Iron
Iron
Page 2 of 4
Iron_PP_Other_FEZ_Eng_Ody.fm
Interferences
5. Fill another sample
cell with 25 mL of sample
(this is the blank).
6. When the timer
beeps, insert the blank
into the cell holder.
7. Touch Zero.
The display will show:
0.000 mg/L Fe
8. Place the prepared
sample into the cell
holder.
Touch
Read.
Results will appear in
mg/L Fe.
Interfering Substance Interference Levels and Treatments
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 3, for 1 minute in a boiling
water bath. Cool to 24 °C (75 °F) before proceeding with step 4. Return the sample volume to
25 mL with deionized water.
Or, use any of the digestions in Section 4.
Magnetite (black iron oxide)
or Ferrites
1. Fill a 25-mL graduated cylinder with 25 mL of sample.
2. Transfer this sample into a 125-mL Erlenmeyer flask.
3. Add the contents of one FerroZine
®
Iron Reagent Solution Pillow and swirl to mix.
4. Place the flask on a hot plate or over a flame and bring to a boil.
5. Continue boiling gently for 20 to 30 minutes.
Note: Do not allow to boil dry.
Note: A purple color will develop if iron is present.
6. Return the boiled sample to the 25-mL graduated cylinder. Rinse the Erlenmeyer flask with small
amounts of deionized water and empty into the graduated cylinder.
7. Return the sample volume to the 25-mL mark with deionized water.
8. Pour this solution into a sample cell and swirl to mix.
Proceed with steps 5–9. Or, use any of the digestions in Section 4.
Rust
Boil the sample, with the FerroZine
®
Iron Reagent from step 3, for 1 minute in a boiling water bath.
Cool to 24 °C (75 °F) before proceeding with step 4. Return the sample volume to 25 mL with
deionized water.
Or, use any of the digestions in Section 4.
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
Zero
10 mL
20 mL
25 mL
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