240 

 previous to this compound are present. However, if a compound was only suspected 

 as being present in the literature sources, then the compound is noted by a (D) in 

 the remarks column. The final remark code (E) is used to denote species which are 

 present in solution only. Since GC involves separation in the gas phase, compounds 

 so noted are not expected to be observed in the analyses of this chapter. 



In summary, this first table provides a general basis from which to proceed. 

 It should be noted that the analyses which follow (in the remainder of this chapter) 

 are specifically designed to provide information on volatiles from the skin. More 

 specifically, these analyses will only consist of volatiles which transfer to glass (beads) 

 and can be thermally desorbed back off of glass to be detected by either cryo-focused 

 GC/MS or purge and trap GC/MS. 

 Cryo-focusing GC/MS 



A single stage of cryo-focusing combined with GC/MS was the primary 

 method used for identification of volatiles in this work. Most of the analyses involve 

 the identification of volatiles from the hands, arms, and forehead of the author of 

 this dissertation. Additional identification of volatiles and repeated confirmation of 

 compound identification came from the case studies presented later in this chapter. 

 Therefore, the data found in this section are compilations of emanations observed 

 from four different subjects. Studies involved the acquisition of PPINCI and EI mass 

 spectral data. Typical RIG traces from a set of PCI, NCI, and EI analyses of the 

 same subject appear in figure 5-1. 



