Does Hach have a ferrous iron standard?

Document ID

Document ID TE329

Published Date

Published Date 27/05/2017
Question
Does Hach have a ferrous iron standard?
Summary
Ferrous iron standard
Answer
Hach does not have a ferrous iron standard because the solution would not be stable.  Users can prepare a standard from dry Ferrous Ammonium Sulfate hexahydrate (Hach catalog number 1125614) that can be used to create a standard. Follow the instructions below:

o Prepare a 100 mg/L Fe2+ ferrous iron stock solution as follows:
o Dissolve 0.7022 grams of Ferrous Ammonium Sulfate, hexahydrate, in deionized water.
o Dilute to one liter in a Class A volumetric flask.
o In a 100 mL Class A volumetric flask, dilute 2.00 mL of this solution to 100 mL with deionized water to make a 2.0 mg/L standard solution. Prepare this solution immediately before use.