AMAN SENTOSA PANGGABEAN, BOHARI YUSUF. DETERMINATION OF Cr(VI) BY USING CHITOSAN-1,5- DIPHENYL CARBAZIDE RESIN MODIFIED AT THE PRECONCENTRATION SYSTEM WITH COLUMN METHOD. ijpbs [Internet]. 2015 Sep. 30 [cited 2026 Jul. 24];6(3):101-1. Available from: https://ijpbs.net/index.php/journal/article/view/4384