YSI 9300 Photometer - Manual (Page 107)

PHOTOMETER TEST INSTRUCTIONS
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Iron occurs widely in nature and is found in many natural and treated waters.
Iron is an objectionable constituent in both domestic and industrial water
supplies. The presence of iron affects the taste of beverages and causes
unsightly staining of laundered clothes, plumbing fittings, swimming pool
surfaces and the like. The formation of insoluble iron deposits is troublesome in
many industrial applications and in the agricultural water uses such as drip feed
irrigation. In industry iron salts occur through corrosion of plant and equipment,
and from industrial processes.
Iron is therefore an important test for the monitoring of natural and drinking
waters, for corrosion control in industry and for the checking of effluents and
waste waters. The YSI Iron MR test provides a simple test for the determination
of both ferrous and ferric iron. It is capable of dissolving colloidal and particulate
iron and thus gives a measure of the total iron content of the water.
Method
In the YSI Iron MR method iron is reduced to the ferrous form and then reacted
with 1,10-phenanthroline to form an orange colored complex. A decomplexing
agent is incorporated into the reagent system in order to break down complexed
forms of iron. The test is simply carried out by adding tablet reagents to a
sample of the water under test.
The intensity of the color produced is proportional to the iron concentration and
is measured using a YSI Photometer.
Interference can occur in industrial waters treated with molybdate and nitrite
based treatment products. A supplementary reagent can be used to prevent this
interference.
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 5.0 mg/l
PHOT.39.AUTO