Hach BODTrak II, User Manual

Page: 14 / 24

Note: If the seed strength is unknown, use 20 mL. Adjust the seed volume as
necessary to achieve optimum results.
1. Heat or cool the
sample to 19 to
21 ºC (66 to 70 ºF).
2. Homogenize the
sample in a blender
if it contains large
settleable or
floatable solids.
3. Select the correct
GGA or sample
volume for the BOD
range (
Table 5 ).
Measure the sample
into a graduated
cylinder.
4. Add the contents
of 1 nutrient buffer
pillow to the
graduated cylinder.
5. If the sample is
seeded, use a
tensette pipet to add
the correct quantity
of seed to the
graduated cylinder
(
Table 5 ).
6. If necessary, add
more nutrient or
buffer. Do not add
more than a total
volume of 50 mL
(seed, nutrient,
buffer).
7. Fill to the final
test range volume if
necessary with a
deionized wash
water bottle
(
Table 5 ).
8. Move the
prepared sample
from the graduated
cylinder to a
BODTrak II bottle.
Continue to
Completion steps for
all procedures
on page 12.
Note: Repeat steps 1 to
8 for additional
samples.
7.4 Completion steps for all procedures
Items to collect:
• BODTrak II
• Spatula scoop
• BOD incubator
• Seal cup
• Stir bar
Required reagents:
• 2 potassium hydroxide pellets
12 English