Single-Channel Flow Injection Spectrophotometric Determination of Nickel Using Furildioxime in Micellar Solution
2012
Najma Memon | Saima Memon | Amber R. Solangi | Rubina Soomro | Rabel Soomro
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 10 μg m L − 1 using 500 μL sample volume and from 10 to 30 μg m L − 1 using 50 μL sample volume of nickel at 480 nm, with 𝑅 2 = 0 . 9 9 7 1 and 0.9916, respectively. The molar absorption coefficient and Sandell's sensitivity were 6 . 0 × 1 0 3 L m o l − 1 c m − 1 and 0.01 ng c m − 2 , respectively. The sample throughput of the method is 120 samples per hour with RSD of 0.01–0.2% for 0.02 to 10 μg m L − 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.
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