<![CDATA[Rice is one of the most consumed grains not only in Iran but also in many other countries and it is vital to decrease the amount of heavy metals in rice. The aim of current study was to investigate the impact of coffee bean waste (CBW) and Rice Husk ( RH) as bio-adsorbent on reducing Lead, Arsenic, Cadmium and Nickel in rice (Oryza sativa). 950 rice samples were collected from different Tehran markets. Samples were prepared to extract heavy metals contents in raw, rinsed, soaked by adsorbent and cooked and drained rice states, were determined and measured using wet digestion method . Final concentration of heavy metals in rice samples were analyzed using Inductively Coupled Plasma Optical Emission Spectroscopy according to AOAC International Standard. Batch adsorption experiments were carried out to evaluate the effects of adsorbent-dosage, state of samples and ionic strength of solution on the adsorption of heavy metals onto bio-adsorbent that was simply gathered from nut and homemade wastes .Cadmium contents of samples were completely removed in cooking method, treated by the mixture of specified percentages of CBW and RH. Lead and Nickel contents decreased significantly (p<0.05) in all cooking methods. The findings of current study indicate that Food /Agro waste can be utilized beneficially in treating rice containing heavy metal ions.]]>
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