Manual

Test Instructions

1 Fill test tube with sample to the 10 ml mark

2 Add one Silica No 1 tablet, crush and mix to dissolve. Stand for five minutes to

allow the silica to react.

3 Add one Silica PR tablet, crush and mix to dissolve. (This stage may be

omitted if the sample is known to be completely free of phosphate).

4 Add one Silica No 2 tablet, crush and mix to dissolve. Stand for one minute

to allow full color development.

5 Select Phot 31 on photometer.

6 Take photometer reading in usual manner (see photometer instructions).

7 The result is displayed as mg/l SiO

Note

For testing high levels of Silica the YSI Silica HR test should be used. The range

of this test is 0 - 100 mg/l (see Test Instruction Phot 56).

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