Iron
Iron
Page 2 of 4
Iron_UniCell_Other_PHEN_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 copper, nickel, and tin cause a positive interference.
Sample Collection, Storage and Preservation
Collect samples in acid-cleaned or plastic containers. No acid addition is
necessary if analyzing the samples immediately. To preserve samples, adjust the
pH to 2 or less with concentrated nitric acid (about 2 mL per liter). Preserved
samples may be stored up to six months at room temperature. If reporting only
dissolved free iron, filter sample immediately after collection and before adding
nitric acid.
Before analysis, adjust the pH to between 3 and 5 with 5.0 N Sodium Hydroxide
Standard Solution. Do not exceed pH 5 or iron may precipitate. Correct the test
results for volume additions.
5. 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.
6. Touch Zero.
The display will show:
0.00 mg/L Free Fe
Underrange
Note: If the sample was pre-
treated with the Metal Prep Set
(HCT 200), touch Options and
select Tot. Fe.
7. Wipe the sample vial
and place the prepared
sample into the cell
holder.
8. Touch Read.
Results will appear in
mg/L Free Fe.
Zero Read
Interfering Substance Interference Levels
Cl
–
1000 mg/L
Ca
2+
500 mg/L
Ag
+
100 mg/L
Cd
2+
70 mg/L
Co
2+
, Zn
2+
, Pb
2+
, CO
3
2-
, Hg
2+
, Cr
3+
, Cr
6+
50 mg/L
Ni
2+
25 mg/L
Cu
2+
10 mg/L
Sn
2+
5 mg/L
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