Clays and Clay Minerals

, Volume 47, Issue 5, pp 658–663 | Cite as

Role of Tartaric Acid in the Inhibition of the Formation of Al13 Tridecamer using Sulfate Precipitation

  • G. S. R. Krishnamurti
  • M. K. Wang
  • P. M. Huang


Polynuclear Al13 tridecamer species are the major hydrolyzed species of aluminum, but their occurrence in terrestrial environments has not been established. X-ray diffraction (XRD), 27Al nuclear magnetic resonance (NMR), and scanning electron microscope (SEM) analyses show that the presence of tartaric acid (concentration range of 10−5–10−3 M), one of the commonly occurring low-molecular-weight organic acids, inhibits the formation of the Al13 tridecamer species.

In the absence of tartaric acid, the basic aluminum sulfate crystals were of tetrahedral morphology and conformed to isometric symmetry with a = 17.748 Å and space group of P4232. Increasing amounts of tartaric acid [tartaric acid/Al molar ratio (R) ranging from 0.01 to 0.05] modified the crystal morphology from the tetrahedral particles of isometric symmetry (R = 0) to rod-shaped particles of monoclinic symmetry (R = 0.01) to irregularly shaped X-ray noncrystalline microparticles (R = 0.05). Failure to detect the presence of Al13 tridecamer, the dominant hydrolyzed species of aluminum, in terrestrial environments may be partially attributed to the presence of low-molecular-weight organic acids, which inhibit the formation of Al13 tridecamer species.

Key Words

Al-Hydroxy Sulfates Al13 Tridecamer Powder XRD Data SEM Solid-State NMR Tartaric Acid 


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Copyright information

© The Clay Minerals Society 1999

Authors and Affiliations

  • G. S. R. Krishnamurti
    • 1
  • M. K. Wang
    • 1
    • 2
  • P. M. Huang
    • 1
  1. 1.Department of Soil ScienceUniversity of SaskatchewanSaskatoonCanada
  2. 2.Present address: Department of Agricultural ChemistryNational Taiwan UniversityTaipeiTaiwan

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