Lithium Nitrate Fusion for Characterizing Layer Silicates in Disordered Soil Clays1
- A. S. Parashiva Murthy,
- J. B. Dixon and
- G. W. Kunze2
The clay components in many Texas soils are difficult to identify using standard X-ray diffraction techniques because of the diffuse and weak diffraction maxima corresponding to 001 spacings greater than 10A. After fusion of the clay fraction in LiNO3 for 18 hours at 300C, diffractograms with a strong diffraction peak at 18A were obtained. Mixed layered assemblages apparently cause the poor diffraction effects in untreated samples. Fusion with LiNO3 removes interlayer K+ allowing expansion to 18A of Mg-saturated, glycerol solvated samples. X-ray diffraction analysis after LiNO3 fusion clearly establishes the crystallinity of the clay and increases the sensitivity of the X-ray diffraction method to the presence of dioctahedral 2:1 layer structured minerals.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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