Surfactant Extraction-spectrophotometric Determination of Nickel(II) in the Samples of a High Salinity.

概要

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Trace amount of nickel (II) was determined by a surfactant extraction-spectrophotometric method. A calibration curve was linear to the nickel concentration between 0 and 7.78×10-7mol dm-3. The molar absorption coefficient and detection limit were 5.01×105 dm3 moll cm-1 and 1.6 ppb, respectively. Nickel (II) was extracted as a dodecylxanthato complex into a surfactant phase of sodium dodecylsulfate (SDS) that was separated by addition of sodium chloride. After removal of aqueous phase, the complex in the surfactant phase was decomposed by an addition of hydrochloric acid. The concentration of nickel (II) was spectrophotometrically determined with 2- (2-benzothiazolylazo) -5-dimethylaminobenzoic acid (BTAMB) at 645nm. Coexisting iron interfered with the nickel measurement, however it was removed from SDS phase by the addition of triethanol amine. The masking with tiron eliminated the interference of Cu (II) and Mn (II) . This method was available for screening of the nickel concentrations in high salinity samples such as seawater.
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