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5
TROUBLESHOOTING
Chemistry Troubleshooting
It is very important to specify Palintest Photometer
Grade tablets when ordering replacement reagents
for this instrument. Using an alternative grade of
tablet may lead to a turbid sample which in turn
leads to inaccurate results.
Ozone Method
Ozone, free and combined chlorine and bromine
residuals all react with DPD No 4 reagent to produce a
pink colour, proportional to the concentration present
in the sample.
Glycine destroys ozone in the sample and the colour
produced in the DPD test then corresponds to the
chlorine and bromine only.
The ozone content is thus obtained by the difference
between the test readings with and without glycine.
Procedure
1
Rinse test tube with sample leaving 2 - 3 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 the tablet.
17
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