LaMotte Dissolved Oxygen Water Quality Test Kit - Manual (Page 16)

16
BOD
1
2
1
2
Collect two samples
according to
Part 1 – Collecting
the Water Sample.
Test one sample immediately
by following the procedures in
Part 2 – Adding the Reagents
and Part 3 – The Titration.
Cover the bottle containing
the second sample completely
with aluminum foil to ensure
complete darkness. This will
prevent changes in the oxygen
concentration caused by
photosynthesis in algae
that may be present in
the sample.
Incubate the second sample,
holding the temperature at
20 °C for fi ve days.
After fi ve days, test the incubated
sample by following the
procedures in Part 2 – Adding
the Reagents and Part 3 – The
Titration.
Subtract the second dissolved
oxygen reading from the initial
dissolved oxygen reading to
obtain BOD in units of ppm.
1. 2.
3. 4.
5.