synthesize chitosan nanoparticles by ionic gelation of chitosan and tripolyphosphate and evaluates its sorption capacity for Cr (VI) by varying the operational factors (pH of solution, agitation time, ion concentration and adsorbent concentration) that are responsible for adsorption. This is the first report on sorption property of chitosan nanorod in the conversion of Cr (IV) to Cr (III). Fro this, the equilibrium data were fit to the Langmuir, the Freundlich and the Temkin sorption isotherms.