اندازه‌گیری آفت‌کش دیازینون در نمونه‌های سیب و آب زیرزمینی به روش ریز‌استخراج مایع ـ مایع پخشی جفت‌شده با طیف‌سنج تحرک یونی با منبع یونیزاسیون تخلیه کرونا

نوع مقاله : علمی-پژوهشی

نویسندگان

گروه شیمی تجزیه، دانشکده شیمی، دانشگاه صنعتی اصفهان، اصفهان

چکیده

در این کار پژوهشی، از روش جفت شده ریزاستخراج مایع- مایع پخشی- طیف سنجی تحرک یونی با منبع یونیزاسیون تخلیه کرونا (DLLME-CD-IMS) برای آنالیز آفت­کش دیازینون در نمونه­های حقیقی سیب و آب زیرزمینی استفاده شد. ریز استخراج مایع ـ مایع پخشی، روشی ارزان ، سریع با کارکرد آسان،حدتشخیص پایین و عامل تغلیظ بالا می‌باشد. در این فناوری، مخلوطی از 60  میکرولیتر کربن‌تتراکلرید (حلال استخراج‌کننده) و 0/1 میلی‌لیتر متانول (حلال پاشنده) به سرعت به 5 میلی‌لیتر محلول آبی دارای آنالیت تزریق شد. پس از سانتریفوژ محلول ( 3000 دور بر دقیقه به مدت 5 دقیقه) قطره­ های ریز کربن‌تتراکلرید در انتهای لوله آزمایش با انتهای مخروطی شکل ته‌نشین شدند. فاز ته‌نشین شده (5 میکرولیتر) به صورت مستقیم و بدون تبخیر حلال به‌وسیله محفظه تزریق طراحی شده، به دستگاه تزریق شد. پارامتر‌های مؤثّر بر بازده استخراج مانند نوع و حجم حلال استخراج‌کننده، امکان‌سنجی تزریق مستقیم فاز ته‌نشین شده به دستگاه CD-IMS، نوع و حجم حلال پاشنده، اثر افزایش نمک و pH محلول مورد بررسی قرارگرفت. در شرایط بهینه، عامل تغلیط 60، بازه­ی خطی 50/0- 0/100 میکروگرم بر لیتر، حد تشخیص 2/0 میکروگرم بر لیتر و انحراف استاندارد نسبی (RSD) کم­تر از % 7 به‌دست آمد. نتیجه­ های به دست آمده نشان دهنده مناسب بودن روش مورد استفاده در این کار پژوهشی برای اندازه‌گیری آفت‌کش دیازینون در نمونه‌های حقیقی سیب و آب زیرزمینی می‌باشد.

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مراجع

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