 以珠江三角洲新会地区西江、潭江下游的三江、睦州、古井三镇土壤为主要研究对象，测试分析所采集的1 567件表层土壤样品全氮（N）、有机碳（Org.C）、pH等理化指标和二氧化硅（SiO2）、三氧化二铝（Al2O3）、硒（Se）、氟（F）、碘（I）5种元素组分含量，以及60件稻谷样的硒（Se）含量。重点探讨了研究区Se、F、I的含量、分布及其影响因素等地球化学特征。结果表明，研究区土壤呈现强酸性-酸性，Se、F、I的含量均值分别为0.50 mg/kg、617.39 mg/kg、3.57 mg/kg，Se、F高于全国土壤背景值，I低于全国土壤背景值；Se、F、I均与Al2O3、Org.C以及pH相关，F与Se不相关，F与I负相关。Se、F、I的含量、分布等地球化学特征受地层控制：不同成土母质中，基岩区和花岗岩区Se、I含量较高；第四纪沉积区F含量较高。推测Se和I主要源于燕山期的火山活动，F主要源于三角洲的沉积作用。总体上研究区土壤呈现足硒、富硒，碘适量，氟过剩的特征，稻谷富硒率也高，具备开发天然富硒农产品的条件。 |
| 英文摘要: |
| Taking soils of Sanjiang, Muzhou and Gujing towns in the Xinhui area of the Pearl River Delta as the main research objects, the physical and chemical parameters, including contents of total nitrogen (N), organic carbon (OC), pH, silicon dioxide (SiO2), aluminum trioxide (Al2O3), selenium (Se), fluorine (F), iodine (I) and selenium (Se), of 1 567 surface soil samples and Se contents in 60 rice samples were determined. The contents, distributions and key control factors of Se, I and F in this area were discussed. The results showed that average contents of Se, F and I in the study area were 0.50 mg/kg, 617.39 mg/kg and 3.57 mg/kg, respectively, and average contents of Se and F were higher than their national soil background values, the average content of I was lower than the national soil background value. Contents of Se, F and I correlated consistently with Al2O3, OC and pH, meanwhile contents of F showed no significant correlation with contents of Se, but contents of F showed a negatively correlation with contents of I. The geochemical characteristics, such as, content distributions of Se, F and I, were obviously controlled by strata of different parent materials, for example, contents of Se and I were higher in bedrock and granite areas and contents of F in quaternary sedimentary areas were higher, indicating that Se and I mainly derived from Yanshanian volcanic activities and F mainly derived from the delta deposition. In summary, soils of the study area could be characterized by abundant selenium, adequate amount of iodine, and excess fluorine. The enrichment of selenium in rice samples suggested the prospect of developing natural selenium-rich agricultural products. |
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