YSI 9300 Photometer - Manual (Page 121)

Test Procedure
1 Filter sample through a GF/B filter paper.
2 Fill a test tube with filtered sample to the 10 ml mark.
3 Fill a test tube with deionised water to the 10 ml mark and retain for use as
the BLANK tube.
4 Select Phot 47 on photometer.
5 Take photometer reading in usual manner (see photometer instructions) using
the deionised water as the blank.
6 The result is displayed as mg/l Pt.
Note
Samples, which contain metallic impurities, dyestuffs or other industrial pollutants,
may exhibit a different color to the natural yellow-brown coloration. This test may
not be suitable for samples of this type.
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