The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2008
Filed:
Jan. 28, 2005
Emiko Kaneko, Miyagi, JP;
Junichi Isoe, Miyagi, JP;
Makoto Satoda, Tokyo, JP;
Ryozo Goto, Tokyo, JP;
Shinichi Akazawa, Tokyo, JP;
Emiko Kaneko, Miyagi, JP;
Junichi Isoe, Miyagi, JP;
Makoto Satoda, Tokyo, JP;
Ryozo Goto, Tokyo, JP;
Shinichi Akazawa, Tokyo, JP;
Tohoku Techno Arch Co., Ltd., Miyagi, JP;
DKK-TOA Corporation, Tokyo, JP;
Abstract
A method and an apparatus are provided for measuring trace ingredients in water, which make it possible to perform detection and quantitative determination of silica, phosphorus or arsenic in a sample solution. The method includes adding a molybdate ion to a sample solution under an acidic condition, then adding a fluorescent counter cationic pigment thereto, and measuring the time required for the fluorescence emitted by the resultant solution to be attenuated to a prescribed intensity. The measuring apparatus includes an excitation light source which irradiates excitation light to the above-modified solution; a fluorescence detector which detects the fluorescence emitted by the solution; means for measuring the time required for the fluorescence detected by the fluorescence detector to be attenuated to a prescribed intensity; and control means for determining the concentration of silica, phosphorus or arsenic in the sample solution from the time measurement.