Paper Information

Title: 

SPECIATION OF NICKEL AND CADMIUM DURING THE INCUBATION TIME BY MINTEQA2 MODEL

Type: PAPER
Author(s): RAVANBAKHSH MOHAMMAD HOSSEIN,FOTOVAT AMIR,HAGHNIA GHOLAM HOSSEIN
 
 
 
Name of Seminar: HAMAYESHE MANTAGHEI KARBORD FANAVARIHAYE NOVIN DAR KESHAVARZI
Type of Seminar:  CONGRESS
Sponsor:  Islamic Azad University, Shiraz
Date:  2008Volume 1
 
 
Abstract: 

IN ORDER TO STUDY THE CHEMICAL BEHAVIOR OF NICKEL AND CADMIUM DURING THE INCUBATION TIME, A FACTORIAL EXPERIMENT AS A COMPLETELY RANDOMIZED DESIGN WITH THREE REPLICATIONS WAS CARRIED OUT. FACTORS INCLUDED TWO DIFFERENT SOILS (4 AND 30 PERCENT CACO3), TWO LEVELS OF NICKEL (0 AND 100 MG.KG-1), TWO LEVELS OF CADMIUM (0 AND 25 MG.KG-1) AND ORGANIC MATTER IN THE FORM OF SEWAGE SLUDGE IN TWO LEVELS (0 AND 100 TONE.HA-1), AND THREE INCUBATION TIMES (0, 30, 60 DAYS). CONCENTRATION OF CATIONS, ANIONS, DISSOLVED ORGANIC CARBON AND PH WERE MEASURED IN SOIL EXTRACTS. SOIL SOLUTIONS WERE SPECIATED FOR CHEMICAL FORMS OF NICKEL AND CADMIUM BY MINTEQA2 MODEL. THE RESULTS OF THIS STUDY SHOWED THAT, AVAILABLE NICKEL AND CADMIUM DECREASED SIGNIFICANTLY WITH TIME. IN BEGGING OF THE EXPERIMENT A MAJOR PORTION OF THE APPLIED CADMIUM TO BE PRESENT IN THE FREE DIVALENT FORMS (37% OF DISSOLVED CADMIUM) AND GRADUALLY BE CONVERTED TO OTHER FORMS SUCH AS CARBONATE, BICARBONATE, SULFATE AND CHLORATE FORMS. NICKEL WAS PRESENT MAINLY IN THE CARBONATED FORMS WITH AN AVERAGE OF 90.6%. ORGANO-METAL COMPLEXES ACCOUNTED FOR ONLY A MINOR PROPORTION OF COMPLEXED METALS; HOWEVER SIMILAR TRENDS SHOWED BETWEEN DOM AND M-DOM. IT SEEMS THAT IN THE STUDY SOILS CALCIUM CARBONATE PLAYS A KEY ROLE IN CHEMICAL BEHAVIOR OF NICKEL AND CADMIUM IN SOLUTION PHASE.

 
Keyword(s): HEAVY METALS, SPECIATION, CALCAREOUS SOILS, MINTEQA2 MODEL, SOIL SOLUTION
 
Yearly Visit 11   tarjomyar
 
Latest on Blog
Enter SID Blog