Hach-Lange BODTRAK II: Respirometric Biochemical Oxygen Demand (BOD) - Manual (Page 37)

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Section 7 Troubleshooting
Incorrect BOD curves through a 10 day test period are shown in Figure 5 . For
typical curves refer to Figure 4 on page 32 .
Figure 5 Incorrect BOD curves
1 High oxygen demand 4 Initial sample temperature below
20 º C or supersaturated with
oxygen
2 Nitrification 5 Bottle leak
3 Excessive time lag