Methods for determination of total phosphorus

摘要

PROBLEM TO BE SOLVED: To safely and quickly quantify the total phosphorus in sample water.;SOLUTION: In a method which quantifies the total phosphorus in sample water by decomposing a phosphorus compound contained in the sample water to convert the phosphorus compound into phosphate ions and quantifying the phosphate ions in the sample water, the sample water is added with an alkali metal salt of an peroxodisulfuric acid and a sulfuric acid and is heated at a temperature between 65°C and a boiling temperature for a predetermined period of time. After that, the sample water is added with a first aqueous solution containing a saccharide selected from an aldose with 5 carbon atoms, an aldose with 6 carbon atoms, a ketose with 6 carbon atoms, and an oligosaccharide and is heated. Next, the sample water is added with the oligosaccharide, an ammonium molybdate, and an antimony compound of a trivalent antimony and is maintained at a temperature of 65°C or higher, and then an absorbance of an arbitrary wavelength in a range between 600 to 950 nm is measured with respect to the sample water. A type of oligosaccharide available in this process can generate the aldose with 5 carbon atoms and the ketose with 6 carbon atoms by decomposition.;COPYRIGHT: (C)2012,JPO&INPIT