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 (8-4-1, Habikigaoka Habikino-sh, Osaka 64, 〒5830864, JP)
Application Number:
JP2011/000460
Publication Date:
February 02, 2012
Filing Date:
January 28, 2011
Export Citation:
Assignee:
MIURA CO., LTD. (7 Horie-cho, Matsuyama-shi Ehime, 96, 〒7992696, JP)
三浦工業株式会社 (〒96 愛媛県松山市堀江町７番地 Ehime, 〒7992696, JP)
三浦工業株式会社 (〒96 愛媛県松山市堀江町７番地 Ehime, 〒7992696, JP)
International Classes:
G01N31/00; G01N33/18
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Claims:
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