20
Calcium Hardness
Range: 5 – 500 mg/l
Wavelength – 575 nm
Method – Indicator
1
Fill test tube with sample to the 10 ml mark.
2
Add one Calcicol No 1 tablet, crush and mix to dissolve.
3
Add one Calcicol No 2 tablet, crush and mix to dissolve.
4
Stand for
two minutes
.
5
Take the photometer reading.
Reagents
AP 252 – Calcicol No 1 and No 2 Tablets
Notes
•
The Calc NaCl setting is for salt pools only. This
requires
a
different
calibration
but
the
method
outlined for the standard Calcicol test is still valid.
•
Magnesium hardness (up to 200 mg/l as CaCO
3
) does
not interfere with the test.
•
Iron at levels above 10 mg/l may cause low results. Zinc
above 5 mg/l may cause high results.
21
Bromine
Range: 0.02 – 10 mg/l
Wavelength – 530 nm
Method – DPD
1
Rinse test tube with sample leaving a few drops of
sample in the tube.
2
Crush the DPD No 1 tablet in two or three drops of
the water sample until the tablet is thoroughly
crushed.
3
Add the 10 ml test solution, mix and seal the tube
with the cap.
4
Gently invert the tube to remove any bubbles from
the inner walls of the tube
5
Take the photometer reading.
Reagents
AP 011 – DPD No 1 Tablets