Application of Metal-Organic Framework and Sulfur Functionalized Graphene Oxide Composite as the Sorbent for Solid-Phase Extraction of Lead before its Determination by Flame Atomic Absorption Spectrometry

  • سال انتشار: 1400
  • محل انتشار: دهمین سمینارملی شیمی و محیط زیست ایران
  • کد COI اختصاصی: NSCEI10_112
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 155
دانلود فایل این مقاله

نویسندگان

M.H Sodeghi Moghaddam

Faculty of Sciences Department of Chemistry, Yazd University, ۸۹۱۵۸۱۳۱۴۹ , Yazd, Iran

A.M Haji Shabani

Faculty of Sciences Department of Chemistry, Yazd University, ۸۹۱۵۸۱۳۱۴۹ , Yazd, Iran

S Dadfarnia

Faculty of Sciences Department of Chemistry, Yazd University, ۸۹۱۵۸۱۳۱۴۹ , Yazd, Iran

M Nozohour

Faculty of Sciences Department of Chemistry, Yazd University, ۸۹۱۵۸۱۳۱۴۹ , Yazd, Iran

چکیده

Lead is a highly toxic element for humans and other living organisms. Lead can cause great damage to the kidneys and brain and can interfere with the production of red blood cells [۱,۲]. Therefore, the determination of small amounts of lead in different samples is very important.۲The most common technique for measuring lead is flame atomic absorption spectroscopy. However, direct determination of the low concentration of this element in real samples is often not possible due to the low sensitivity and disturbance of the sample tissue with this technique and requires a separation and pre-concentration step [۳].This study describes the synthesis, identification, and application of a new composite including a metal-organic framework and sulfur functionalized graphene oxide as the sorbent for solid-phase extraction and preconcentration of Pb۲+ ions from aqueous samples. The preconcentrated analyte was determined by flame atomic absorption spectrometry. The prepared sorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), field emission scanning microscopy (FESEM), X-ray diffraction (XRD), and nitrogen adsorption and desorption isotherm (BET analysis). The effect of important parameters such as the sample pH, amount of sorbent, extraction time, sample volume, and type, concentration, and volume of the eluent on the extraction of the analyte was investigated and optimized. At the optimal conditions, the calibration graph was linear in the concentration range of ۵.۰-۱۴۰.۰ μg L-۱ lead ions with a determination coefficient (R۲) of ۰.۹۹۹۸. The limit of detection (LOD) and the limit of quantification (LOQ) of the method were ۱.۱ and ۳.۵ μg L-۱, respectively. The relative standard deviations (RSDs) of ۱.۵ and ۲.۱% were obtained at ۱۲ μg L-۱ concentration level of Pb۲+ (n = ۶) for intra- and inter-day analysis, respectively. The developed method was successfully employed for the determination of lead in different water and food samples.

کلیدواژه ها

مقالات مرتبط جدید

اطلاعات بیشتر در مورد COI

COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.

کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.