Red Sea Trace-Colors Manuel Utilisateur page 11

9. Ensure that the dispensing tip is on the 1 ml titration syringe and fill with 0.5 ml of
Potassium Pro Titrant (D).
Note for filling the 1ml titration syringe: Raise the plunger of the syringe until the bottom ring
of the plunger (see arrow in diagram) is at the 0.5 ml mark. The surface of the liquid will be
approximately 0.1 – 0.15 ml below the plunger. Do not try to remove the air trapped between
the liquid and the plunger. This small volume of air corresponds to the liquid held inside the
plastic tip.
10. Insert the syringe into the center of the
Titrator so that the volumetric scale on
the side of the syringe is visible. The
graduations of the volumetric scale
are 0.01 ml, equivalent to 3 ppm of
potassium.
11. Screw the glass vial onto the bottom of
the Titrator.
12. Add one drop at a time of Potassium Pro Titrant (D) by pressing the plunger of the syringe and
gently swirling after each drop, until the end color is achieved. Pay careful attention to the color
of the test sample from the addition of the first drop.
Note: The amount of titrant used is inversely proportional to the level of potassium in the aquarium
water sample. If you reach the end color on adding the first drop the potassium level is 467 ppm
or above.
13. Note the amount of titrant used (according to the initial and final position of the plunger not the
liquid surface) and use the table to calculate the level of potassium in the water sample.
14. Dispose of any unused quantity of titrant. Rinse all syringes, glass vials and filter kit with RO or
distilled water before storing.
15. Filter papers are for single use only and cannot be reused.
0.9
0.8
0.7
Initial
0.6
position
0.5
0.5 ml
0.4
mark
0.3
0.2
0.1
Trace-Colors
0.7
0.6
0.5
Final
position
0.4
0.3
the bottom ring
of the plunger
0.2
0.1
0.0
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™
GB