L1 /
3
CH3041
SAMPLE TYPES
• Grab sample: individual sample collected
at 1 time.
at 1 time.
• Replicate
sample : duplicate grab sample
• Composite
sample : several grab samples
collected at different times at 1 site which are mixed in a container to average sample
composition - within a 24 h period typically.
collected at different times at 1 site which are mixed in a container to average sample
composition - within a 24 h period typically.
• Split sample : well mixed sample in one container is split in half and half is added to another clean container. Both are analysed.
Checks the analytical method reliability.
Checks the analytical method reliability.
• Spike
sample : a
sample of analyte free matrix
which has been spiked
with a known amnt of the analyte.
Checks recoveries.
