Sci Total Environ 2019 Sep 16;683:175-184. Epub 2019 May 16.
Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, L-091, Livermore, CA 94550, USA; Forensic Science Center, Lawrence Livermore National Laboratory, 7000 East Avenue, L-091, Livermore, CA 94550, USA.
A practical and efficient protocol for the derivatization and detection by GC-EI-MS of isopropyl-, pinacolyl- and cyclohexylmethylphosphonic acids, key diagnostic degradation products of the nerve agents sarin, soman and cyclosarin respectively, in six different types of soil matrices is presented. The method involves the in situ conversion of the phosphonic acids to their respective methyl esters using trimethyloxonium tetrafluoroborate when present in the soils at low levels (10 μg g) without any prior extractions or soil preparation. The soils employed in our study were Nebraska EPA soil, Georgia soil, silt, Virginia type A soil, regular sand and Ottawa sand and were chosen for their vast differences in composition and physical features. Read More