Summary Of Method - Hach POCKET COLORIMETER II Instruction Manual

Phosphites and
organophos-phorus
compounds
Silica
Silicate
Sulfate
Sulfide
Sulfite
Thiourea
Highly buffered samples
or extreme sample pH

Summary of Method

In the phosphonate procedure, a UV-catalyzed oxidation converts phosphonate to
orthophosphate. The orthophosphate is then quantified using the PhosVer 3
method.
React quantitatively. Meta- and polyphosphates do not
interfere.
500 mg/L
100 mg/L
2000 mg/L
Interferes at all levels
100 mg/L
10 mg/L
May exceed the buffering capacity of the reagents
and require sample pretreatment.
1—51
Phosphonates,
continued