|
Advantages
of grab sampling
|
Disadvantages
of grab sampling
|
|
Low cost
|
inaccurate;
|
|
Takes little time
|
Results depend upon positioning of the tube;
|
|
Immediate result
|
Only a ‘snap shot’ is taken during a small
amount of time;
|
|
Operators need little experience
|
The pump may be inefficient or inaccurate
in each sample;
|
|
Gives indication during emergency
spillages, etc.; and
|
Chemical use only (no dusts); and
|
|
Good for ‘coarse’ indication of measurement
|
Substance specific – the substance sampled
must be known.
|
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