trace vs bulk

Question 1

trace evidence

Answer 1

10-100ng
often challenged in court so needs to be water tight

Question 2

bulk evidence

Answer 2

mg or more
quantitative analysis done

Question 3

sampling methods

Answer 3

1. swabbing - solvent = polar mix
2. vaccuuming - for fabrics
3. solvent wash

Question 4

how can a sample be cleaned/ pre concentrated?

Answer 4

solid phase extraction
-normal phase
-reverse phase
-ion exchange
-size exclusion