نوع مقاله : مقاله پژوهشی کامل
نویسندگان
1 بخش شیمی، دانشکده علوم، دانشگاه گیلان، رشت، ایران
2 بخش شیمی، دانشکده علوم، دانشگاه کردستان، سنندج، ایران
چکیده
یک روش استخراج فاز جامد بر مبنای جاذب سیلیکا ژل عاملدارشده، برای پیش تغلیظ و اندازهگیری مقادیر ناچیز جیوه (II) توسط اسپکترومتری جذب اتمی بخار سرد ارائه گردید. پارامترهای مؤثر بر استخراج جیوه با استفاده از دو روش بهینه گردیدند: طراحی فاکتوریال جزئی و طراحی ترکیب مرکزی. فاکتورهای مؤثر بر بازیابی آنالیت به روش ناپیوسته مورد بررسی قرار گرفتند. بهترین شوینده برای واجذبی جیوه 5 میلی لیتر تیواوره 1/0 مولار بود. مزاحمت تعداد زیادی از آنیونها و کاتیونها بررسی و روش انتخابپذیری خیلی بالایی را برای تعیین جیوه در حضور سایر یونها از خود نشان داد. تحت شرایط بهینه منحنی تجزیهای در گستره 1600-10 نانوگرم بر لیتر با حد تشخیص 3/2 نانوگرم بر لیتر تعیین گردید. روش بطور موفقیتآمیزی برای تعیین جیوه در نمونههای آب شیر، رودخانه و دریا، ادرار و ماهی بکار گرفته شد. نتایج بدست آمده منطبق بر نتایج بدست آمده توسط اسپکترومتری جذب اتمی الکترومال بودند. T-تست دلالت بر اعتبار و صحت روش پیشنهادی برای آنالیز جیوه در نمونههای حقیقی داشت.
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