Abstract: Polysaccharides are a diverse class of polymeric materials of natural (animal, plant, algal) origin formed via glycosidic linkages of monosaccharides and are known for making composites when they are crosslinked with di or tri valent cations. Such materials are non-toxic, economically viable, easily available and environmentally benign. The applications are many like sensors, targeted drug delivery, tissue engineering, catalytic conversion of toxic metals and bound heeling. Worldwide, industrial development increases the toxic metals such as As, Hg, Cd and Cr in soil and ground water. Amongst these metals, Cr(VI) is emerged as the most hazardous metal to living things. The excess amount of Cr(VI) generated by electroplating, leather tanning, metal policing, pigment industry, cooling tower, steel manufacturing and photography causes severe problem in kidney, liver, vomiting, diarrhea and skin disorder. Several methods are available for the removal of Cr(VI) including adsorption, bio-sorption, electro coagulation, ion exchange, filtration and photo catalytic reduction. Herein, electrochemical method is used to determine Cr(VI) using Alginate(alg.) /Carboxymethylcellulose(CMC)/Dextran(Dex.)/MnO₂/g-C₃N₄/Ca with detection limit of 0.63 ng/mL which is the lowest limit reported so far. The UV-Vis. spectroscopy is used to reduce Cr(VI) to Cr(III) in presence of NaBH₄ just in 26.63 s without using H₂SO₄ which is toxic and the reaction kinetic become uncontrolled when H₂SO₄ is used.