Page 10 - Prescription for Crime Drug Testing
P. 10
Lab 2
Solutions
Lab 2, Part A Solutions
❖ What measurement is represented on group of different peaks is a signature or
the X Axis? fingerprint for that unique drug of its individual
Time the material is retained on the column components. The tallest peaks are most
abundant.
❖ What measurement is represented on the Y axis?
Peak height in mcounts ❖ The five different included knowns are:
Oxycodon, amphetamine, methamphetamine,
cocaine, ketamine
❖ What measurement is represented on the X axis?
m/z mass to charge ratio)
❖ Which of the five known drugs does the
unknown drug resemble most?
❖ What measurement is represented on the Y axis? Methamphetamine, because the peaks in the
% of intensity of signal GC and MS graphs almost match
❖ Which graph is associated with the GC ❖ Do significant differences exist between the
portion of the analysis? unknown drug from the crime scene and the
The top graph known drug it resembles the most? If so, what?
Yes, there seem to be additional peaks.
❖ Which graph is associated with the Mass
Spec portion of the analysis? ❖ What is the source of additional peaks
The bottom graph present in the crime scene sample that are
not present in the known sample?
The chemical components of the white
❖ What is the significance of the different peaks
or lines observed on each graph? powder used as a diluents or unique chemicals
They represent a chemical that has separated specific to chemical synthesis of this batch of
from other chemicals in a mixture. Each methamphetamine
10 THE MYSTERY OF LYLE AND LOUISE
