YSI 9300 Photometer - Manual (Page 73)

PHOTOMETER TEST INSTRUCTIONS
_________________________________________________________________________________________
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 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 HR test provides a simple test for the determination
of high levels of iron in water over the range 0 - 10 mg/l Fe. The test responds to
both ferrous and ferric iron and thus gives a measure of the total iron content of
the water.
Method
The YSI Iron HR test is based on a single tablet reagent containing an alkaline
thioglycollate. The test is carried out simply by adding a tablet to a sample of
the water under test. The thioglycollate reduces ferric iron to ferrous iron and
this, together with any ferrous iron already present in the sample, reacts to give
a pink coloration.
The intensity of the color produced is proportional to the iron concentration and
is measured using a YSI Photometer.
Reagents and Equipment
YSI Iron HR Tablets
YSI 9300 or 9500 Photometer
Round Test Tubes, 10 ml glass (PT 595)
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 10 mg/l
PHOT.19.AUTO