YSI 9300 Photometer - Manual (Page 54)

Test Instructions
1 Rinse test tube with sample leaving two or three drops of sample in the tube.
2 Add one DPD No 4 tablet, crush tablet and then fill the test tube with sample
to the 10 ml mark. Mix to dissolve tablet.
3 Wait two minutes to allow full color development in the sample.
4 Select Phot 8 on photometer.
5 Take photometer reading.
6 The result represents the total chlorine as milligrams per litre.
Notes: This test will display the total of all oxidizers present in the sample. This
includes chlorine, chlorine dioxide, bromine and ozone.
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