YSI BOD Analyst Pro - Manual (Page 84)

YSI BOD Analyst Pro ® User Manual 84
values would be visible for the seed samples, but no seed corrections would be applied to any
sample to which seed was added. In the figure above (just above the data table) note the comment
“No seed correction”.
In the above example BODs of 63.00, 47.50, and 31.40 mg/l were listed in the BOD column for
Seed Samples (top to bottom). However, under the Notes column (far right) “D, SD” was
reported and defined at the bottom of the Bench Sheet. D indicates that “Depletion out of range”
and SD indicates that “Seed Depletion Percentage out of range”. In the latter this indicates that
none of the samples met the 40% min and 60% max oxygen depletion rule ((final DO/initial DO)
* 100). In this example the percentages were 78%, 77% and 81% from top to bottom of the seed
samples. All exceeded the 60% criterion set.
OPTION 3
As an extension of Option 2 the Manual Unmark tool (see figure below) can be used to unmark
the seed samples. This action applied to the seed samples not only allows the program to calculate
oxygen depletion that is less than 2 mg/l (see figure below) but also allows the program to apply
the seed correction values to all samples identified as having seed added.