Iron – LaMotte DC1600 Colorimeter User Manual

Page 45

IRON

BIPYRIDYL METHOD

CODE 3648

QUANTITY

CONTENTS

CODE

30 mL

*Iron Reagent #1

*V-4450-G

5 g

*Iron Reagent #2

*V-4451-C

Pipet, 0.5 mL, plastic

0353

Spoon, 0.1 g, plastic

0699

*WARNING: Reagents marked with a * are considered hazardous substances. Material Safety Data Sheets (MSDS) are supplied for

these reagents. For your safety, read label and accompanying MSDS before using.

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 – 5.0 ppm Iron

METHOD:

Ferric iron is reduced to ferrous iron and subsequently forms a colored complex with bipyridyl

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.

INTERFERENCES:

Strong oxidizing agents interfere, as well as copper and cobalt in excess of 5.0 mg/L.