Determination of Ni(II) with picolinaldehyde-4-phenyl-3-thiosemicarbazone used as a chromogenic reagent in a nonionic micellar system

摘要

Spectrophotometric determination of Ni(II) was carried outusing picolinaldehyde-4-phenyl-3-thiosemicarbazone (PAPT) as acomplexing/chromogenic reagent. The possibility of using a micellarsystem was explored to enhance the degree of detection and allow amore sensitive spectrophotometric method for the determination ofnickel ions. The anionic surfactant Triton X-100 greatly enhanced themolar absorptivity and limit of detection relative to that observedwith bulk water or an organic solvent. The linear calibration graphswere obtained for 0.5-2.0 mg L^{-1} and 0.001-1.0 mg L^{-1} of Ni(II)in aqueous and surfactant media, respectively. Using this approach,the limit of detection for the PAPT-Ni(II) complex (based on 3 sigmaof blank absorbance/slope) was found to be 0.0008 mg L^{-1} with amicellar enhancement reagent. The interference from over 50 cations,anions, and complexing agents was studied at 0.50 mg L^{-1} of Ni(II);most metal ions can be tolerated in considerable amounts in aqueousmicellar solutions.