Removing Turbidity And Color - Hanna Instruments HI83325 Instruction Manual

• Open the upper part of the Demineralizer Bottle cap and
squirt gently the demineralized water into the cylinder, up to
the 100 mL mark.
• Clean and dry the large 170 mL beaker, then pour the
solution from the graduated cylinder to the large 170 mL
beaker, replace the cap and invert several times to mix.
• If the solution contains some turbidity or color, follow the procedure described in REMOVING
TURBIDITY AND COLOR section.

8.6. REMOVING TURBIDITY AND COLOR

Turbidity and color in samples will adversely affect the nutrient analysis. This procedure removes
turbidity and color.
Note: Perform any necessary dilutions before attempting to remove turbidity or color.
1. If the sample is extremely turbid, pour the sample into the large 170-mL beaker. Allow the
sample to stand in the beaker until most of the solid particles have settled. Then, use the pipette
to transfer the particle-clear supernatant solution to the 100-mL graduated cylinder. Discard
sample containing visible particles. Repeat the process until you have filled the graduated
cylinder to the 100-mL line. Clean the 170-mL beaker with demineralized water and dry it
before using it again.
2. Pour 100 mL of sample into the large 170-mL beaker.
3. Add 1 powder packet of Activated Carbon.
4. Mix well using the spoon and then wait 5 minutes.
5. Fold a filter disc twice as shown in the figure. Separate
one side from the other three to form a cone. Insert the
folded filter disc in the funnel.
6. Filter the treated sample into an empty beaker.
The sample is now ready.
Note: Filter at least 40 mL of solution if all four methods
will be tested. If the solution is still turbid or colored, treat
it again with a packet of active carbon. After use, throw
the filter disc away and wash the syringe and the filter
assembly well. Always use a new disc for another sample.
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