Determination of iron (III) in food, biological and environmental samples

The nanodrop spectrophotometric (NDS) determination of iron (III) in water samples has been established. The proposed method is simple, selective and highly sensitive. The extraction of Fe (III)thiocyanate complex was done by novel organic reagents such as N-phenylacetamide, N-alkylacetamide, (alkyl = butyl, hexyl and octyl group) in chloroform. The Fe (III) extract was examined in the strong acidic (HCl + H2SO4) solution. The maximum value of molar absorptivity was found to be 1.8 x 10(5) L mol (1) cm (1) at lambda(max), 477 nm (>= 9 fold enrichments) for N-octylacetamide (N-OAA). The method obeys the Beers Law within the range of 0.05 mu g mL (1)-6.0 mu g mL (1). The detection limit and RSD value of the method were found to be 5 ppb and 0.5906% respectively. The correlation coefficient, slope and intercept were calculated and found to be 0.9989, 0.1112, and 0.0048, respectively. The proposed method was successfully applied to the determination of trace amount of iron (III) in food, biological and environmental samples. (C) 2016 Elsevier Ltd. All rights reserved.