Test Procedures
The reacted blank will be stable if stored in the dark.
To eliminate error caused by contamination, wash all glassware with 20% sulfuric acid.
For greater accuracy, a minimum of three repetitions should be performed and the results
averaged.
Some samples may be digested completely in less than two hours. The concentration may
be measured at 15 minute intervals while the vials are still hot until the reading remains
unchanged. The vials should be cooled to room temperature before the fi nal measurement
is taken.
COD
, LOW RANGE
SMART Spectro 2 Test Procedures 05.02.16
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