Iron
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Methods
Iron (total & soluble; total & ferrous)
proportion to the iron concentration.
References: APHA Standard Methods, 20
th
ed., pp. 3-
The method expresses total iron content in units of
76, Method 3500-Fe B (1998). ASTM D 1068-77, Iron in
mg/L. By simply dividing the measured mg/L by the
Water, Test Method A.
density of the brine expressed in units of kg/L, the ppm
Iron is present in nature in the form of its oxides, or in
value can be obtained in mg/kg.
combination with silicon or sulfur. The soluble iron
content of surface waters rarely exceeds 1 mg/L, while
ground waters often contain higher concentrations.
The National Secondary Drinking Water Standard for
Visual Kits
iron is 0.3 mg/L, as iron concentrations in excess of 0.3
Range: 0-1 &1-10 ppm
mg/L impart a foul taste and cause staining. High con-
MDL: 0.05 ppm / Method: Phenanthroline
centrations in surface waters can indicate the presence Cat#
of industrial effluents or runoff.
Iron (total & ferrous) CHEMets Kit K-6210
With the CHEMetrics tests, ferrous iron reacts with
CHEMets Refill, 30 ampoules R-6201
1,10-phenanthroline to form an orange-colored
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-6000
1
chelate. To determine total iron, thioglycolic acid solu-
Low Range Comparator, Shelf-life 2 years:
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm C-6001
tion is added to reduce ferric iron to the ferrous state.
High Range Comparator, Shelf-life 2 years:
The reagent formulation minimizes interferences from 1, 2, 3, 4, 5, 6, 7, 8, 10 ppm C-6010
various metals. Results are expressed as ppm (mg/L) Fe. Kit comes in a plastic case and contains everything needed to perform
30 tests: Refill, Low and High Range Comparators, Activator Solution, 25 mL
sample cup, instructions, and MSDS.
Iron (total)
Reference: J. A. Tetlow and A. L. Wilson,
Range: 0-1 &1-10 ppm
“Determination of Iron in Boiler Feedwater,” Analyst,
MDL: 0.05 ppm / Method: Phenanthroline
1958. Cat#
CHEMetrics’ colorimetric method for determining total
Iron (total & soluble) CHEMets Kit K-6010
iron uses thioglycolic acid to dissolve particulate iron
CHEMets Refill, 30 ampoules R-6001
and to reduce iron from the ferric to the ferrous state.
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-6000
1
Ferrous iron then reacts with PDTS (3-(2-pyridyl)-5,6-
Low Range Comparator, Shelf-life 2 years:
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm C-6001
bis(4-phenylsulfonic acid)-1,2,4-triazine disodium salt)
High Range Comparator, Shelf-life 2 years:
in acid solution to form a purple-colored chelate.
1, 2, 3, 4, 5, 6, 7, 8, 10 ppm C-6010
Results are expressed as ppm (mg/L) Fe.
Kit comes in a plastic case and contains everything needed to perform
30 tests: Refill, Low and High Range Comparators, Activator Solution, 25 mL
sample cup, instructions, and MSDS.
Iron in Brine
Reference: D. F. Boltz and J. A. Howell, eds.,
Range: 0-30 & 30-300 ppm
Colorimetric Determination of Nonmetals, 2
nd.
ed., MDL: 5 ppm / Method: Phenanthroline
Vol. 8, p. 304 (1978).
Cat#
Iron contamination in oil field brines are typically a
Iron (total & soluble) VACUettes Kit K-6010D
result of corrosion processes of iron-containing metallic
VACUettes Refill, 30 ampoules R-6001D
components and equipment. Accumulation of insoluble
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-6000
1
iron salts in a brine completion fluid can result in sub- Low Range Comparator, Shelf-life 2 years:
stantial formation damage and can significantly affect
0, 5, 7.5, 10, 15, 20, 25, 30 ppm C-6001D
the productivity of an oil well. Quantifying total iron
High Range Comparator, Shelf-life 2 years:
30, 60, 90, 120, 150, 175, 200, 250, 300 ppm C-6010D
in brine is critical.
Kit comes in a plastic case and contains everything needed to perform
The Iron in Brine test method employs the ferric
30 tests (except distilled water): Refill, Low and High Range Comparators,
Activator Solution, dilutor snapper cup, micro test tube, 5 mL sample cup
thiocyanate chemistry. In an acidic solution, hydrogen
and top, instructions, and MSDS.
peroxide oxidizes ferrous iron. The resulting ferric iron
reacts with ammonium thiocyanate forming a red-
orange colored thiocyanate complex, in direct
49
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