Hach DR/850 Procedures Manual page 200

IRON, TOTAL,
Summary of Method
REQUIRED REAGENTS & APPARATUS (Using Powder Pillows)
Description
FerroVer Iron Reagent Powder Pillows ...................1 pillow ............... 100/pkg.......... 21057-69
Sample cell, 10-20-25 mL, with screw cap .................. 1......................... 6/pkg.......... 24019-06
REQUIRED REAGENTS & APPARATUS (Using AccuVac Ampuls)
FerroVer Iron Reagent AccuVac Ampuls ................1 ampul ................. 25/pkg.......... 25070-25
Beaker, 50 mL............................................................... 1........................... each........... 500-41H
OPTIONAL REAGENTS
Description
Ammonium Hydroxide, ACS ................................................................500 mL.............. 106-49
Drinking Water Standard, Metals, LR (Cu, Fe, Mn) .............................500 mL.......... 28337-49
Drinking Water Standard, Metals, HR (Cu, Fe, Mn) .............................500 mL.......... 28336-49
Hydrochloric Acid Standard Solution, 6 N............................................500 mL.............. 884-49
Hydrochloric Acid, ACS........................................................................500 mL.............. 134-49
Iron Standard Solution, 100 mg/L .........................................................100 mL.......... 14175-42
Iron Ampule Standard, 50 mg/L ............................................................ 20/pkg.......... 14254-20
Nitric Acid, ACS....................................................................................500 mL.............. 152-49
Nitric Acid Solution, 1:1........................................................................500 mL............ 2540-49
RoVer Rust Remover ................................................................................ 454 g.............. 300-01
Sodium Hydroxide Standard Solution, 5.0 N .............................100 mL MDB............ 2450-32
Water, deionized............................................................................................4 L.............. 272-56
continued
Interfering Substance
Turbidity
Sample pH (extreme)
Highly Buffered Samples
FerroVer Iron Reagent reacts with all soluble iron and most
insoluble forms of iron in the sample to produce soluble ferrous
iron. This reacts with 1,10-phenanthroline indicator in the reagent
to form an orange color in proportion to the iron concentration.
Interference Level and Treatment
1. Add 0.1 g scoop of RoVer Rust Remover to the blank
in Step 3. 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 filter or centrifuge.
5. Use filtered sample in Steps 3 and 6.
Adjust pH to 3-5. See Interferences in Section 1.
Adjust pH to 3-5. See Interferences in Section 1.
Quantity Required
Per Test
200
Unit Cat No.
Unit Cat. No.