Paper Information

Title: 

THE DETERMINATION OF CHEMICAL OXYGEN DEMAND IN SPENT CAUSTIC WASTE BY CLOSED-TUBE DIGESTION PROCEDURE USING POTENTIOMETRIC DETERMINATION

Type: PAPER
Author(s): HARRAFI HAMED*,KHEDRI MASOUMEH,KARAMINEJAD KARIM
 
 *LABORATORY DEPARTMENT, PHASES 9 AND 10, SOUTH PARS GAS COMPLEX, ASSALUYEH, IRAN
 
Name of Seminar: INTERNATIONAL CONFERENCE OIL, GAS, PETROCHEMICAL AND POWER PLANT
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVONI AMOZESHI PAZHOHESHI VESTA
Date:  2012Volume 1
 
 
Abstract: 

MEASUREMENT OF THE COD OF A SPENT CAUSTIC SOLUTION INVOLVES FIRSTLY DIGESTION OF A TEST SAMPLE WITH DICHROMATE SOLUTION AND SECONDLY MEASUREMENT OF DICHROMATE REMAINED BY TITRATION BY FERROUS AMMONIUM SULFATE (FAS) TO AN END POINT. IN THIS PAPER WE STUDY BY A POTENTIOMETRIC END POINT WITH AG/AGCL REFERENCE ELECTRODE AND GOLD RODE ELECTRODE. THE POTENTIOMETRIC END POINT IS SHARP AND EASILY IDENTIFIED ESPECIALLY FOR THE SAMPLES WITH HIGH TURBIDITY AND COLOR THAT OTHER METHODS SUCH AS COLORIMETRIC IN THIS TYPE OF SAMPLE DO NOT RESULT IN HIGH PRECISION. BECAUSE INTERIM OF TITRATION RESPONDS QUICKLY TO POTENTIAL CHANGES WITHIN THE (CR+6/CR+3 & FE+2/FE+3) SOLUTION PRODUCING STABLE READINGS THAT IS LEAD TO ACCURATE COD MEASUREMENT. FINALLY RESULTS ARE COMPARED WITH DATA DETERMINED USING COLORIMETRIC METHOD FOR STANDARD SAMPLES. IT IS SHOWN THAT THE POTENTIOMETRIC END POINT TITRATION WITH GOLD RODE ELECTRODE CAN BE USED WITH EQUAL OR BETTER FACILITY.

 
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