Hach 2100AN Instrument Manual page 38

SECTION 3,
continued
Standard
Add 100 mL of dilution water to a
20 NTU clean 200-mL class A volumetric
flask
Add 50 mL of dilution water to a
200 NTU clean 100-mL class A volumetric
flask
Add 50 mL of dilution water to a
1000 NTU clean 100-mL class A volumetric
flask
Transfer approximately 30 mL of well
mixed 4000-NTU Formazin stock
4000 NTU
solution to a clean sample cell. No
dilution is required.
Use in the sealed ampule as
7500 NTU
provided. DO NOT open the vial or
Ampule
use its contents as dilution stock.
* Class A volumetric pipets can be used in place of a TenSette Pipet.
Table 2 Formazin Standard Preparation
Step 1
With a TenSette
mL of well-mixed 4000-NTU
Formazin stock solution to the
200-mL flask.
With a TenSette* Pipet, add 5.00 mL
of well-mixed 4000-NTU Formazin
stock solution to the 100-mL flask.
With a TenSette* Pipet, add 25.00
mL of well-mixed 4000-NTU
Formazin stock solution to the
100-mL flask.
Note: Install each cell with the orientation mark aligned with the cell holder reference mark
when using matched vials.
Step 2
®
* Pipet, add 1.00
38
Step 3
Dilute to the mark with dilution water.
Stopper and mix.
Dilute to the mark with dilution water.
Stopper and mix.
Dilute to the mark with dilution water.
Stopper and mix.