مقاله Ultraدرtrace determination of total Thallium using ion pair based dispersive liquid liquid microextraction followed by electrothermal atomic absorption spectrometry در word دارای 17 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است
فایل ورد مقاله Ultraدرtrace determination of total Thallium using ion pair based dispersive liquid liquid microextraction followed by electrothermal atomic absorption spectrometry در word کاملا فرمت بندی و تنظیم شده در استاندارد دانشگاه و مراکز دولتی می باشد.
این پروژه توسط مرکز مرکز پروژه های دانشجویی آماده و تنظیم شده است
توجه : در صورت مشاهده بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی مقاله Ultraدرtrace determination of total Thallium using ion pair based dispersive liquid liquid microextraction followed by electrothermal atomic absorption spectrometry در word،به هیچ وجه بهم ریختگی وجود ندارد
بخشی از متن مقاله Ultraدرtrace determination of total Thallium using ion pair based dispersive liquid liquid microextraction followed by electrothermal atomic absorption spectrometry در word :
سال انتشار: 1394
محل انتشار: سومین همایش سراسری محیط زیست، انرژی و پدافند زیستی
تعداد صفحات: 17
نویسنده(ها):
Farzaneh Javedani-Asleh – Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
Mohammad Eftekhari – Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
Mahmoud Chamsaz – Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
Samira Vakilzadeh – Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده:
An efficient, simple and sensitive ion pair based dispersive liquid liquid microextraction technique was used for preconcentration and determination of ultra-trace levels of total thallium followed by electrothermal atomic absorption spectrometry (ETAAS). In this method, Tl () was complexed by bromide ion (Br-) to produce TlBr4- followed by addition of cetylpyridinium chloride (CPC) as a counter ion to form hydrophobic complex of TlBr4-CPC. The resulting complex was extracted into the extraction solvent by dispersive liquid liquid microextraction (DLLME). In DLLME, a mixture of 1.5 mL of methanol (as disperser solvent) containing 150 L of chloroform (as extraction solvent) was rapidly injected into the sample solution to extract the hydrophobic TlBr4-CPC complex. The important parameters affecting the extraction efficiency such as HBr concentration (as a source of bromide anion), CPC concentration and type and volume of the extraction and disperser solvent were investigated and optimized in details. Under the optimum conditions, the calibration curve was linear in the range of 0.1 – 2 g L-1 of Tl () with a correlation coefficient of 0.9992. The limit of detection (LOD) was 0.03 g L-1 and the relative standard deviation (RSD, %) based on six replicate analysis of 1 g L-1 Tl () was 4.1 %. The accuracy of the method was checked by the analysis of certified reference material (CRM) and spike methods. The proposed method was successfully applied for determination of ultra-trace levels of Tl in different water samples
- ۹۵/۰۷/۲۶