Method for the determination of phenols in water

Details Method for the determination of phenols in water Method for the determination of phenols in water

1989-04-27

1990-04-03

Therkorn, Ernest G.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210656, 210659, 2101982, 210909, 436131, 436140, 436161, 436178, B01D 1508

Patent

active

049138219

ABSTRACT:
A chromatographic method for the determination of individual phenols in water by adding a halogenating agent to the water, e.g., using the bromate-bromide reaction to generate tribromide ions which react with the phenols to form bromo-derivatives of the phenols, then to permeate the bromo-derivatives across a membrane, e.g., a silicone rubber membrane, into a liquid extractant, e.g., a dilute aqueous solution of sodium hydroxide and acetonitrile, and then determining the permeated bromo-derivatives in the liquid extractant by chromatography, e.g., by injecting the liquid extractant containing the permeated bromo-derivatives into a reverse phase liquid chromatographic system. The use of a membrane is essential in the present invention because it allows the use of a high enough concentration of halogenating agent to completely halogenate most any sample and provides for the removal of the halo-derivatives from the halogenation reaction site before any substantial degradation of the halo-derivatives occurs from a relatively high concentration of halogenating agent. Total phenols as a group can be determined by modifying the method to use backflow liquid chromatography to eliminate potential interferences and to elute the halo-derivatives in a single chromatographic peak.

REFERENCES:
patent: 4775476 (1988-10-01), Melcher et al.
A-Standard Methods For the Examination of Water and Wastewater, 574-576, Published by the American Public Health Assoc., American Water Works Assoc. and Water Pollution Control Fed., (14th Ed.), (1976).
B-D. R. Knapp, Handbook of Analytical Derivatization Reactions, 29, published by John Wiley & Sons (1979).
C-D. A. Skoog, et al., Fundamentals of Analytical Chemistry, 469-471, published by Holt, Rinehart and Winston (1963).
D-Frei, et al., Chemical Derivatization in Analytical Chemistry, Chromatography 1m 53-54, published by Plenum Press (1981).
E-P. Jandera, et al., Gradient Elution in Column Liquid Chromatograph Theory and Practice, 298, published by Elsevier (1985).

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