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Overview
Phosphate
Measuring method
Citation forms
Application
Measuring system
8
1.2
Metrological basics PO4-P, PO4
The salts of the phosphoric acid are called phosphates. With simple phosphoric
acid (orthophosphoric acid, H
The Alyza IQ PO4 analyzer measures the concentration of orthophosphate in
an aqueous solution with the aid of the vanadate molybdate method (yellow
method).
The reagent contains an aqueous solution of ammonium monovanadate NH
VO
and ammonium heptamolybdate (NH
3
acid H
SO
. In an acidic environment, the chemical reaction takes place accord-
2
4
ing to the following molecular formula:
3-
-
PO
+ 2 VO
+ 10 MoO
4
3
The originally pale yellow reagent will turn a deep yellow. The change of absor-
bance is photometrically measured at a wavelength of 400 nm. From this, the
concentration of orthophosphate is calculated.
Phosphate concentration is quoted in milligrams per liter (mg/l). This value can
either refer to all orthophosphate ions or to the phosphorus atom included in
them. The values can be converted as follows:
1 mg/l P = 3.066 mg/l PO4
1 mg/l PO4 = 0.3261 mg/l P
Concentration values referring to the phosphorus atom are indicated by the ad-
dition PO4-P (citation form).
1.3
Product description
1.3.1 Overview
Analyzers of the Alyza IQ series are designed for online measurements in aque-
ous samples.
Variant
Alyza IQ PO4
Measurement takes place photometrically, at adjustable intervals, including au-
tomatic sampling (sample filtration and sample feed).
Analyzers of the Alyza IQ series are operated as "sensors" in the
PO
) this is orthophosphate (anion PO
3
4
)
Mo
4
6
2-
+
→ [PV
+ 20 H
4
2
Measurement
Orthophosphate measurements
e.g.
Measurements for regulation of precipitant dosing in
waste water treatment plants
Measurements in the final effluents of waste water
treatment plants
Measurements for water body and river monitoring
O
with an addition of sulfuric
7
24
5-
Mo
O
]
+ 10 H
O
10
40
2
ba76201d03
Alyza IQ PO4
3-
).
4
4-
05/2020
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