Arsenic (Asl and Antimony (Sbl are toxic heavy metals that often associated in ‎contaminated environment. High As concentration is reported in Chelpo. Khorasan ‎province, northeast Iran. Tins study examined the possibility of As and Sb in ‎rhizofillration by common reed. Phrugmites utistrulis. Plants collected from five ‎sampling sites of Chelpo. As and Sb concentrations in roots and shoots were ‎determined by Atomic absoiption spectrometry. About 80@ o of total As accumulated ‎in roots than shoot system. Maximum As and Sb accumulation in root and rluzomes ‎were 8-4.5-16.20 and \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"3-10.20 ppb. respectively. As\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'Sb ratio of root and rliizome ‎ranged from 35 to 19-4 and 10.-42 to 99.9. respectively. Arsenic contents in roots of ‎contaminated plants were significantly higher than antimony accumulation (p i.i.i.il I. ‎There was antagonistic interaction between As. Sb with P contents in the roots of ‎contaminated plants. Common reed establislunent may be locally enhanced by ‎significantly decreased phosphorous (l.~9 and 1.18 tunes less than control plant root ‎and rliizome I. increased Iron (1.-42 and 5.83 times more than control plant root and ‎rliizome I Enzymatic antioxidants (Catalase. Ascorbate peroxidase and Guaicol ‎peroxidasel increased significantly with increment of As uptake in root system. Root ‎As and Sb accumulation with enhanced changes in metabolic changes indicates that ‎ P. uustrulis could be used as As. Sb rhizofiltration agent in tins region and ‎similar contaminated area.‎

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