Single-channel flow injection spectrophotometric determination of nickel using furildioxime in micellar solution

Abstract

A very simple, selective, and fast flow injection spectrophotometeric method is developed for determination of nickel using furildioxime as complexing agent. Micellar solution of brij-35 is employed to solubilize the sparingly soluble complex of Ni-furildioxime in buffered aqueous system (pH-9.00). Under optimized conditions, absorbance is linear from 0.02 to 10g mL - 1 using 500L sample volume and from 10 to 30g mL - 1 using 50L sample volume of nickel at 480nm, with R 2 = 0.9971 and 0.9916, respectively. The molar absorption coefficient and Sandell's sensitivity were 6.0 × 10 3 L mol - 1 cm - 1 and 0.01ng cm - 2, respectively. The sample throughput of the method is 120 samples per hour with RSD of 0.01-0.2 for 0.02 to 10g mL - 1 nickel (n = 5), indicating that the method is highly precise and reproducible. Interference from cobalt is removed by Nitroso R-salt-modified XAD-16. The developed method is validated by analysing certified reference materials and is applied to assess nickel content of commercially available cigarettes. Copyright © 2012 Najma Memon et al.