1.2.2 Cleaning of vials and accessories for analysis
Vials, caps and stirring rods should be cleaned thoroughly after each analysis to prevent
interferences.
Procedure:
Clean vials and accessories after each analysis as soon as possible.
a. Clean vials and accessories with laboratory detergent
(e.g. Extran
®
MA 02 (neutral, phosphatic), Extran
®
MA 03 (alkaline, phosphate-free)
from Merck KGaA).
b. Rinse thoroughly with tap water.
c. On demand (see Notes) perform special cleaning as required, e.g.: rinse with diluted
Hydrochloric acid solution.
d. Rinse thoroughly with deionised water.
1.2.3 Guidelines for photometric measurements
1. Vials, caps and stirring rods should be cleaned thoroughly after each analysis to prevent
interferences. Even minor reagent residues can cause errors in the test result.
2. The outside of the vial must be clean and dry before starting the analysis. Clean the
outside of the vials with a towel. Fingerprints or other marks will be removed.
3. If there is no defined vial for the blank, the zeroing and the test must be carried out with
the same vial as there may be slight differences in optical performance between vials.
4. The vials must be positioned in the sample chamber for zeroing and test with the
mark
on the vial aligned with the mark on the instrument.
Correct position of the vial (Ø 24 mm):
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