Hach DR2400 - Page 336

Iron, Ferrous
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 IronFer_AVPP_Other_PHE_Eng_Ody.fm
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Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
The 1,10 phenanthroline indicator in the Ferrous Iron Reagent reacts with ferrous
iron in the sample to form an orange color in proportion to the iron
concentration. Ferric iron does not react. The ferric iron (Fe
3+
) concentration can
be determined by subtracting the ferrous iron concentration from the results of a
total iron test. Test results are measured at 510 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
Ferrous Iron Reagent AccuVac
®
Ampuls..............................................1 ampul........... 25/pkg...............25140-25
or
Ferrous Iron Reagent Powder Pillows...................................................1 pillow........... 100/pkg...............1037-69
Required Apparatus
Beaker, 50-mL............................................................................................1 ....................... each.................... 500-41H
Sample Cells, 10-20-25 mL, w/cap.........................................................2....................... 6/pkg.................24019-06
Required Standards
Ferrous Ammonium Sulfate, hexahydrate, ACS ........................................................... 113 g...................11256-14
Water, deionized ................................................................................................................. 4 liters ....................272-56
Program Portion of Curve ∆Abs ∆Concentration
255 Entire range 0.010 0.028 mg/L Fe
257 Entire range 0.010 0.023 mg/L Fe