1.1 Methods
Notes:
1. Only ortho-Phosphate ions react.
2. The tablets must be added in the correct sequence.
3. The test sample should have a pH-Value between 6 and 7.
4. Interferences:
Higher concentrations of Cu, Ni, Cr (III), V (V) and W (VI) interfere due to their colour.
Silicates do not interfere (masked by Citric acid in the tablets).
5. see also page 145
6. Conversion:
mg/l P = mg/l PO
4
x 0.33
mg/l P
2
O
5
= mg/l PO
4
x 0.75
7.
PO
4
P
P
2
O
5
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