نوع مقاله : مقاله پژوهشی کامل
نویسندگان
1 گروه شیمی دریا، دانشکده علوم دریایی، دانشگاه دریانوردی و علوم دریایی، چابهار، ایران
2 گروه شیمی، دانشکده علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران
3 استفاده از طراحی باکس- بنکن در بهینه سازی استخراج فاز جامد در سرسمپلر با جاذب نانولولة کربن اصلاح شده برای تعیین اسپکتروفتومتری مالاشیت سبز در آبهای خلیج چابهار
چکیده
در این کار تحقیقاتی تعیین مالاشیت سبز، که یک رنگ آلوده‌کننده آب میباشد، توسط اسپکتروفتومتری شرح داده شده است. ابتدا یک پلی آمین انشعاب‌دار محلول در آب با استفاده از واکنش باز‌کردن حلقه ی نوکلئوفیلی دیپوکسی و مونومر دیامین تهیّه شده و برای عامل‌دار کردن نانوتیوب های کربن چندجداره استفاده گردید. این ترکیب (با علامت اختصاری(WHPA-OMCNT به عنوان یک جاذب کارآمد برای استخراج مالاشیت سبز از نمونه های آب دریای خلیج چابهار به کار رفت. از WHPA-OMCNT در جاذب استخراج فاز جامد سرسمپلر استفاده شد و پارامترهای مختلف موثر بر کارآئی استخراج، از جمله نوع و حجم حلال شوینده، حجم نمونه، تعداد سیکل‌های استخراج و شویش، pH محلول نمونه، نوع و مقدار نمک و غلظت مادّة فعّال سطحی (تریتون 114-X) با استفاده از روش‌های یک متغیر در یک زمان و سطح پاسخ (باکس-بنکن) با کاربرد 7 فاکتور در سه سطح بهینه شدند. تحت شرایط بهینه، محدودة خطّی منحنی درجه بندی روش پیشنهادی برای مالاشیت سبز 250-4 میکروگرم بر لیتر بدست آمد و حدّ تشخیص روش 80/0 میکروگرم بر لیتر با تکرارپذیری RSD)) بهتر از 4/6% محاسبه گردید.
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