Lovibond Tintometer MD 100 Manual De Instrucciones página 63

Phosphate LR T / M320
Phosphate LR T
0.02 - 1.3 mg/l P
Phosphomolybdenum Blue
Material
EN
Required material (partly optional):
Reagents
Phosphate No. 1 LR
Phosphate No. 2 LR
Phosphate No. 2 LR
Set Phosphate No. 1 LR/No. 2 LR 100 Pc.
Preparation
1. Strongly buffered samples or samples with extreme pH values should be adjusted
to between pH 6 and pH 7 before the analysis (use 1 mol/l Sulphuric acid or 1 mol/l
Sodium hydroxide).
2. Ortho-Phosphate ions react with the reagent to form an intense blue colour.
Phosphate, which is found in organic and condensed, inorganic (meta-, pyro- and
polyphosphate) forms, must therefore be converted into ortho-phosphate ions prior to
analysis. The pretreatment of the sample with acid and heat creates the conditions for
the hydrolysis of the condensed, inorganic forms. Organically bound phosphate can
be converted into ortho-phosphate ions by heating with acid and Persulphate.
The amount of organically bound phosphate can be calculated:
mg/l organic Phosphate = mg/l Phosphate, total - mg/l Phosphate, can be hydrolysed
in acid.
Notes
1. Only ortho-phosphate ions react.
2. The tablets must be added in the correct sequence.
64
Packaging Unit
Tablet / 100
Tablet / 100
Tablet / 250
100 each
#
EN Method Reference Book 1.0
M320
PO4
Part Number
513040BT
513050BT
513051BT
517651BT