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43
SECTION 3,
continued
5. Start the magnetic stirrer and increase the speed until the
rotor loses its cycle. Adjust until the rotor regains its cycle.
Mark this point on the speed scale of the stirrer. This
identifies the optimum working point. Insufficient stirring
will cause low results.
6. Insert the DO probe into the funnel and bottle. Make sure that
no air bubbles form on the membrane.
7. Allow a few seconds for the reading to stabilize. The reading
will continue to decrease over time. The initial quick decrease
will level off and become more constant. Record the initial
DO concentration.
8. Record DO manually or store the value in the meter every
minute for 15 minutes or until the DO concentrations drops
below 1 mg/L.
9.
a. If running the OUR test, calculate the decrease in oxygen
during the test using the equation below:
b. For the SOUR test, first use the equation above to
determine the OUR value. Second, divide the mg/L total
solids or total volatile suspended solids by 1000 to
determine concentration in grams per liter. Divide the
OUR value by this concentration to determine
mg/L/g/hour.
Initial reading
Final reading
–
Length of test in minutes
----------------------------------------------------------------------------
60minutes
×
OUR in mg/L/hour
=
OUR in mg/L/hour
mg/L Solids determined in step 1
1000
---------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------
SOUR in mg/L/g/hour
=
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