Camlab CW8200, Manual

Page: 23 / 48

21
2.3.7.3 Preparation of dilutions from the 4000NTU Formazin-
Stock solution
Prepare the dilutions from a 4000 NTU Formazin stock solution and dilution water.
Standard Step 1 Step 2 Step 3
20 NTU Add 100 ml of
dilution water to
a clean 200 ml
volumetric flask.
Pipette 1.00 ml
well mixed 4000
NTU Formazin stock
solution to this 200
ml flask.
Fill to the mark
with dilution water.
Close and mix the
flask.
200 NTU Add 50 ml of
dilution water to
a clean 100 ml
volumetric flask.
Pipette 5.00 ml
well mixed 4000
NTU Formazin stock
solution to this 100
ml flask.
Fill to the mark
with dilution water.
Close and mix the
flask.
800 NTU 50 ml of dilution
water to a clean
100 ml volumetric
flask.
Pipette 25.00 ml
well mixed 4000
NTU Formazin stock
solution to this 100
ml flask.
Fill to the mark
with dilution water.
Close and mix the
flask.
Use class A volume pipette and glass flask.
Use dilution water for the <0.1 NTU standard.