مهندسی شیمی ایران

مهندسی شیمی ایران

استخراج انتخابی و تعیین نیکل در ادرار کارگران ریخته‌گری با کمک پلیمر قالب یونی مغناطیسی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار شیمی تجزیه، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
2 استادیار مهندسی بهداشت حرفه ای، گروه مهندسی بهداشت حرفهای و ایمنی کار، واحد علوم پزشکی تهران، دانشگاه آزاد اسلامی، تهران، ایران
3 دکترای تخصصی شیمی تجزیه، دانشکدۀ شیمی، دانشگاه شهید بهشتی، تهران، ایران
4 استاد شیمی تجزیه، دانشکدۀ شیمی، دانشگاه شهید بهشتی، تهران، ایران
چکیده
نوع جدیدی از نانوذرات قالب یونی برای استخراج، تغلیظ و اندازه‌گیری سریع یون‌های Ni(II) در نمونه‌های ادرار کارگران ریخته‌گری استفاده‌شد. طراحی باکس- بنکن و روش سطح پاسخ برای بهینه‌سازی مشخصه‌های مؤثر در فرایند‌ پیش‌تغلیظ به‌کاررفت. عوامل اصلی مورد نظر برای بهینه‌سازی جذب سطحی شامل مقادیر pH برابر با 8، زمان جذب سطحی 10 دقیقه و مقدار جاذب 7 میلی‌گرم بود. مرحلۀ شست‌وشو با بررسی چهار متغیر نوع، حجم، غلظت حلال و زمان شست‌وشو بهینه‌شد. مشخصه‌های ذکرشده در این مرحله HCl با مولاریتۀ 9/0 و به‌مقدار mL 3/8 با زمان ماند 5 دقیقه به‌دست‌آمد. پس از مراحل جذب سطحی و شست‌وشو، از طیف‌سنجی جذب اتمی شعله‌ای برای تعیین مقدار یون‌های Ni(II) استفاده‌شد. هم دما‌های تعادل مطالعه‌شد و دو مدل برای تحلیل داده‌های جذب تعادلی به‌کاررفت. نتایج نشان‌داد که فرایند‌ جذب سطحی از مدل لانگمویر پیروی‌می‌کند. حداکثر ظرفیت جذب تک‌لایه و ثابت لانگمویر به‌ترتیب 49/3میلی‌گرم بر گرم و 0/205 لیتر بر میلی‌گرم بود. درنهایت، این نانوجاذب به‌طور موفقیت‌آمیز برای تعیین انتخابی نیکل ادراری در کارگران ریخته‌گری به‌کاررفت و نتایج رضایت‌بخشی به‌دست‌آمد. در همین راستا، تحت شرایط بهینه، حد تشخیص و انحراف معیار نسبی به‌ترتیب
µg/L 0/25و برابر یا کمتر از 9/5% بود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Selective Extraction and Determination of Urinary Nickel in Foundry Workers with the Aid of a Magnetic Ion Imprinted Polymer

نویسندگان English

A. A. Asgharinezhad 1
Z. Panjali 2
N. Jalilian 3
H. Ebrahimzadeh 4
1 Assistant Professor of Analytical Chemistry, Chemistry and Process Research Department, Niroo Research Institute, Tehran, Iran
2 Assistant Professor of Occupational Health Engineering, Department of Occupational Health and Safety Engineering, TeMS.C., Islamic Azad University, Tehran, Iran
3 PhD. in Analytical Chemistry. Faculty of Chemistry and Petroleum Sciences, Shahid Beheshti University, G. C., Evin, Tehran, Iran
4 Professor of Analytical Chemistry. Faculty of Chemistry and Petroleum Sciences, Shahid Beheshti University, G.C., Evin, Tehran, Iran
چکیده English

A new type of magnetic ion imprinted polymer nanoparticles was employed to quickly extract, concentrate, and measure Ni(II) ions in urine samples from foundry workers. The Box-Behnken design and response surface methodology were used to optimize the parameters that affect the preconcentration process. The main factors considered for sorption optimization were pH value (8), sorption time (10 min), and the amount of magnetic imprinted polymer (7 mg). The elution step was optimized by investigating four variables: type, volume, and concentration of the eluent, as well as elution time. Mentioned parameters were 3.8 mL of HCl 0.9 M, for 5 min. After the sorption and elution steps, flame atomic absorption spectrometry was used to quantify the Ni(II) ions.Equilibrium isotherms were studied, and two models were utilized to analyze the equilibrium sorption data. The results showed that the sorption process followed the Langmuir model. The maximum monolayer capacity and the Langmuir constant were49.3 mg g-1 and 0.205 L mg-1, respectively. Ultimately this nanosorbent was successfully applied to the selective determination of urinarynickel in foundry workersand satisfactory results were obtained. Under the optimalcondition the limit of detection and the relative standard deviations was 0.25 μg L-1 and were equal or less than 9.5%, respectively.

کلیدواژه‌ها English

Magnetic Ion Imprinted Polymer Nanoparticles
Ni(II) Ions
Response Surface Methodology
Selective Extraction
Urine Samples
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