10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 3 2015 (July - September) A chelating resin of chitosan-1,5-diphenylcarbazide modified with the alginate salts and utilization as a filler material column has been synthesized and the sorption properties have been investigated for preconcentration and determination of Cr(VI) at trace levels The optimal composition of the formation of Ca-alginate-chitosan-1,5-diphenylcarbazide microcapsules were 1% Na-alginate, 0.1M CaCl lessThan sub greaterThan 2 lessThan /sub greaterThan and 0.6 g resin. The retention capacity of resin modified was 2.2124 mg Cr (VI) /g resin at optimum pH 4-6. The analytical performance this method is good which are shown by the limit of detection was 1.14 µg/L and the reproducibility level shown by the percentage of the coefficient variance was 1.9563 %. This method was applied for Cr(VI) determination in river water samples collected from Karang Mumus and Mahakam Rivers, East Kalimantan, Indonesia. AMAN SENTOSA PANGGABEAN AND BOHARI YUSUF Chelating resin, Chitosan, Diphenylcarbazide, Cr(VI), Preconcentration 101-111