Separation and Preconcentration Trace Amounts of Nickel Ion UsingModified Multiwalled Carbon Nanotubes Sorbent Prior to FlameAtomic Absorption Spectrometry Determination

In this work, a selective method for separation and preconcentration of nickel ions at trace level on modified multiwalled carbonnanotubes columns and determination by flame atomic absorption spectrometry (FAAS) has been developed. Multiwalled carbonnanotubes were oxidized with concentrated HNO3 and then modified with loading 1-(2-pyridylazo)-2-naphtol. The sorption of Ni(II)ions was quantitative in the pH =9. Elution of the adsorbed nickel was carried out with 5.0 mL of 0.1 mol L−1 HNO3. The amount ofeluted nickel was measured using flame atomic absorption spectrometry. Factors influencing sorption and desorption of Ni(II) ionswere investigated, including the sample pH, flow rates of sample and eluent solution, eluent type, breakthrough volume and interferenceions. The relative standard deviation of the method was ±0.57% (n=8) and the limit of detection was 2.04× 10−2

کلیدواژه ها:

Modified multiwalled carbon nanotubes ، Preconcentration ، Nickel determination ، Water sample ، NKK. NO. 920 ، Aluminum Alloy