Spectrophotometric Determination of Hexavalent Chromium Content in Commercial Cement Samples by a Simple and Rapid Procedure for the Extraction and Analysis of Chromium (Vi)

Promoted adsorptive removal of chromium(vi) ions from water by a green-synthesized hybrid magnetic nanocomposite (NFe3O4Starch-Glu-NFe3O4ED)

“…The complexing agent 1,5-diphenylcarbazide and a UV-Vis spectrophotometer (in the visible region at wavelength of λ max = 540 cm −1 ) were used to determine the residual concentration of Cr( vi ). 40 The adsorptive removal percentage (% R ) and the adsorption capacity ( q e ; mg g −1 ) of Cr( vi ) ions on the NFe 3 O 4 Starch-Glu-NFe 3 O 4 ED nanocomposite were calculated using eqn (1) and (2) , respectively. where C t is the concentration of Cr( vi ) ions at equilibrium (mg L −1 ), C 0 is the initial concentration of Cr( vi ) ions before the adsorption process (mg L −1 ), W is the weight of the nanocomposite (mg) and V is the volume of solution in Liter.…”