Chromium, Hexavalent
Chromium, Hexavalent
Page 2 of 4
ChromiumHex_UniCell_Other_DCH_Eng_Ody.fm
Interferences
The ions listed in the table have been tested up to the given concentrations.
Cumulative effects and the influence of other ions have not been evaluated.
Higher amounts of iron, copper, and reducing or oxidizing agents will cause a
negative interference. Lead, mercury, and tin will cause a positive interference.
Note: Chromium concentrations above 20 mg/L produce result displayed within the measuring
ranges given above. In such cases it is recommended that an accuracy check be carried out
by dilution.
Note: Undissolved chromium is not determined with the determination of chromium VI. Total
Chromium can only be determined using the Total Chromium procedure.
5. Touch the timer icon.
Touch
OK.
A five-minute reaction
period will begin.
6. Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
When the timer beeps,
wipe the zero vial (white
cap) and place it into the
cell adapter.
7. Touch Zero.
The display will show:
0.00 mg/L Cr
6+
Underrange
8. Wipe the sample vial
and place it into the cell
adapter.
Touch
Read.
Results will appear in
mg/L Cr
6+
.
Zero
Interfering Substance Interference Levels
Cl
–
1000 mg/L
Ca
2+
125 mg/L
Mg
2+
, NH
4
+
100 mg/L
Zn
2+
, Ni
2+
,
Co
2+
, Cd
2+
50 mg/L
Cu
2+
, Fe
3+
10 mg/L
Sn
2+
1 mg/L
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