با همکاری مشترک انجمن علوم و فناوری‌های شیمیایی ایران

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

بخش شیمی، دانشگاه پیام نور، صندوق پستی 3697-19395، تهران، ایران

چکیده

در این تحقیق به معرفی کنگو قرمز (CR)، شناساگر رنگزای در دسترس و ساده، به عنوان میزبان شیمیایی گزینش پذیر جدید، برای شناسایی کاتیون مس و آنیون های سیانید و کربنات در محیط آبی که قادر است به صورت گزینشی شناسایی و اندازه گیری چندین آنالیت را انجام دهد، پرداخته شد. افزایش مقدار 5 درصد حجمی/حجمی اتانول باعث افزایش چشمگیر در گزینش سیانید از طریق اثر مهاری بر مزاحمت آنیون سولفیت ایجاد کرد. ویژگی های حسگری کنگو قرمز در مخلوط حلالی آب- اتانول (95:5) مورد بررسی قرار گرفت و گزینش پذیری بسیار بالایی در مقابل آنیون سیانید حاصل شد. مکانیسم شناسایی منطقی این روش به وسیله تکنیک های اسپکتروفتومتری فرابنفش-مرئی، اسپکتروسکوپی FTIR و فلورسانی مورد تائید قرار گرفت. حد تشخیص برای این کاوشگر جدید 90 و 20 nmol L-1 به ترتیب به روش رنگ سنجی و فلورسانی اندازه گیری شد، که بسیار کمتر از ماکزیمم حد مجاز سازمان سلامت جهانی(WHO) (9/1µmol L-1) و حد تشخیص گزارش شده توسط بسیاری از حسگرهای شیمیایی برای تشخیص سیانید می باشد. از طرفی کمپلکس سیانید با کنگو قرمز-مس توانایی تشخیص 15 nmol L-1 از آنیون کربنات را با پاسخ دهی در زمان کوتاه (کمتر از 30 ثانیه) و تشخیص با روش فلورسانی در حضور سایر آنیون ها نشان داد. بسته به ترتیب افزایش یون های مس، سیانید و کربنات، محلول کنگو قرمز به عنوان یک قفل صفحه کلید با ورودهای مس، سیانید و کربنات عمل کرد. ورودهای یونی به رنگزا جدید مشابه قفل و کلید مولکولی الکترونیکی عمل می کنند. نتایج به صورت موفقیت آمیزی با داده های حاصل از روش مرجع اسپکتروفتومتری برای یون های سیانید مقایسه شد. این روش را برای تشخیص و تخمین کمّی یون های سیانید و کربنات در نمونه های حقیقی متنوع، ممکن می سازد از مزایای تجزیه ای این روش، شناسایی یون سیانید در پساب های آبکاری فلز(EPWW) ، سرم خون انسان، نمونه های آب معدنی و آب آشامیدنی است که نتایج با شیوه های استاندارد معمول، مقایسه شده است.

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