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Background and purpose: Pphenol is one of major available compound in industrial wastewater. Phenol is classified as priority and dangerous pollutant in International Agency for Research on Cancer (IARC) and in list of EPA. Thus, the purpose of this study is survey on effect of sorbitol on phenol removal rate by lemna minor. Materials and methods: Tthis is an empirical- lab study. In this study, lemna minor in various amounts (0.3, 0.4, 0.6gr) was contacted with phenol concentration of 5, 10, 25, 50 ppm and sorbitol was added in known amounts into containers (0.2 and 1gr). In order to prevent of probable error, all experiments were done 2 times. Every 4 days, samples were provided from containers and the phenol concentration was determined by colorimetery in wavelength of 510nm.. Results: Tthe findings of this study showed that the increasing of initial concentration of phenol can decrease the removal rate and in concentration of less than 10 mg/l, the removal rate can be up to 95-99%. The removal rate of phenol increase by increasing of contact time and amount of lemna. Presence of sorbitol in culture medium can lead to increase of growth and reproduction and increasing of removal rate of phenol by lemna. Conclusion: Llemna minor is able to remove of phenol from aqueous. The addition of sorbitol carbohydrate can lead to increase of growth and reproduction and the efficiency of phenol removal by leman minor.

Keywords: Phenol, Lemna minor, Sorbitol

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