Hach DR2400 - Page 339

Iron, Total
Iron, Total
IronTot_AVPP_Other_FVR_Eng_Ody.fm Page 3 of 6
Interferences
5. Touch the timer icon.
Touch
OK.
A three-minute reaction
period will begin.
(Samples that contain rust
should react for at least
5minutes.)
6. When the timer
beeps, place the blank
into the cell holder.
7. Touch Zero.
The display will show:
0.00 mg/L Fe
8. Place the AccuVac
Ampul into the cell
holder.
Touch
Read.
Results will appear in
mg/L Fe.
Interfering Substance Interference Levels and Treatments
Calcium, Ca
2+
No effect at less than 10,000 mg/L as CaCO
3
.
Chloride, Cl
–
No effect at less than 185,000 mg/L.
Copper, Cu
2+
No effect. Masking agent is contained in FerroVer Reagent.
High Iron Levels Inhibit color development. Dilute sample and re-test to verify results.
Iron Oxide
Requires mild, vigorous or Digesdahl digestion. After digestion, adjust sample to pH 3–5 with
sodium hydroxide (Cat. No. 2450-32), then analyze.
Magnesium No effect at 100,000 mg/L as calcium carbonate.
Molybdate Molybdenum No effect at 50 mg/L as Mo.
High Sulfide Levels, S
2–
1. Treat in fume hood or well-ventilated area. Add 5 mL hydrochloric acid, ACS
(Cat. No. 134-49) to 100 mL sample in a 250-mL Erlenmeyer flask. Boil 20 minutes.
2. Cool. Adjust pH to 3–5 with Sodium Hydroxide (Cat. No. 2450-32). Readjust volume to
100 mL with deionized water.
3. Analyze.
Tu rb i di ty
1. Add 0.1 g scoop of RoVer® Rust Remover (Cat. No. 300-01) to the blank. Swirl to mix.
2. Zero the instrument with this blank.
3. If sample remains turbid, add three 0.2 g scoops of RoVer to a 75-mL sample.
Let stand 5 minutes.
4. Filter through a Glass Membrane Filter (Cat. No. 2530-00) and Filter Holder
(Cat No. 2340-00).
5. Use filtered sample in steps 2 and 5.
Extreme Sample pH Adjust pH to 3–5. See Section 3.3 Interferences on page 41.
Highly Buffered Samples Adjust pH to 3–5. See Section 3.3 Interferences on page 41.
10 mL
20 mL
25 mL
Zero