Recovery of some common solvents from protective clothing breakthrough indicator pads by microwave-solvent extraction and gas chromatography

摘要

The efficiency of solvent adsorption using Permea-Tec general solvent pads, used for the detection of chemical breakthrough of protective clothing, was determined for methanol, acetone, ethyl methyl ketone, trichloroethylene (TriCE), tetrachloroethylene (TetCE), toluene, m-xylene, and D-limonene. Known volumes of single or mixed solvents were added to pads in the range 0.2-5.0 mu l (0.16-8.13 mu g). After microwave;solvent extraction (ME) into hexan-1-ol, the samples (0.5-3.0 mu l) of the filtered and extracted solutions were analysed by gas chromatography. All solvents exhibited > 97% adsorption on the pads at spiking levels of 0.48-0.98 mu g for each solvent. The solvent recovery for the system was calculated for each solvent, with solvents with boiling points below 110 degrees C showing recoveries of > 90%, and with solvents with boiling points above 110 degrees C showing recoveries from 80% to 90%. The recovery precision was good (RSD less than or equal to 4%) for all solvents over the range 1.0-2.5 mu l of applied solvents to pads for ME and 1.0 mu l of extracted solutions for GC analysis. [References: 7]