Iron
Iron
Page 2 of 4
IronTot_None_Other_FVR_Eng_Ody.fm
Interferences
5. Fill the rinsed
cylinder to the 50-mL
mark with sample.
6. Pour the contents of
the 50-mL cylinder into
one of the flasks. Measure
a second 50 mL portion of
sample into the
graduated cylinder and
pour the contents into the
second flask.
7. Add 1.0 mL of
FerroZine Iron Reagent
Solution to one of the
flasks using the Repipet
Dispenser. Swirl to mix.
The remaining flask will
be used as the blank.
8. Touch the timer icon.
Touch
OK.
A five-minute reaction
period will begin.
9. When the timer
beeps, the display will
show:
mg/L Fe
Pour the contents of the
flask containing the blank
into the Pour-Thru Cell.
10. When the flow stops,
touch
Zero.
The display will show:
0.000 mg/L Fe
11. Pour the contents of
the flask containing the
prepared sample into the
Pour-Thru Cell. After the
flow stops, touch
Read.
Results will appear in
mg/L Fe.
12. Flush the Pour-Thru
Cell with at least 50 mL
of deionized water
immediately after use.
Interfering Substance Interference Levels
Strong chelants (EDTA)
Interfere at all levels. Use the FerroVer
®
or TPTZ methods for these samples. Use the TPTZ
method for low iron concentrations.
Cobalt May give slightly high results
Copper May give slightly high results
Hydroxides
Boil the sample, with the FerroZine
®
Iron Reagent added to it from step 7, for 1 minute in a boiling
water bath. Cool to 24 °C (75 °F) before proceeding with step 8. Return the sample volume to
25 mL with deionized water.
Zero
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