YSI 9300 Photometer - Manual (Page 71)

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 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 LR test provides a simple test for the determination
of low levels of iron in water over the range 0 - 1 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 LR test is based on a single tablet reagent containing 3-(2-Pyridyl)-
5, 6-bis(4-phenyl-sulphonic acid)-1, 2, 4-triazine (PPST) formulated with a
decomplexing/reducing agent in an acid buffer. The test is simply carried out by
adding a tablet to a sample of the water under test. The decomplexing/
reducing agent breaks down weakly complexed forms of iron, and converts the
iron from the ferric to the ferrous form. The ferrous iron reacts with PPST to
form a pink coloration.
The intensity of the color produced is proportional to the iron concentration and
is measured using a YSI Photometer.
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 1.0 mg/l
PHOT.18.AUTO