Payame Noor University, Iran Iranian Journal of Analytical Chemistry 2383-2207 1 1 2014 03 01 Separation and Preconcentration Trace Amounts of Nickel Ion Us-ing Modified Multiwalled Carbon Nanotubes Sorbent Prior to Flame Atomic Absorption Spectrometry Determination جداسازی و پیش تغلیظ مقادیر کم یون نیکل با استفاده از جاذب نانو لوله های کربنی اصلاح شده قبل از اندازه گیری جذب اتمی شعله 53 57 939 EN Maryam Ghanbarian Chemistry Department, Shahid Bahonar University of Kerman, Kerman, Iran Shahid Bahonar University of Kerman, Young Researcher Society, Kerman, Iran Farzad Etemadi Chemistry Department, Shahid Bahonar University of Kerman, Kerman, Iran Ali Mostafavi Chemistry Department, Shahid Bahonar University of Kerman, Kerman, Iran Moslem Afzali Chemistry Department, Shahid Bahonar University of Kerman, Kerman, Iran Journal Article 2014 01 17 <span style="font-family: Times New Roman;"><span style="font-size: small;">In this work, a selective method for separation and preconcentration of nickel ions at trace level on modified multiwalled carbon nanotubes columns and determination by flame atomic absorption spectrometry (FAAS) has been developed. Multiwalled carbon nanotubes were oxidized with concentrated HNO</span>_{<span style="font-size: x-small;">3</span>}<span style="font-size: small;"> and then modified </span></span><span style="font-family: Times New Roman; font-size: small;">with loading 1-(2-pyridylazo)-2-naphtol</span><span style="font-family: Times New Roman;"><span style="font-size: small;">. 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</span>^{<span style="font-size: x-small;">−1</span>}<span style="font-size: small;"> HNO</span>_{<span style="font-size: x-small;">3</span>}<span style="font-size: small;">. The amount of eluted nickel was measured using flame atomic absorption spectrometry. Factors influencing sorption and desorption of Ni(II) ions were investigated, including the sample pH, flow rates of sample and eluent solution, eluent type, breakthrough volume and interference ions. The relative standard deviation of the method was ±0.57% (n=8) and the limit of detection was 2.04</span></span> <span style="font-family: Times New Roman; font-size: small;"> </span> <span style="font-family: Times New Roman;"><span style="font-size: small;">g mL</span>^{<span style="font-size: x-small;">−1 </span>}<span style="font-size: small;">(3σ</span>_{<span style="font-size: x-small;">b</span>}<span style="font-size: small;">/m, n=8). The method was applied to the determination of Ni(II) in water samples and standard alloy (NKK. NO. 920, Aluminum Alloy). </span></span> در کار حاضر از نانولوله های کربنی چند لایه به عنوان فاز جامد جهت استخراج یون های فلزی نیکل مورد استفاده قرار گرفت. قبل از استفاده، این جاذب توسط معرف 1- (2- پیرپدپل آزو)- 2-نفتول به عنوان یک معرف کی لیت دهنده اصلاح گردید. جاذب اصلاح شده قادر به تغلیظ مقادیر فلزی یون نیکل در محدوده  01/0تا10 میکروگرم بر میلی لیتر می باشد که پس از تغلیظ واجذب توسط0/5 میلی لیتر اسید نیتریک 1/0 مولار صورت گرفت. <span style="font-family: Times New Roman;">pH</span> بهینه بدست آمده 9 می باشد و اندازه گیری ها توسط دستگاه طیف بینی جذب اتمی شعله انجام گردید. https://ijac.journals.pnu.ac.ir/article_939_900be47416e5413bfb0609508452e79d.pdf