||The determination of pH by flow injection analysis and by fiber optrode analysis /
Pia, Stephen H., ;
Waltman, D. P. ;
Hillman, D. C.
||Lockheed Engineering and Management Services Co., Inc., Las Vegas, NV.;Environmental Monitoring Systems Lab., Las Vegas, NV.
|| U.S. Environmental Protection Agency, Office of Research and Development, Environmental Monitoring Systems Laboratory ; Distributed by the National Technical Information Service,
||EPA 600-4-88-026; 68-03-3249; EPA-68-03-3249
Hydrogen-ion concentration--Measurement. ;
Flow injection analysis. ;
Colorimetric analysis ;
Chemical analysis ;
Ground water ;
Surface waters ;
Acid deposition ;
Water pollution detection ;
Flow injection analysis ;
Fiber optrode analysis
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||ix, 45 pages : illustrations ; 28 cm
Two new procedures for measuring pH have been developed. The first measures pH colorimetrically using a proprietary indicator dye mixture in a flow injection analysis (FIA) procedure. The second measures pH using a fiber optic chemical sensor (FOCS) specifically developed for pH determinations. The FOCS method measures pH by monitoring the fluorescence of a fluorescein derivative bonded to the distal end of a fiber optic cable called an optrade. The FIA method currently has a precision and accuracy of about + or - 0.2 pH units and can measure 100 samples/hour. The FOCS method has a precision of + or - 0.05-0.20 pH units and an accuracy of + or - 0.1 to 0.6 pH units. About 10 to 60 samples can be analyzed. The characteristics of the FOCS Method will vary significantly with individual optrodes. The experimental results indicate that either flow injection analysis or fiber optic chemical sensor analysis could form the basis for an alternative to electrometric measurement of pH in certain circumstances.
"July 1988." "EPA 600-4-88-026." "Contract number 68-03-3249." "Project officer Edward M. Heithmar." "Pre-Issuance copy." Includes bibliographical references (pages 29-30, 44).