YSI BOD Analyst Pro - Manual (Page 49)

YSI BOD Analyst Pro ® User Manual 49
Seed Volume (ml)
This is the seed volume in milliliters introduced into BOD bottles that use seed. If the field is left
blank the seed volume defaults to zero.
Initial DO (mg/l)
This is the measured dissolved oxygen at the beginning of the incubation period expressed in
milligrams per liter.
Final DO (mg/l)
This is the measured dissolved oxygen at the end of the incubation period expressed in milligrams
per liter.
O
2
Depl (mg/l)
This calculated value is the difference between the Initial and Final DO readings during the
incubation. Normalization factors may apply. For a 5-day BOD the Normalization Factor is 1.00.
If blank compensation is checked (General Setup Form), the depletion calculation removes any
DO depletion due to the Blank (Dilution) Water. This field is automatically calculated:
= (Norm Factor * (Initial DO – Final DO)) - (Blank Comp per ml * Blank Water in Sample)
Seed Corr (mg/l)
This calculated value corrects the BOD test for oxygen depletion resulting from the presence of
seed. Seed correction per ml is derived from seed control tests. The Seed Correction / ml is
multiplied by the amount of seed used in the test. See the equation below.
If there is no seed used in the test the seed factor is zero. The seed factor will also be shown as
zero if all seed tests are marked as unacceptable. Unacceptable seed can produce invalid results
for tests that use seed.
Seed Factor = Seed Correction per ml * Seed Volume in ml
BOD (mg/l)
This is the calculated BOD for the bottle. The calculation considers not only dilution but also the
various factors described above as they apply to each bottle.
Final BOD (mg/l)
This is the average of the BODs from all dilutions in a sample. The exception to this is when
some individual BODs for bottles are marked unacceptable. For Samples that have marked bottles
the Final BOD is the average of the unmarked bottles or the BOD of the one bottle remaining if
that is the case. If all bottles in the Sample are marked unacceptable, a Final BOD is not reported.
5.14 DELETING A BOTTLE
To remove a bottle from a batch right click on
the Sample Name and click on Delete Row. The
row and its contents will disappear. Click on
Apply Changes at the bottom of the Bench
Sheet and the new revised batch will appear.