163 

 ramp at 10°C/min up to 220°C, and then a 16.0 min hold at 220°C. The transfer line 



was concurrently ramped, at the onset of the program, from 50°C to 220°C at 



20°C/min for 8.5 min, then held at 220°C for the remaining 27.0 min of the analysis. 



The experiments were conducted with by PCI and NCI with methane reagent 



gas at an indicated pressure of 1680 mtorr. The column employed was a 25 m x 0.20 



mm i.d. (df=0.33 p,m) HP-FFAP FSOT column. The scan rate for all neutral loss 



scans was 0.5 s per scan over m/z 50-650. Each analysis consisted of examining three 



different neutral losses, controlled by a program written in ICL language on the 



TSQ70. The program allowed for incrementing the neutral loss data acquired with 



each scan such that a specific neutral loss was sampled every 1.5 s. The electron 



multiplier was set at -1400 V. The filament emission current was 200 jiA with 100 



eV electron energy. The ion source temperature was set at 150°C and the manifold 



temperature was set at 70°C. The instrument was tuned, at the beginning of each 



day, to optimize the transmission of daughter ions, in both the positive and negative 



mode, produced from the m/z 69, 219, 264, and 414 ions of PFTBA. Positive ion 



daughter spectra were acquired with -5 kV on the conversion dynode. Negative ion 



daughter spectra were acquired with -1-5 kV on the conversion dynode. 



Results and Discussion 



Analysis of Multiple Beads Without GC Separation 



The analysis of handled glass beads requires the analysis of a complex sample. 

 It is estimated that there are typically over 350 distinct component peaks visible in 



