UNIT 8: Sample Preparation & Instruments

Question 1

Population

Answer 1

Set of entities from which information is intended to be gleaned

Question 2

Sample

Answer 2

Material or entity that is taken from a larger group (population), that is used to represent the larger group. A subset of the population

Question 3

Sampling

Answer 3

The process by which a subset is taken from the population that would be use for study

Question 4

Sample Preparation

Answer 4

This is the process by which samples are prepared for analysis. This is done to achieve compatibility with instrument

Question 5

Forensic Toxicologist can obtain specimen form

Answer 5

1. Botanical
2. Industrial/Environmental
3. Related materials (e.g. scene residue)
4. Body components (Biological specimen)

Question 6

Where can blood be obtained?

Answer 6

Blood can be obtained ante-mortem and postmortem preparations, as well as spatters.

Question 7

Urine’s Composition

Answer 7

• water - 95 %
• Other major and common constituents are sodium - 0.4%, ammonia - 0.05 %, phosphates - 0.6 %, urea - 2 %, sulfate - 0.2 % and creatine,
• Normally, soluble substances are excreted in the urine.
• Contains high concentrations of drugs and metabolites

Question 8

Hair’s Composition

Answer 8

• 65-95%protein,
• 1-9% lipid, trace elements, polysaccharides and water
• Minute amounts of drugs are entrapped in the cortex

Question 9

blood sample screen provides

Answer 9

a list of toxic substances present in the subject’s body at the time of collection