Removal of Heavy Metals from Oryza Sativa Rice by Sour Lemon Peel as Bio-Sorbent
Aysooda Razafsha1 and Parisa Ziarati2*1Pharmaceutical Sciences Research Center, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran-Iran (IAUPS).
2Department of Medicinal Chemistry, Pharmacy Faculty, Pharmaceutical Sciences Branch, Islamic Azad University (IAUPS), Tehran –Iran.
Corresponding Author E-mail: ziarati.p@iaups.ac.ir
Abstract: Nowadays scientific approach has been diverted towards the biomaterials which are byproducts or the wastes from large scale industrial operations and agricultural waste materials or even vegetable and food processing wastes. The current study was designed for utilization of sour lemon peel as less expensive and much frequently available food waste materials due to prospective metal bio-sorption capacity to toxic heavy metal ions: Nickel, Cadmium and Lead from Oryza Sativa rice from Astaneh Ashrafieh, Gillan province in the north of Iran. The effect of soaking rinsed rice samples by NaCl and modified sour lemon peel adsorbent by different concentration, pH, contact time and percentage of adsorbent and association of cooking methods on Nickel, Cadmium and Lead contents were studied. Heavy metal contents in raw, rinsed, soaked by adsorbent and cooked and drained rice samples were determined by Atomic Absorption spectrophotometer. It was found that cooking rice by soaking rinsed rice samples by NaCl 2% and sour lemon peel modified by phosphoric acid 1% at least for 1 hours had the greatest effect (significantly affect p<0.001) with regards to lowering Pb and Cd levels in cooked rice. Specifically, it preferentially reduced the Cadmium content by 96.4 %, Nickel content by 67.9% and Lead content by 90.11% from the raw rice, when combined with rinse washing and being soaked by salt for one hour contact time. The results of current study reveal that sour lemon peel as citrus by-products represent a great potential for use as substrates in biotechnological processes.
Keywords: Removal Heavy Metal; Sour Lemon peel; Oryza Sativa rice; Adsorbent Back to TOC