Blank cartridges residue

Unlike firearm discharge residue, each of the blank cartridges produced a limited range of discharge particle types. 

Figure 19.1 Residue in spent cartridge case (blanks).

Sample preparation Condition a 1 mL C18 Bakerbond SPE cartridge with MeOH. Mix 1 mL plasma with 50 xL 5 xg/mL alpiropride in water. Mix 100 xL pure or diluted urine with 250 xL blank plasma and 100 aL 5 p,g/mL alpiropride in water. Add the sample to the SPE cartridge, wash three times with 1 mL portions of water, wash three times with 1 mL portions of n-hexane diethyl ether 50 50, elute with two 1 mL portions of chloroform triethylamine 90 10 (Caution Chloroform is a carcinogen ). Evaporate the eluate to dr5Uiess under reduced pressure, reconstitute the residue with 150 (aL mobile phase, inject a 100 xL aliquot. 

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