AMAN SENTOSA PANGGABEAN, and BOHARI YUSUF. “DETERMINATION OF Cr(VI) BY USING CHITOSAN-1,5- DIPHENYL CARBAZIDE RESIN MODIFIED AT THE PRECONCENTRATION SYSTEM WITH COLUMN METHOD”. International Journal of Pharma and Bio Sciences 6, no. 3 (September 30, 2015): 101–111. Accessed July 24, 2026. https://ijpbs.net/index.php/journal/article/view/4384.