ساخت الکترودهای اصلاح‌شده صفحه چاپی حالت جامد و میله کربنی برای تعیین پتانسیومتری تالیم (III)

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسنده

استادیار، گروه شیمی، دانشگاه فنی و حرفه‌ای، تهران، ایران.

چکیده

این مطالعه تحقیقاتی بر توسعه حسگر پتانسیومتری جدید برای تعیین یون‌های تالیم (III) در محلول‌های آبی متمرکز است. الکترودهای انتخابی یونی[1] مبتنی بر الکترود صفحه چاپی کربنی[2] و الکترود میله کربنی می‌باشد و سطح الکترودها با پلیمر قالب یونی[3] تالیم (III) به‌عنوان یون‌دوست اصلاح شده است. الکترود انتخابی یونی با پراکندگی ذرات پلیمر قالب- تالیم (III) در 2-نیتروفنیل اکتیل اتر[4] به‌عنوان یک نرم‌کننده و سپس قرار دادن آنها در بافت پلیمری پلی وینیل کلراید[5] تهیه می‌شود. الکترود انتخاب یونی تالیم ( (IIIپاسخ نرنست را برای یون تالیم (III) در محدوده غلظت دینامیکی µM  5/20- 49/0 با شیب 6/19 میلی‌ولت نشان می‌دهد. از نکات قابل‌توجه، ضریب انتخاب‌پذیری الکترود تهیه‌شده می‌باشد. ضریب انتخاب‌پذیری این الکترود برای یون‌های دیگر از3-10×1/1 کمتر می‌باشد و این نشان‌دهنده گزینش‌پذیری الکترود به یون تالیم (III) می‌باشد و یون‌های دیگر مزاحمت کمتری دارد.
 
[1] Ion-selective electrode (ISE)
[2] Screen-printed electrode (SPE)
[3] Ion-imprinted polymer (IIP)
[4] 2-nitrophenyloctylether (NPOE)
[5] Polyvinylchloride (PVC)
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Construction of Modified Solid-State Screen-Printed and Carbon Rod Electrodes for Determination of Thallium (III) Ions by Potentiometric Sensor

نویسنده [English]

  • َAbolfazl Darroudi
Assistant Professor, Department of Chemistry, Technical and Vocational University, Tehran, Iran.
چکیده [English]

This research study was focused on development of novel potentiometric sensor for the determination of thallium (III) ions in water solutions. Ion-selective electrodes based on screen-printed graphite electrode and carbon rod electrode described and modified solid-state screen-printed and carbon rod electrodes with thallium (III)-imprinted polymer as ionopher. The ion-selective electrode was prepared by dispersing the thallium (III)-imprinted polymer particles in 2-nitrophenyloctylether as a plasticizer and then embedding them in a polyvinylchloride polymeric matrix. The Tl (III)-ion selective electrode showed a Nernstian response for thallium (III) ions over the dynamic concentration range of 0.49 to 20.5 µM, with a slope of 19.6 mV per decade. One of the significant points was the selectivity coefficient of the prepared ion-selective electrode. The selectivity of this electrode for other ions was less than 1.1× 10-3 and this indicates the selectivity of the electrode to thallium (III) ions and other ions was less disturbing.

کلیدواژه‌ها [English]

  • Thallium Potentiometric Sensor Ion
  • imprinted polymer Screen
  • printed electrode
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