Lamotte SMART3 Colorimeter User Manual download pdf (Page 199)

IRON

I,I0-PHENANTHROLINE METHOD • CODE 3668-SC

QUANTITY CONTENTS CODE

15 mL *Acid Phenanthroline Indicator *2776-E

5 g *Iron Reducing Reagent *2777-C

1 Spoon, 0.1 g, plastic 0699

*WARNING: Reagents marked with an * are considered to be potential health

hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents

go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,

phone or fax..

Most natural waters contain some iron. Its presence may vary from small traces

to very large amounts in water which is contaminated by acid mine wastes.

For domestic use, the concentration should not exceed 0.2 ppm and for some

industrial applications not even a trace of iron can be tolerated. There are many

means available for removing or reducing the iron content. Water softening resins

are effective for removing small amounts of iron and special ion exchange materials

are selective for iron removal. High concentrations of iron can be removed by such

chemical processes as oxidation and lime or lime-soda softening. Because of the

many means of removing or reducing the amount of iron in water, the particular

method employed will depend largely on the form of iron which is present and the

end use of the treated water.

APPLICATION: Drinking, surface and saline waters; domestic and

industrial wastes.

RANGE: 0.00–5.00 ppm Iron

MDL: 0.06 ppm

METHOD: Ferric iron is reduced to ferrous iron and subsequently

forms a colored complex with phenanthroline for a

quantitative measure of total iron.

SAMPLE HANDLING

& PRESERVATION

The sample container should be cleaned with acid and

rinsed with deionized water. Addition of acid to adjust the

sample to pH 2–3 will prevent deposition of iron on the

container walls. Samples should be analyzed as soon

as possible after collection since ferrous iron undergoes

oxidation to ferric iron.

INTERFERENCES: Strong oxidizing agents, cyanide, nitrite, and phosphates,

chromium, zinc in concentrations exceeding 10 times

that of iron; cobalt and copper in excess of 5 mg/L, and

nickel in excess of 2 mg/L. Bismuth, cadmium, mercury, ,

and silver precipitate phenanthroline.

SMART3 Test Procedures 11.10 IRON, Total, Ferrous, Ferric

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 199

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