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  • Title: Cloud point extraction, preconcentration and simultaneous spectrophotometric determination of nickel and cobalt in water samples.
    Author: Safavi A, Abdollahi H, Hormozi Nezhad MR, Kamali R.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2004 Oct; 60(12):2897-901. PubMed ID: 15350927.
    Abstract:
    Cloud point extraction has been used for the preconcentration and simultaneous spectrophotometric determination of nickel and cobalt after the formation of a complex with 2-amino-cyclopentene-1-dithiocarboxylic acid (ACDA), and latter analysis by spectrophotometer using Triton X-114 as surfactant. The parameters affecting the separation phase and detection process were optimized. Under the optimum experimental conditions (i.e. pH=5, 0.07 mM ACDA, Triton X-114=0.25% (w/v)), calibration graphs were linear in the range of 20-500 and 20-200 microg l(-1) with detection limits of 10 and 7.5 microg l(-1) for Ni and Co, respectively. The method was applied to the determination of Ni and Co in natural and waste water samples with satisfactory results.
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