Hach 2100P - Page 43

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SECTION 3, continued
Preparing the 20, 100 and 800 NTU standards
Table 1 Formazin Standard Preparation
Step 1 Step 2 Step 3
Standards
20 NTU Add 100 mL of
dilution water to a
clean 200-mL class
A volumetric flask.
With a TenSette*
pipet, add 1.00 mL
of well-mixed
4000 NTU Formazin
stock solution to the
200-mL flask.
* A class A volumetric pipet may be used in place of a TenSette Pipet.
Dilute to the mark
with dilution water.
Stopper and mix.
100 NTU Add 100 mL of
dilution water to a
clean 200-mL class
A volumetric flask.
With a TenSette
pipet, add 5.00 mL
of well-mixed
4000 NTU Formazin
stock solution to the
200-mL flask.
Dilute to the mark
with dilution water.
Stopper and mix.
800 NTU Add 50 mL of
dilution water to a
clean 100-mL class
A volumetric flask.
With a TenSette
pipet, add 20.00 mL
of well-mixed
4000 NTU Formazin
stock solution to the
100-mL flask.
Dilute to the mark
with dilution water.
Stopper and mix.