Tests For: High Levels of Phosphate in Boiler Water
Tests Range: 0–100 mg/L
Reagent Chemistry Used: Vanadomolybdophosphoric acid
Basis of Test Method: Standard Method 4500-P-C
Method Detection Limit*: 1 mg/L
Limit of Quantification**: 3 mg/L
Phosphates are extensively used for treating water in boilers and steam raising plant. Phosphates are added to control the deposition of sediment and deposits within the boiler. It is an essential part of the treatment programme to monitor the phosphate level to ensure this is within the correct range of deposition control.
The Palintest Phosphate HR test provides a simple method of measuring phosphate levels in boiler waters over the range 0–100 mg/l PO4.
The Palintest Phosphate HR test is based on the Vanadomolybdate method. The test is carried out simply by adding a single tablet to a sample of the boiler water.
In the test phosphates react with ammonium molybdate, in the presence of ammonium vanadate, to form the yellow phosphovanadomolybdate. The intensity of the colour produced in the test is proportional to the phosphate concentration and is measured using a Palintest Photometer.
A supplementary tablet may be optionally used for the removal of Silica interference.