10.4.3 Procedure. The analysis of the instrument performance check standard is performed by trapping 50
ng of BFB under the optimized preconcentration parameters. The BFB is introduced from a cylinder into the
GC/MS via a sample loop valve injection system similar to that shown in Figure 13.
The mass spectrum of BFB must be acquired in the following manner. Three scans (the peak apex scan and the
scans immediately preceding and following the apex) are acquired and averaged. Background subtraction is
conducted using a single scan prior to the elution of BFB.