What is it about?
The soaking of polymers: Amberlite XAD-7 and XAD-16 in water or acetone, followed by freezing in liquid nitrogen results in significant changes in their surface properties (texture and porosity). These modifications affect the explosive nitramines adsorption/desorption from aqueous samples in solid phase extraction.
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Why is it important?
The modifications performed (soaking, freezing) allow to increase the recovery rates as compared with the initial adsorbents from 10 to 15%. As a result of the use of the salting-out procedure, a 2-3-fold increases in recoveries, e.g. up to a level of 72% was achieved. The results have been corroborated by swelling of the modified polymers and the occurrence of a process of an additional nitramine uptake by sorption.
Perspectives
The foregoing results indicate that the soaking/freezing method for polymer adsorbents allow to modify their surface properties. By this method SPE adsorbents are obtained that make effective separation from aqueous solutions explosive nitramines, including CL-20 and TEX for which the availability of satisfactory literature data concerning the SPE technique continue to be lacking.
Dr Waldemar Tomaszewski
Politechnika Warszawska
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This page is a summary of: Solid-phase extraction of explosive nitramines on macroreticular polymers modified by freezing with water or acetone, Journal of Separation Science, March 2016, Wiley,
DOI: 10.1002/jssc.201501141.
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