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6
CH3041
SAMPLING DEVICES
Selection
of a sampling device is based on:
1)
sample collection must not disturb the
environment significantly.
environment significantly.
2) the
components of the device and any
sample containers used must not interact
with the analyte (esp. plastics, metals).
sample containers used must not interact
with the analyte (esp. plastics, metals).
• These parameters are important, if the analyses are not reliable then they are worthless: “garbage in - garbage out”
eg. a
plastic hose is used to transfer water
it adsorbs » 10% of a pesticide \ REPEAT.
it adsorbs » 10% of a pesticide \ REPEAT.
