- All Journals
- Al-Qadisiyah University
- Basrah University
- Kirkuk University
- Mosul University
- The Iraqi Borad for Medical Specialization
- University of Anbar
- University of Technology
- Al Mustafa University
- Al-Zahraa University for Women
- Alnoor University
- Kunooz University
- Misan University
- Ninevah University
- Tikrit University
- University of Al-Hamdaniya
- University of Kerbala
DESORPTION OF LEAD, COPPER AND ZINC FROM IRAQI SILTY CONTAMINATED SOIL | ||
| Al-Qadisiyah Journal for Engineering Sciences | ||
| Article 1, Volume 8, Issue 4, 2015, Pages 540-557 PDF (0 K) | ||
| Authors | ||
| Hatem Asal Gzar; Zahraa Hassan Mottar | ||
| Abstract | ||
| This study presents an experimental investigations undertaken to evaluate the effect of two extractant solutions (EDTA- Na2 and/or citric acid) and different conditions (pH, extractant concentration, and contact time) on the removal efficiency. Iraqi silty soil are studied, the soil was artificially contaminated with lead (Pb), copper (Cu) and zinc (Zn) to achieve higher levels of contamination. A series of batch experiments were conducted to determine the removal efficiency of lead, copper, and zinc using EDTA- Na2 and/or citric acid. The influence of solution pH, extraction time, and extractant concentration were studied in order to evaluate the optimum condition for soil washing process. The feasibility of soil washing method for decontamination of soil was evaluated in laboratoryscale batch experiments. Soil samples containing 500 mg/kg of Pb, Cu, or Zn were subjected to ethelenediaminetetraacitic acid disodium salt (EDTA- Na2) and/or citric acid (CA) treatment. Soil washing experiments performed on 2.0 g portions of the spiked soil using (0.001, 0.005, 0.01, 0.05, and 0.1M) chelating agents at a solid:liquid ratio of 1:10 showed that extraction efficiency of EDTA-Na2 was much higher than that of citric acid, and higher concentrations of complexing agent lead to better extraction. Results show that EDTA-Na2 was better in releasing soil-bound metals from the soil compared to citric acid where 67.13% of lead was extracted using 0.1M of EDTA-Na2 while only 36.5% was extracted using the same concentration of CA. Up to 51.48% of copper was extracted using EDTA-Na2 while only 24.86% was extracted using CA. similar results appear for zinc, where 44.2% was extracted using EDTA-Na2 and 16.73% was extracted using CA. The highest extraction values of lead can be observed at pH values from 4 to 5 , copper at pH= 8 and zinc at pH = 9. | ||
| Keywords | ||
| Contaminated Soil; Heavy metals; soil washing; extraction | ||
|
Statistics Article View: 443 PDF Download: 253 |
||