Extraction of Pure Polymer Additives from Separated Adsorbent Bands

3 Extraction of Pure Polymer Additives from Separated Adsorbent Bands 

The separated portions of adsorbent, each, hopefully, containing a pure constituent of the original polymer extract, are now extracted with suitable solvents to isolate the additive preparatory to identification by physical and chemical methods. 

Provided the desorption solvent is sufficiently powerful and polar, it should recover between 50 and 100 % of the additive present in the silica gel fraction and provide sufficient material for examination by UV or IR spectroscopy or MS. 

Chromatographic elution of sample from the resulting powder columns isolated in the collector tubes is accomplished through transfer of a solvent from reservoir by means of a thread wick. 

Compound Absorbance maximum, nm Number of plates prepared Sample size+, pi Sample concentration, % w/v Development solvent Plate drying time, h Section of adsorbent removed from plate, R Solvent used to desorb compound from adsorbent Absorbtivity of standard solution of compound, 1/g/cm Recovery of compound 2 Standard deviation 

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