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. International Journal of Pharma and Bio Sciences, [S. l.], v. 6, n. 3, p. 101–111, 2015. Disponível em: https://ijpbs.net/index.php/journal/article/view/4384. Acesso em: 24 jul. 2026.