Phosphate by Thermometric Titration
Determination of phosphate in fertilizer and in mouthwash using magnesium nitrate
This application note describes the determination of phosphate in MAP fertilizer and in Mouthwash thermometrically using Mg(NO3)2 as titrant and the Thermotrode™.
Background
Phosphate is the conjugated base of phosphoric acid and is naturally occurring form of element phosphorus Phosphate ions have spread their roots in various industrial applications namely fertilizer, feed, food, detergents, personal hygiene, and construction, etc. As there is rapidly increase in demand for industrial phosphate, the needs for fast and reliable phosphate determination become more and more important.
The current application is a titrimetric adaptation of a classical gravimetric procedure. Here titration of phosphate ions with a magnesium nitrate, Mg(NO3)2 solution produces an insoluble precipitate of MgNH4PO4 at alkaline pH. The formation of insoluble MgNH4PO4 is a strong exothermic reaction that is monitored by thermometric titration.
This method is developed using an Excellence Titrator with the Thermotrode™, suitable for the measurement of small temperature differences induced by the chemical reaction.
The Application Includes:
- Introduction
- Sample Preparation and Procedures
- Chemistry
- Instruments and Accessories
- Method in Detail
- Results and Remarks
And method files (.lmt and .xml) for direct import and implementation on the instrument
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