Physico-chemical measurements of CL-20 for environmental applications: comparison with RDX and HMX

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Pages125132; # of pages: 8
AbstractCL-20 is a polycyclic energetic nitramine, which may soon replace the monocyclic nitramines RDX and HMX, because of its superior explosive performance. Therefore, to predict its environmental fate, analytical and physico-chemical data must be made available. An HPLC technique was thus developed to measure CL-20 in soil samples based on the US Environmental Protection Agency method 8330. We found that the soil water content and aging (21 days) had no effect on the recoveries (>92%) of CL-20, provided that the extracts were kept acidic (pH 3). The aqueous solubility of CL-20 was poor (3.6 mg l-1 at 25 degreeC) and increased with temperature to reach 18.5 mg l-1 at 60 degreeC. The octanol-water partition coefficient of CL-20 (log KOW = 1.92) was higher than that of RDX (log KOW = 0.90) and HMX (log KOW = 0.16), indicating its higher affinity to organic matter. Finally, CL-20 was found to decompose in non-acidified water upon contact with glass containers to give NO2- (2 equiv.), N2O (2 equiv.), and HCOO- (2 equiv.). The experimental findings suggest that CL-20 should be less persistent in the environment than RDX and HMX.
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AffiliationNational Research Council Canada; NRC Biotechnology Research Institute
Peer reviewedNo
NRC number45948
NPARC number3539566
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Record identifier7eca4c3c-8305-42d4-9d0d-01421f461c3e
Record created2009-03-01
Record modified2016-05-09
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