YSI 9300 Photometer - Manual (Page 78)

TEST PROCEDURE
1 Using the measuring syringe take a 1 ml sample of the water under test.
Transfer to the round test tube and make up to the 10 ml mark with
deionised water.
2 Add one Magnecol tablet, crush and mix to dissolve.
3 Stand for five minutes to allow full color development and the slight turbidity
to clear.
4 Select Phot 21 on photometer for result as mg/l Mg. Select Phot 61 for result
as magnesium hardness, mg/l CaCO
3
.
5 Take photometer reading in usual manner (see photometer instructions).
Note: To convert mg/l Mg to magnesium hardness as CaCO
3
, multiply by 4.2.
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