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DR/2400
Method 8365
Powder Pillows
Scope and Application:
* Adapted from G. Frederick Smith Chemical Co., The Iron Reagents, 3rd ed. (1980)
Tips and Techniques
• 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
instrument manual for more information on Running a Reagent Blank.
• If the sample contains high levels of molybdate (100 mg/L MoO
blank.
Powder Pillows
Hach Programs
1.
Touch
.
Hach Programs
Select program
.
275 Iron, FerroMo
Touch
.
Start
IronTot_PP_Other_FMO_Eng_Ody.fm
For cooling water containing molybdate-based treatment
2.
Fill a 50-mL
graduated mixing
cylinder with 50 mL of
sample.
2–
or greater), read the sample immediately after zeroing the
4
3.
Add the contents of
one FerroMo Iron
Reagent 1 Powder Pillow
to the graduated mixing
cylinder. Stopper.
Iron, Total
FerroMo Method*
(0.01 to 1.80 mg/L)
.
See the
Method 8365
4.
Invert several times
to dissolve the reagents
(the prepared sample).
Iron, Total
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