نوع مقاله : مقاله پژوهشی کامل
نویسندگان
بخش شیمی، دانشکده علوم، دانشگاه یاسوج، یاسوج، ایران
چکیده
یک حسگر نوری بر پایه نشاندن واکنشگر اریوکروم سیانین‌آر به روی غشاء تری استیل سلولز برای اندازهگیری یون آلومینیوم (III) طراحی شد. این حسگر نوری دارای پاسخ برگشت‌پذیر و تکرار‌پذیر میباشد. در اثر بر همکنش انتخابی اریوکروم سیانین‌آر موجود در غشاء با یون آلومینیوم، رنگ غشاء از صورتی به بنفش در0/6pH= تغییر می‌کند. درشرایط بهینه، روش دارای پاسخ خطی غلظت یون آلومینیوم (III) از 8-10×22/3 تا 5-10×10/4 مولار و حد تشخیص آن 8-10×2/1 مولار میباشد. جزئیات محاسبه خطی، حد تشخیص، حساسیت، گزینشپذیری و زمان پاسخ مورد بحث قرار گرفت. پاسخ حسگر وابسته بهpH بود. پاسخ غشاء به یون آلومینیوم (III) غیر برگشتی و شامل تغییر رنگ از صورتی به آبی بود. غشاء از طریق گذاشتن در محلول 1/0 مولار EDTA در کمتر از 30 ثانیه قابل برگشت برای اندازهگیریهای بیشتر میباشد. زمان پاسخ غشاء کمتر از 16 دقیقه بر حسب غلظت آلومینیوم میباشد. تکرارپذیری و تکثیرپذیری پاسخ غشاء به ترتیب 62/1 و 3 درصد بدست آمد. حسگر پاسخ گزینشپذیری را نسبت به آلومینیوم (III) در مقابل کاتیونهای دیگر نظیر Zn(II)، Cu(II)، Fe(III)، Ni(II) و Co(II) از خود نشان میدهد. حسگر برای اندازهگیری آلومینیوم (III) در آبهای شرب و شربت منیزیم-آلومینیوم استفاده شده است.
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