Fast detection of fluoroacetamide in body fluid using gas chromatography-mass spectrometry after solid-phase microextraction

A novel method for fast determination of fluoroacetamide, a kind of organic fluorine pesticide, in blood and urine samples was developed with acetamide as an internal standard using gas chromatography/mass spectrometry (GC/MS) after solid-phase microextraction (SPME) technique. The SPME was performed by immersing a PDMS fiber of 100 microm coating thickness in a sample solution for 25 min at 70 degrees C with (CH(3)CH(2))(4)NBr to improve the extraction efficiency. After a GC sample injection, the extracted fluoroacetamide was desorbed from the fiber for 4 min to perform the GC/MS detection with a HP-PLOT Q capillary column. The analytical conditions were optimized by examining systematically, the effects of experimental parameters on the ratio of characteristic ion peak areas of fluoroacetamide to acetamide. Under optimal conditions, the ratio was proportional to the concentration of fluoroacetamide ranging from 5.0 to 90 microg/ml with a detection limit of 1.0 microg/ml. The average recovery of fluoroacetamide in blood sample was 92.2%. The established method could be used for the fast and convenient measurement of fluoroacetamide in poisoned sample.