Add time:09/06/2019         Source:sciencedirect.com

The reagent diethyldithiocarbamic acid has been examined for the high-performance liquid chromatographic separation of cobalt(II) and nickel(II) chelates on reversed-phase HPLC columns (150 × 3.9 mm) packed with Nova-Pak C18, 4 μm. The metal-diethyldithiocarbamic chelates were preconcentrated by solvent extraction. An aliquot of sample containing copper, cobalt and nickel in a mixture was transferred to a well-stoppered test tube to which was added reagent [diethyldithiocarbamic acid 0.5% in ethanol—water (1:1), pH 10] and 10 ml organic solvent (diethyl ether). After shaking with mechanical shaker for 5 min, the organic layer was separated and 0.1 ml transferred to another tube containing methanol (1 ml). The methanolic solution (15 μl) was injected, on the reversed-phase HPLC column. The complexes are eluted with methanol—water (75:25) at a flow-rate of 0.5 ml min−1. The detection is carried out with a UV detector at 260 nm. The method shows several advantages: short analysis time, minimized sample preparation, minimized effect of interfering ions, a low detection limit (50 ppb for nickel and 5 ppb for cobalt) and good reproducibility, making it suitable for many types of samples, including alloys.

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