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The SiO 2  content (70–75%) of mineral perlite is converted to soluble silicates with Na 2 CO 3 . The acidification of soluble silicates in perlite forms hydrogels which become xerogels upon drying. The parameters (particle size, specific surface area, pore size and volume, and surface hydroxyl group density) are investigated for perlite modified by Na 2 CO 3  before use as a thin-layer chromatography adsorbent. The modified perlite is mixed with CaSO 4  (a binder) and Na 4 SiO 4  in order to adjust the pH of its 10% suspension in water before its application to the glass surface. The modified perlite (having CaSO 4  and Na 4 SiO 4 ) is called “Perlite IIG7”. Layers prepared with Perlite IIG7 are successfully used for the separation of the dye component in commercially available inks, amino acids, carboxylic acids, mono- and disaccarides, and halide ions.

Modification of Perlite for Use as a Thin-Layer Chromatographic Adsorbent