The trapping, storing, and subsequent analysis of XXXX in in-vitro samples previously analyzed by a nondestructive technique.

@entity1 @entity167 @entity31752 @entity3440 @entity1068
There is a need for a simple technique to collect breath samples of @entity1 suspected of driving under the influence of @entity167 . Solutions containing @entity1068 were analyzed using dichromatic oxidation procedures. The standard solutions were placed in a breath @entity167 simulator at 34 degrees C and the vapors analyzed with a CMI Intoxilyzer, Model 4011AS, with one-way valves placed at either end to prevent air entering the outlet or leaving through the inlet. The analyzed 715-mL vapor sample was then pumped through an activated @entity3440 gel column. The trapped @entity167 was removed from the column with water, and the resulting solution was analyzed by @entity31752 oxidation, liquid injection, and headspace gas chromatographic procedures. A very good linear relationship between concentration and peak height ratio was obtained by gas chromatography. The slope of the graph was used to calculate the percentage of blood @entity167 for breath samples previously analyzed by the Intoxilyzer. The average deviation from the correct @entity167 value was +/- 5%. Samples were collected, stored, and analyzed after 15, 90, and 120 days with no apparent loss of @entity167 . The three methods of analyzing the trapped @entity167 were compared. Over 100 trapped samples were collected in the field and analyzed, and the laboratory analyses were compared with the breath analyzer printouts.
