Title:
TOTAL PHOSPHOROUS QUANTITY DETERMINATION METHOD
Document Type and Number:
WIPO Patent Application WO/2012/014346
Kind Code:
A1
Abstract:
The disclosed method determines the total phosphorous quantity in test water safely and in a short time period by breaking down phosphorous compounds included in test water and converting to phosphate ions, and then determining the quantity of phosphate ions in the test water. In the method, first sulfuric acid and alkali metal salts of peroxodisulfuric acid are added to test water, and the mixture is heated for a prescribed time period at a temperature from 65˚C to boiling temperature. A colour former formed from an aqueous solution is added to the test water, said aqueous solution containing at least one hydroxyl group-containing compound selected from the hydroxyl group-containing compound group consisting of hydroxyl carboxylic acids and alditol, a vanadium compound having a vanadium valence of 3-5, a non-reducing oligosaccharide capable of generating a 5 carbon aldose, a 6 carbon aldose or a 6 carbon ketose by means of decomposition, and a 7-molybdic acid 6-ammonium, and after heating the test water to at least 65˚C for a prescribed time period, the light absorbance of the test water for an arbitrary wavelength occurring in the range of 600-950nm is measured.
Inventors:
ISHII HIROSHI (JP)
Application Number:
PCT/JP2011/000460
Publication Date:
February 02, 2012
Filing Date:
January 28, 2011
Export Citation:
Assignee:
MIURA KOGYO KK (JP)
ISHII HIROSHI (JP)
ISHII HIROSHI (JP)
International Classes:
G01N31/00; G01N33/18
Foreign References:
| JP2004093509A | 2004-03-25 | |||
| JPS58180949A | 1983-10-22 | |||
| JPH11237373A | 1999-08-31 | |||
| JP2004257916A | 2004-09-16 | |||
| JPS533391A | 1978-01-13 | |||
| JPS56110050A | 1981-09-01 |
Other References:
KAZUO KUGA ET AL.: "Indirect Determination of Phosphorus by Graphite Furnace Atomic Absorption Spectrometry of Antimony and Molybdenum", JOURNAL OF JAPAN SOCIETY FOR ANALYTICAL CHEMISTRY, vol. 30, no. 3, 5 March 1981 (1981-03-05), pages 164 - 169
SHINGO FUJITA ET AL.: "Interference from chlorine and its elimination on the determination of total phosphorus in sea water by the peroxodisulfate digestion/molybdenum blue method", JOURNAL OF JAPAN SOCIETY FOR ANALYTICAL CHEMISTRY, vol. 53, no. 9, 5 September 2004 (2004-09-05), pages 1045 - 1049
EIKO NAKAMURA ET AL.: "Heating effects on sample decomposition by peroxodisulfate for determination of total phosphorus in water", JOURNAL OF JAPAN SOCIETY FOR ANALYTICAL CHEMISTRY, vol. 35, no. 12, 5 December 1986 (1986-12-05), pages 124 - 129
KAZUKO MATSUMOTO ET AL.: "Formation of Molybdenum Blues and Its Application to Determination of Phosphorus (Kagaku eno Shotai)", CHEMICAL EDUCATION, vol. 35, no. 5, 20 October 1987 (1987-10-20), pages 420 - 423
SHINGO FUJITA ET AL.: "Interference from chlorine and its elimination on the determination of total phosphorus in sea water by the peroxodisulfate digestion/molybdenum blue method", JOURNAL OF JAPAN SOCIETY FOR ANALYTICAL CHEMISTRY, vol. 53, no. 9, 5 September 2004 (2004-09-05), pages 1045 - 1049
EIKO NAKAMURA ET AL.: "Heating effects on sample decomposition by peroxodisulfate for determination of total phosphorus in water", JOURNAL OF JAPAN SOCIETY FOR ANALYTICAL CHEMISTRY, vol. 35, no. 12, 5 December 1986 (1986-12-05), pages 124 - 129
KAZUKO MATSUMOTO ET AL.: "Formation of Molybdenum Blues and Its Application to Determination of Phosphorus (Kagaku eno Shotai)", CHEMICAL EDUCATION, vol. 35, no. 5, 20 October 1987 (1987-10-20), pages 420 - 423
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