Solid-phase extraction using hierarchical organosilicates for enhanced detection of nitroenergetic targets
Brandy J Johnson1, Brian J Melde, Iwona A Leska
1Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC, USA. brandy.white@nrl.navy.mil
Journal of Environmental Monitoring : JEM
|March 17, 2011
Summary
A new porous organosilicate material effectively preconcentrates nitroenergetic compounds from water for HPLC analysis. This novel sorbent shows improved performance and matrix tolerance compared to existing methods.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- Nitroenergetic compounds are significant environmental contaminants.
- Effective preconcentration methods are crucial for their detection in complex matrices.
Purpose of the Study:
- To evaluate a novel porous organosilicate material as a solid-phase extraction (SPE) sorbent.
- To assess its efficacy for preconcentrating nitroenergetic targets from aqueous solutions prior to HPLC analysis.
Main Methods:
- Evaluation of the organosilicate sorbent using spiked deionized water, groundwater, and surface water.
- Analysis of nitroenergetic targets including 2,4,6-trinitrotoluene, 2,4-dinitrotoluene, RDX, HMX, and nitroglycerin.
- Comparison with commercial sorbents (Sep-Pak RDX, LiChrolut EN) and assessment of matrix effects and pH impact.
Main Results:
- The novel sorbent demonstrated superior performance compared to Sep-Pak RDX.
- It exhibited reduced impact from complex environmental matrices (water, soil extracts) than LiChrolut EN.
- The influence of pH on preconcentration efficiency was investigated.
Conclusions:
- The novel porous organosilicate material shows significant potential as an SPE sorbent.
- It offers an effective solution for preconcentrating nitroenergetic targets from diverse aqueous samples.
- This advancement aids in the sensitive detection of these contaminants via HPLC.
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