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• 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.
probable level of liquid
taken up by syringe
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