Total Phosphorus

Description

Phosphorus occurs in several forms: ortho, poly and organically bound. Further classification can be made on whether the phosphorus is dissolved (passing through a 0.45 micron filter). In TP oxidation / digestion, polyphosphates and organic phosphorus are converted into orthophosphate. Organic phosphorus is converted to orthophosphate by UV catalyzed persulfate digestion; polyphosphates are converted to orthophosphate by sulphuric acid digestion. All forms of phosphorus are converted to its ortho form in the TP procedure, in the presence of persulfate and an acid background. The Total Phosphorus concentration can be measured using two different methods depending on the range requested. Both methods use advanced photochemical oxidation, sulphuric acid, heat, UV irradiation and a chemical oxidizer (sodium persulfate). After the complete oxidation of the phosphorus in the sample to PO4, then a colorimetric reaction is performed and the intensity of the colour developed is proportional to the phosphate concentration present in the sample.
The determination ranges of the TP analyzer vary from trace ppb to 400 mg/L TP, using the (optional) external dilution module.

• SS external reservoir with level switch for dilution water
• Fast Loop external reservoir with level switch - polycarbonate
• SS External reservoir with level switch for sample
• Filtration unit 100 micron 230 VAC
• Sampling Pump