Chemistry: analytical and immunological testing – Including titration or ph determination
Patent
1997-08-06
1999-07-20
Drodge, Joseph W.
Chemistry: analytical and immunological testing
Including titration or ph determination
324438, 356319, 36452802, 422 55, 422 8209, 436164, G01N 2180, G01N 2100
Patent
active
059255722
ABSTRACT:
A pH sensor based upon spectrophotometric techniques has been developed for in situ analysis of an aqueous medium, e.g., surface seawater. This sensor utilizes a spectrophotometric pH indicator (Thymol Blue), which has been calibrated for use in seawater as a function of temperature and salinity. Shipboard spectrophotometric pH analyses routinely demonstrate a precision on the order of .+-.0.0004 pH units. In situ analysis of seawater pH has demonstrated a precision on the order of .+-.0.001 and an accuracy, using shipboard measurements as a standard, on the order of .+-.0.01. The sensor is a self-contained system that pumps seawater, meters in indicator, and spectrophotometrically determines indicator absorbance cells, each with three wavelength channels, to obtain the spectrophotometric absorbance. The sensor system, rated for depths up to 500 m, provides pH, conductivity, and temperature and can be operated via computer or in a standalone mode with internal data storage. The sensor utilizes less than 12 watts of power and is packaged in an aluminum housing.
REFERENCES:
patent: 5242602 (1993-09-01), Richardson et al.
patent: 5528363 (1996-06-01), Fachinger et al.
Byrne Robert H.
Jones Charles W.
Kelly John J.
Kolesar Joseph R.
Leader Bram
Drodge Joseph W.
University of South Florida
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