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不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响

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营浩, 张显晨, 郜红建. 不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响[J]. 环境化学, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
引用本文: 营浩, 张显晨, 郜红建. 不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响[J]. 环境化学, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
shu
YING Hao, ZHANG Xianchen, GAO Hongjian. Variation of fluoride composition in tea garden soil leachate under citric acid of different pH[J]. Environmental Chemistry, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
Citation: YING Hao, ZHANG Xianchen, GAO Hongjian. Variation of fluoride composition in tea garden soil leachate under citric acid of different pH[J]. Environmental Chemistry, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
shu

不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响

  • 1.

    安徽农业大学资源与环境学院, 合肥, 230036;

  • 2.

    安徽农业大学茶叶生物化学与生物技术教育部重点实验室, 合肥, 230036

  • 基金项目:

    国家自然科学基金(31272254)

    安徽省杰出青年科学基金(1408085J01)资助.

Variation of fluoride composition in tea garden soil leachate under citric acid of different pH

  • 1.

    School of Resources and Environment, Anhui Agricultural University, Hefei, 230036, China;

  • 2.

    Key laboratory of Tea Biochemical and Biological Technology, Ministry of Education, Anhui Agricultural University, Hefei, 230036, China

  • Fund Project:

  • 摘要: 通过连续流动搅拌法,研究了不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响.结果表明,土壤溶出液的pH随溶出时间的延长而逐渐减小.土壤溶出液中的游离态氟和总氟的浓度随时间的延长和柠檬酸pH的升高而逐渐减小,且呈现初始(0-6 h)溶出浓度较高,而后(6-10 h)逐渐减缓的趋势.土壤氟的溶出过程用一级动力学方程、Elovich方程、扩散方程和双常数方程均有较好的拟合,决定系数(R2)均大于0.90.低pH(pH 3.5)条件下,F主要以H-F形态存在,随着pH的升高(pH 4.0-5.0),H-F形态的氟减小,Al-F络合态的氟增多,且随时间延长,溶出浓度均降低.反应开始的前1 h,Al-F络合物主要以AlF3为主,占氟溶出总量的90%以上;至7 h时,AlF2+的溶出量逐渐增大,并逐渐超过AlF3.低pH的柠檬酸促进土壤游离态氟和总氟的溶出,有利于络合态氟的形成,但对Al-F络合物的形态转化没有显著影响.
    Abstract: Variation of fluoride (F) composition in tea garden soil leachate under citric acid of different pH was studied by using the flow-stirred method. Results showed that soil solution pH decreased with the increase of reaction time. The amount of free F and total F released into soil solution increased with citric acid pH and reaction time. Moreover, the release of F from soil was initially fast and then slowed down. The concentration of F released into soil solution from 0 to 6 h was higher than from 6 to 10 h.The released of F from tea garden soil fitted the first-order reaction kinetics equation, Elovich equation, diffusion equation and double constant equation well, and the coefficient of determination (R2)were higher than 0.90.At low pH, H-F was the main form of F. The amount of Al-F complexes, released into soil solution increased, while the amount of H-F complexes released into soil solution decreased with citric acid pH. Amount of Al-F complexes and H-F complexes, decreased with the increase of reaction time. During the first 1 hour, AlF3 was the main form of Al-F complexes, accounting for 90% of the total F released from the tea garden soil. In addition, with the increase of reaction time, the amount of AlF2+ released from the tea garden soil increased and was higher than that of AlF3 after 7 hours. At low pH, citric acid promoted release of F from soil and facilitated formation of F-complexes, while it had no significant impacts on the transformation among Al-F complexes.
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  • 收稿日期:  2014-01-16
  • 刊出日期:  2014-11-15
营浩, 张显晨, 郜红建. 不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响[J]. 环境化学, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
引用本文: 营浩, 张显晨, 郜红建. 不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响[J]. 环境化学, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
shu
YING Hao, ZHANG Xianchen, GAO Hongjian. Variation of fluoride composition in tea garden soil leachate under citric acid of different pH[J]. Environmental Chemistry, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
Citation: YING Hao, ZHANG Xianchen, GAO Hongjian. Variation of fluoride composition in tea garden soil leachate under citric acid of different pH[J]. Environmental Chemistry, 2014, 33(11): 1885-1892. doi: 10.7524/j.issn.0254-6108.2014.11.013
shu

不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响

  • 1.  安徽农业大学资源与环境学院, 合肥, 230036;
  • 2.  安徽农业大学茶叶生物化学与生物技术教育部重点实验室, 合肥, 230036
  • 收稿日期:  2014-01-16
基金项目:

国家自然科学基金(31272254)

安徽省杰出青年科学基金(1408085J01)资助.

摘要: 通过连续流动搅拌法,研究了不同pH的柠檬酸对茶园土壤溶出液中氟组分变化的影响.结果表明,土壤溶出液的pH随溶出时间的延长而逐渐减小.土壤溶出液中的游离态氟和总氟的浓度随时间的延长和柠檬酸pH的升高而逐渐减小,且呈现初始(0-6 h)溶出浓度较高,而后(6-10 h)逐渐减缓的趋势.土壤氟的溶出过程用一级动力学方程、Elovich方程、扩散方程和双常数方程均有较好的拟合,决定系数(R2)均大于0.90.低pH(pH 3.5)条件下,F主要以H-F形态存在,随着pH的升高(pH 4.0-5.0),H-F形态的氟减小,Al-F络合态的氟增多,且随时间延长,溶出浓度均降低.反应开始的前1 h,Al-F络合物主要以AlF3为主,占氟溶出总量的90%以上;至7 h时,AlF2+的溶出量逐渐增大,并逐渐超过AlF3.低pH的柠檬酸促进土壤游离态氟和总氟的溶出,有利于络合态氟的形成,但对Al-F络合物的形态转化没有显著影响.

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