L1 /
17
CH3041
STREAM ANALYSES
• In a stream with a point organic
nutrient input initially a widespread analysis must be
carried out to find the oxygen sag curve.
carried out to find the oxygen sag curve.
• The critical group will need
to be found
where the BOD drops nearly to zero.
where the BOD drops nearly to zero.
• Often rather than
analyse the organisms
just the absence (or deformities) of an
organism will be used – bioindicators.
just the absence (or deformities) of an
organism will be used – bioindicators.
• A sentinal species is
like the canary.
