Iron
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 IronTot_None_Other_FVR_Eng_Ody.fm
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2. Use the TenSette
®
pipet to add 0.2, 0.4, and 0.6 mL of standard to three 50-mL
samples, respectively.
3. Analyze each sample as described above. The iron concentration should
increase 0.1 mg/L for each 0.2 mL of 25-mg/L standard added.
See Section 3.2.2 Standard Additions on page 32 for more information.
Standard Solutions Method
Prepare a 1.0 mg/L iron working solution as follows:
1. Pipet 5.00 mL of iron standard solution, 100-mg/L Fe, into a 500-mL
volumetric flask.
2. Dilute to volume with deionized water. Prepare this solution daily. Analyze
the working solution according to the above procedure.
Method Performance
Precision
Standard: 1.000 mg/L Fe
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
The FerroZine
®
Iron Reagent forms a purple colored complex with trace
amounts of iron in samples that are buffered to a pH of 3.5. This method is
applicable for determining trace levels of iron in chemical reagents and glycols
and can be used to analyze samples containing magnetite (black iron oxide) or
ferrites. The test results are measured at 562 nm.
Required Apparatus
Quantity Required
Description Per Test Unit Cat. No.
Cylinder, graduated, 50-mL, poly .................................................................................... each......................1081-41
Dispenser, Fixed Volume, 1.0-mL, Repipet Jr. ................................................................ each....................21113-01
Flask, Erlenmeyer, PMP w/cap, 125-mL...............................................2 ....................... each....................20898-43
Pour-Thru Cell Kit.............................................................................................................. each....................59404-00
Required Standards
FerroZine
®
Iron Reagent Solution.................................................................................... 500 mL.................2301-49
Iron Standard Solution, 100-mg/L Fe.............................................................................. 100 mL...............14175-42
Iron Standard Solution, Voluette
®
ampule, 25-mg/L Fe, 10-mL................................. 16/pkg...............14253-10
Water, deionized ................................................................................................................. 4 L ..........................272-56
Program 95% Confidence Limits of Distribution
260 0.990–1.010 mg/L Fe
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.009 mg/L Fe
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