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Paper Information

Journal:   NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN)   FALL 2007 , Volume 26 , Number 3; Page(s) 9 To 17.
 
Paper: 

DETERMINATION OF CATIONIC EXCHANGE CAPACITY OF EXTRACTAD HUMIC ACID FROM NAHARKHORAN FOREST GORGAN'S SOIL FOR THE PB+2, CD+2 AND NI+2 BY USING BATCH METHOD

 
 
Author(s):  SAR DASHTI A.R.*, MOHAMMADIAN MOGHADAM SAEID
 
* DEPARTMENT OF CHEMISTRY, FACULTY OF SCIENCES, SISTAN AND BALUCHISTAN UNIVERSITY, ZAHEDAN, I.R. IRAN
 
Abstract: 

Humic acid as a natural polymer with hydrogen sites of the carboxyl-benzioc and phenolic groups (cationic exchange location) was extracted from forest soil by IHSS (International Humic Substance Society) method by using 0.5 M NaOH and 6 M HCI and was then purified in the presence of 0.3 M HF and 0.1 M HCI. The total cationic exchange capacity and cationic exchange capacities of each functional were determined by the potentiometric titration method in the presence of 0.2 M NaOH in medium aqueous. Fixation of metal ions of lead, cadmium and nickel on humic acid was carried out by stablizing ionic strength in different pH by batch method. The amount of fixed metal ions was measured by atomic flame absorption technique. Regarding the low detection limit of method for the metal ions the obtained results are in the following order:
Ce (Pb+2)=1.2747 mol/kg MD> Ce(Cd+2) =1. 0989 mol/kg M . D> Ce(Ni+2)=0.967 mol/kg MD. In another study by potentiometery titration method of 0.2 M NaOH, the cationic exchange capcity of humic acid to metal ion of lead, cadmium and nickel was calculated. These results are in complete accordance with the ones obtained by batch method. From this project indicated that the cationic exchange capacity of humic acid depended on hydrate radius of cation concentration and strength ionic and pH of solution. Distribution coefficient shows this method could be a useful technique to remove metallic pollutants from the environment.

 
Keyword(s): FOREST SOIL, EXTRACTION OF HUMIC ACID, FIXATION OF IONS OF LEAD, CADMIUM AND NICKEL, CATIONIC EXCHANGE CAPACITY, POTENTIOMETERY TITRATION
 
References: 
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  Persian Abstract Yearly Visit 74
 
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