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Main Title Electrochemical Method for the Determination of Phosphate in Natural Water.
Author Co, James A. ; Lundquis, Gary L. ;
CORP Author Illinois Univ., Urbana. Water Resources Center.
Year Published 1972
Report Number UILU-WRC-72-0061; DI-14-31-0001-3013; OWRR-A-041-ILL; 04627,; A-041-ILL(1)
Stock Number PB-214 486
Additional Subjects ( Water analysis ; Inorganic phosphates) ; ( Water pollution ; Inorganic phosphates) ; Trace elements ; Electrodes ; Electrochemistry ; Oxidation ; Impurities ; Electrolysis ; Water pollution detection ; Voltammetry ; Cathodic stripping voltammetry
Library Call Number Additional Info Location Last
NTIS  PB-214 486 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 63p
A method is presented for the determination of trace quanities of phosphate in natural water which would be an improvement over the presently accepted spectrophotometric technique. The method involves cathodic stripping chronopotentiometry which was found to be an analytically sensitive technique. It is based upon the reversible oxidation of a metallic indicator electrode to an insoluble phosphate salt film. When copper is used as the indicator electrode, the detection limit is 10 ppb. The major drawback of the method is that under the electrolysis conditions employed, salt of mixed stoichiometry is deposited which subsequently results in two separate stripping steps. When mercury is the indicator electrode, the system approaches true Nernstian behavior. However, an observed interference of chloride ion has, to the present, limited application of the electrode to solutions containing phosphate in excess of 50 ppb.