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The present article investigates a hydrogel Coated Fiber Bragg grating (FBG) based sensor capable of detecting trace amounts of carcinogenic chromium(VI) metal ion. A stimulus responsive hydrogel encompassed with tetraalkylammonium salts which is specifically sensitive to Cr(VI) ion, is synthesized and coated on FBG. When the proposed sensor system is exposed to various concentrations of Cr(VI) ion...