DR/2400
Iron, Total
IronTot_PP_Other_FMO_Eng_Ody.fm Page 1 of 4
• Digestion is required for total iron determination. See the Hach Water Analysis Handbook for digestion procedures.
• Rinse glassware with a 1:1 hydrochloric acid solution. Rinse again with deionized water. These two steps will remove iron
deposits that can cause slightly high results.
• After the addition of the reagent, the sample pH should be between 3–5.
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust
. See the
instrument manual for more information on Running a Reagent Blank.
• If the sample contains high levels of molybdate (100 mg/L MoO
4
2–
or greater), read the sample immediately after zeroing the
blank.
Iron, Total
Method 8365
FerroMo Method*
* Adapted from G. Frederick Smith Chemical Co., The Iron Reagents, 3rd ed. (1980)
Powder Pillows
(0.01 to 1.80 mg/L)
Scope and Application: For cooling water containing molybdate-based treatment
1. Touch
Hach Programs.
Select program
275 Iron, FerroMo.
Touch
Start.
2. Fill a 50-mL
graduated mixing
cylinder with 50 mL of
sample.
3. Add the contents of
one FerroMo Iron
Reagent 1 Powder Pillow
to the graduated mixing
cylinder. Stopper.
4. Invert several times
to dissolve the reagents
(the prepared sample).
Tips and Techniques
Powder Pillows Method 8365
Hach Programs
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