Method and apparatus for controlling concentration of water...

Liquid purification or separation – Processes – Including controlling process in response to a sensed condition

Reexamination Certificate

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C210S745000, C210S746000, C210S749000, C210S143000, C210S198100

Reexamination Certificate

active

07105095

ABSTRACT:
A water-soluble lithium salt is added as a tracer substance along with a water treatment chemical to water to be treated. The concentration of lithium ions is electrochemically or optically measured using a lithium ion sensitive substance, so as to perform concentration control of the water treatment chemical added to water to be treated. An ion selective electrode, ion selective field effect transistor, or ion optode may be employed to perform the electrochemical or optical measurement using a lithium ion sensitive substance.

REFERENCES:
patent: 4992380 (1991-02-01), Moriarty et al.
patent: 6508921 (2003-01-01), Mu et al.
patent: 51-111388 (1976-10-01), None
patent: 60202875 (1985-10-01), None
patent: 2-115697 (1990-04-01), None
patent: 4-296651 (1992-10-01), None
patent: 4-296652 (1992-10-01), None
patent: 6-73045 (1994-03-01), None
patent: 2001-4585 (2001-01-01), None
patent: 2001-334255 (2001-12-01), None
Kazahiko Watanabe et al. “Lithium Ion Selective Optical Sensor Based on a Novel Neutral Ionophore and a Lipophilic Anionic Dye” Anal Chem. 1993, 65, 2704-2710.
Koji Suzuki et al, “Design and Synthesis of Highly Selective Ionophores for Lithium on Based on 14-Crown-4 Derivatives for an Ion-Selective Electrode” Anal Chem. 1993, 65, 3404-3410.
English Abstract of Publication No. 2-115697 (1 page).
English Abstract of Publication No. 2001-334255 (1 page).
English Abstract of Publication No. 4-296651 (1 page).
English Abstract of Publication No. 4-296652 (1 page).
English Abstract of Publication No. 51-111388 (1 page).
English Abstract of Publication No. 6-73045 (1 page).
English Abstract of Publication No. 2001-4585 (1 page).

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