Hach-Lange BODTRACK II User Manual - Manual (Page 14)

Dilution is necessary if samples have BOD values more than 700 mg/L.
At elevations higher than 5000 feet above sea level, the 0 to 35 mg/L BOD
range is decreased to 0 to 25 mg/L BOD. Adjustment is not necessary for other
test ranges.
Refer to Special considerations on page 18 for special considerations
including sample seeding and pretreatment.
Use only BODTrak II stir bars and bottles. These items are made specifically to
be used with the BODTrak II.
Simplified procedure
Items to collect:
• BODTrak II bottle
• Thermometer
• Blender (optional)
• Graduated cylinder
• Nutrient buffer pillow (1x)
Use the correct sample volume for the BOD range as shown in Table 4 .
Table 4 Simplified sample volumes
BOD range (mg/L) Sample volume (mL)
0 to 35 420
0 to 70 355
Table 4 Simplified sample volumes (continued)
BOD range (mg/L) Sample volume (mL)
0 to 350 160
0 to 700 95
1. Heat or cool the
sample to 19 to 21 ºC. 2. Homogenize the
sample in a blender if it
contains large
settleable or floatable
solids. 3. Select the correct
sample volume for the
BOD range (
Table 4 ).
Measure the sample
into a graduated
cylinder.
4. Add the contents of
1 nutrient buffer pillow
to the graduated
cylinder. 5. Move the contents of
the graduated cylinder
to a BODTrak II bottle.
Continue to
Completion
steps for all procedures
on page 15. Repeat
steps 1 to 5 for
additional samples.
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