A Simple Spectrophotometric Determination of Nickel(II) Using 1-Nitroso-2-naphthol in Anionic Micellar Solution
作者:Ghulam Abbas Shar、Gulafshan Soomro
DOI:10.14233/ajchem.2015.18779
日期:——
A simple rapid new spectrophotometric method has been developed for the determination of nickel at trace level using 1-nitroso-2-naphthol as complexing reagent in presence of anionic aqueous micellar solution surfactant 1 % sodium dodecyl sulphate. 1-Nitroso-2-naphthol reacts with nickel(II) to form bis(1-nitroso-2-naphtholato) nickel complex. The use of micellar system replaces the previous solvent extraction steps while enhancing the sensitivity, selectivity and the molar absorptivity which reduces the cost and toxicity. The average molar absorption coefficient and Sandells sensitivity was found to be 1.02 × 104 L mol-1 cm-1 and 5.7 ng cm-2 at lmax 471.6 nm. Linear calibration graph was obtained over the concentration range 0.25-4.0 μg mL-1, the stoichiometric composition of the chelate was 1:2 (Ni:[NNPh]2. The developed method was successfully applied for the determination of nickel from alloy and real samples.
本研究采用 1-亚硝基-2-萘酚作为络合试剂,在阴离子胶束水溶液表面活性剂 1 % 十二烷基硫酸钠的存在下,开发了一种简单快速的新分光光度法,用于测定痕量镍。1- 亚硝基-2-萘酚与镍(II)反应生成双(1-亚硝基-2-萘酚)镍络合物。胶束系统的使用取代了以往的溶剂萃取步骤,同时提高了灵敏度、选择性和摩尔吸收率,降低了成本和毒性。在最大波长为 471.6 纳米时,平均摩尔吸收系数和桑德尔灵敏度分别为 1.02 × 104 L mol-1 cm-1 和 5.7 ng cm-2。在 0.25-4.0 μg mL-1 的浓度范围内获得了线性校准图,螯合物的化学计量学组成为 1:2(Ni:[NNPh]2)。所建立的方法成功地应用于合金和实际样品中镍的测定。