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醋酸-醋酸铵缓冲体系中草酸对高岭石的溶解特征

Dissolution of kaolinite induced by oxalic acid in HAc-NH_4OAc buffer solution
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摘要 采用间歇法模拟研究醋酸-醋酸铵缓冲体系中草酸对高岭石的溶解特征,以了解低分子量有机酸溶解高岭石时,其质子和配体的相对贡献。试验表明:反应液中Al、Si浓度随草酸浓度提高、反应液pH降低及反应时间的推移而增加,当草酸浓度为10 mmol/L,反应液pH为3.5,反应1 656 h后Al、Si的浓度达到最高,分别为2.27和1.86 mmol/L;且配体(RL)促进速率随着反应液酸度的增强而升高;低浓度草酸(1 mmol/L)时,增幅随pH的降低而大幅增加,高浓度草酸(≥5 mmol/L)时,随着酸度的升高,增幅大幅减弱;相对于质子对高岭石的溶解作用,本试验浓度及酸度范围内,配体对高岭石溶解的贡献是主要的。 To investigate the dissolution character of kaolinite induced by oxalic acids in HAc-NH4OAc buffer solution,and the relative contribution of proton and ligand with batch method.The concentration of Al and Si from kaolinite increased with concentration of oxalic acids and acidity of reactive solution and process of reactive time.When the concentration of oxalic acid was 10 mmol/L,acidity of reactive solution was 3.5,after reaction 1656 hours,the concentration of Al and Si reached a maximum,they were 2.27 and 1.86 mmol/L respectively;Ligand-promoted kaolinite dissolution rates(RL)improved with the acidity enhancement;The amplitude of Ligand-promoted kaolinite dissolution evidently improved with the acidity enhancement when the concentration of oxalic acids didn't exceed 1 mmol/L,but the amplitude evidently weaken when the concentration of oxalic acids wasn't less than 5 mmol/L.As far as the contribution of proton-promoted kaolinite dissolution was concerned,the contribution of Ligand-promoted kaolinite dissolution was primary in the range of concentration and acidity of oxalic acids in the experimentation.
出处 《中国土壤与肥料》 CAS CSCD 北大核心 2012年第6期83-87,共5页 Soil and Fertilizer Sciences in China
基金 国家自然科学基金(40371067) 中国科学院知识创新工程项目(KZCX3-SW-417和ISSASIP0208)
关键词 高岭石 草酸 配体 质子 kaolinite oxalic acid ligand proton
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参考文献16

  • 1Stevenson F J. Organgic acid in soil [ A ] , In : MeLaren A D, Peterson (ed) GH. Soil biochemistry (vol. 1) [M]. New York: Mareel Dekker, 1967. 110 - 146.
  • 2SHENALIN,LIXUEYUAN,等.Low-Molecular-Weight Aliphatic Acids in Soils Incubated with Plant Residues Under Different Moisture Conditions[J].Pedosphere,1997,7(1):79-86. 被引量:30
  • 3Blake R E, Walter L M. Effect of organic acids on the dissolu- tion of orthoclase at 80C and pH6 [ J]. Chemical Geology,1996, 132:91 - 102.
  • 4Blake R E, Walter L M. Kinetics of feldspar and quartz disso- lution at 70 80C and near - neutral pH: Effects of organic acids and NaC1 [ J ]. Geochim Cosmochim Acta. 1999, 63 : 2043 - 2059.
  • 5Welch S A, Ullman W J. The temperature dependence of by- townite feldspar dissolution in neutral aqueous solutions of inor- ganic and organic ligands at low temperature (5 35"C) [J]. Chemical Geology, 2000, 167 : 337 - 354.
  • 6Chin P K F, Mills G L. Kinetics and mechanisms of kaolinite dissolution : effects of organic ligands [ J]. Chem Geol, 1991, 90:307-317.
  • 7徐仁扣,季国亮,蒋新.低分子量有机酸对高岭石中铝释放的影响[J].土壤学报,2002,39(3):334-340. 被引量:40
  • 8DaiZH, WangXJ, ZhaoDW, etal. Changes inpH, CEC and exchangeable acidity of some forest soils in southern China during the last 32 35 years [J]. Water, Air, and Soil Pollu- tion. 1998, 108 (3-4): 377-390.
  • 9Kaurichev I S, Ivanova T N, Nozdrunova Y M. Low molecular organic acid content of water - soluble organic matter in soils (English Translated) [J]. Sov. Soil Sci., 1963, 28 (2).. 223 - 229.
  • 10Lundegard P D, Kharaka Y K. Distribution and occurrence oforganic acids in subsurface waters [ A ]. Pittman E D, M B. Organic Acids in Geological Processes [ M ]. Berlin: Spring- Verlag, 1994. 40-69.

二级参考文献45

  • 1王兴祥,胡华锋,李清曼,张蕊.高岭石在醋酸-醋酸铵缓冲体系中的溶解特征[J].土壤,2005,37(2):192-196. 被引量:9
  • 2Hocking PJ. Organic acids exuded from roots in phosphorus uptake and aluminum tolerance of plants ir acid soils. Advances in Agronomy, 2001, 74:63~97.
  • 3Dai ZH, Wang XJ, Zhao DW, Liu YX. Changes in pH,CEC and exchangeable acidity of some forest soils in Southern China during the last 32~35 years. Water, Air,and Soil Pollution. 1998, 108 (3-4): 377~390.
  • 4Wieland E, Stumm W. Dissolution kinetics of kaolinite in acidic aqueous solution at 25℃, Geoehim. Cosmochim.Acta, 1992, 56:3339~3355.
  • 5Ritchie GSP. Role of dissolution and precipitation of minerals in controlling soluble aluminum in acidic soils.Advances in Agronomy, 1994, 53:47~84.
  • 6Lindsay WL, Walthall PM. The solubility of aluminum in soils. In: Sposito G. ed. The Environmental Chemistry of Aluminum. 2nd ed. CRC Press, 1996,333~463.
  • 7Hradil D, Hostomsky J. Effect of composition and physical propertyes of natural kaolinitic clays on their strong acid weathering rates. Catena. 2002, 49:171~181.
  • 8Huertas JF, Chou L, Wollast R. Mechanism of kaolinite dissolution at room temperature and pressure. Part Ⅱ:Kinetic study. Geochim. Cosmochim. Acta, 1999, 63:3261~3275.
  • 9Huang WL, Keller WD. Dissolution of rock-forming silicate minerals in organic acids: Simulated first-stage weathering of fresh mineral surfaces. Am. Mineral., 1970,55:2076~2094.
  • 10Hem JD. Aluminum species in water. In: Baker RA.ed.Trace Inorganics in Water. Am. Chem. Soc. Symp.Serics 73. Am. Chem. Soc. Washington. DC, 1968, 98~114.

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