TM 5-6630-215-12
(a) Fill a graduated cylinder with the water to be analyzed to
the 25 ml mark.
Pour into a sample cell.
(b) To the contents of this cell add one ferrous iron test
reagent powder pillow and swirl to mix.
(c) Allow the solution to stand 2 minutes. If iron is present,
an orange color will develop.
Proceed to step (d) while waiting.
(d) Fill the second clean sample with the original sample water
and place it into the cell holder.
Insert the Iron (Ferrover Method)
Metal Scale into the meter and adjust the wavelength dial to 510 nm.
Adjust the light control for a meter reading of O mg/1.
(e) Replace this blank sample with the prepared sample (step
(c)) in the cell holder and read the mg/1 ferrous (Fe++) iron on the
meter scale.
c. Iron, total and Ferric (Fe+++)
(fig. 2-11,
- 1, 10-Phenanthroline Method
2-12 and para 2-18).
(1) Iron in Water (para 2-19b).
(2) Iron, total. Test Procedure.
(a) Fill a graduated cylinder with the water to be analyzed to
the 25 ml mark.
Pour into a clean sample cell.
(b) Add the contents of one Ferrover reagent test powder pillow
to the sample, swirl and mix. Let the sample stand 2 minutes and more
than 10 minutes to allow the color to develop.
(c) Fill a clean sample cell with original sample water (step
(a)) and place it in the cell holder.
Insert the Iron (Ferrover method)
meter scale in the meter and adjust the wavelength dial to 510 nm.
Adjust the light control for a meter reading of O mg/1.
(d) Replace this blank sample with the prepared sample (step
(c)) in the cell holder and read the Total Iron (in mg/1) on the meter
scale.
(3) Iron, Ferric (Fe+++)
- by subtracting the Ferrous (Fe++) Iron
Value from the total Iron Value, the Ferric (Fe+++) Iron Value in mg/L
is obtained.
NOTE
To extend the range of the test a sample dilution
is necessary (para 2-10a and table 2-1).
2-44
Change 1
