Hanna Instruments HI 83099 User Manual

Page 10

• Remove the cap and fill the Demineralizer Bottle with tap water.

• Replace the cap and shake gently for at least 2 minutes.

• Open the upper part of the Demineralizer Bottle cap and gently squirt the demineralized water into the

cylinder, up to the 100 mL mark.

Note: The ion exchange resin contained in the Demineralizer Bottle is provided with an indicator
substance. The indicator will change from green to blue when the resin has been exhausted and needs
to be replaced.

• Pour the solution in the large 170 mL beaker, replace the cap and invert several times to mix.

• Filter the treated sample into an empty beaker.

The sample is now ready.

• 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.

CONCENTRATED SAMPLES:

If the analysis result is over the method range, the sample should be diluted. The following procedure
describe how to dilute the sample by a factor “N” (that is, to dilute by “N times”):

• Use the graduated cylinder to measure exactly V mL of sample. For volumes V < 20 mL, accurately

dose the sample by mean of the syringe.

Note: To measure exactly 5 mL of sample with the syringe, push the plunger completely into the
syringe and insert the tip into the sample. Pull the plunger out until the lower edge of the seal is on
the 5 mL mark of the syringe.