Automated system for total phosphorus in waste waters by flow injection analysis.

Trace and ultratrace analysis methods for the determination of phosphorus by flow-injection techniques

“…The molybdenum blue method can be applied to the total phosphorus determination after the decomposition of organic and inorganic phosphorus compounds, organic and inorganic condensed phosphorus compounds, and solid and dissolved phosphorus compounds to orthophosphate by heating at high temperature (120-160 • C) [59,60], at high temperature with a platinum wire in a reaction coil [61], or by irradiating UVlight to aqueous samples containing persulfate [47,55]. By using a reaction coil, which is wound on two low-pressure mercury lamps (14 mm o.d., 134 mm length, 4 W germicidal use), most organic phosphorus compounds were decomposed to orthophosphate at 70 • C: LOD was 1 g/l of phosphorus at 830 nm [55].…”

On-Line Photo-Oxidative Decomposition of Phosphorus Compounds to Orthophosphate and Its Application to Flow Injection Spectrophotometric Determinations of Total Phosphorus in River and Waste Waters

“…However, they involved the use of high temperatures (120 -160˚C), increased pressures and long tubing reactors. [9][10][11] These decomposition procedures caused some problems such as experimental danger, long analysis times or endurance of flow injection systems. Moreover, it took about 1 h for the decomposition temperature to reach about 150˚C and for the heating block to cool to room temperature after analysis.…”

A Novel Method for the On-Line Room-Temperature Hydrolysis of Hydrophobic Organic Phosphates Using a Cooperative Action of Sodium Dodecyl Sulfate, Acid and UV-Irradiation

“…Organic phosphates are usually determined by a phosphomolybdic acid reaction after conversion to orthophosphates. Some methods have been reported for the on-line decomposition of organic phosphates using cobalt(III) oxidation 1 , peroxodisulfate digestion 2,3 , enzymatic dephosphorylation 4 , and oxidative decomposition with light 5,6 and microwaves. 7,8 We also reported on the on-line hydrolysis of organic phosphates by sulfuric acid 9 and its application [10][11][12] to their determination.…”