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Simultaneous Spectrophotometric Determination of Some Polycyclic Aromatic Hydrocarbons Using Chemometrics Methods after Their Preconcentration by Salting-Out Assisted Liquid-Liquid Extraction | ||
| Iranian Journal of Analytical Chemistry | ||
| مقاله 2، دوره 6، شماره 1 - شماره پیاپی 11، خرداد 2019، صفحه 10-18 اصل مقاله (1.17 M) | ||
| نوع مقاله: Full research article | ||
| شناسه دیجیتال (DOI): 10.30473/ijac.2019.43697.1136 | ||
| نویسندگان | ||
| Ahmadreza Amraei* 1؛ Ali Niazi2؛ Mohammad Alimoradi1؛ Mohammad Hosseini3 | ||
| 1Department of Chemistry, Faculty of Science Islamic Azad University, Arak Branch, Arak, Iran | ||
| 2Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran | ||
| 3Department of Chemistry, Faculty of Science Lorestan University, Poldokhtar Branch, Poldokhtar, Iran | ||
| چکیده | ||
| A rapid, powerful, satisfactory and modified signal-pre-processing method that is a hybrid of the wavelet transform with orthogonal signal correction (OSC) is used for pre-processing of spectrophotometric data of naphthalene, anthracene and pyrene as analytes after their preconcentration by salting-out assisted liquid–liquid extraction (SALLE) method. Water-miscible extraction solvent (1.0 mL of acetonitrile) and a suitable amount of salt (1.0 g of (NH4)2SO4) are added into the aqueous solution (4.0 mL) and dissolved using a vortex leading to the occurrence of phase separation. The target analytes in the sample was extracted into the water-miscible extraction solvent. After extraction, the absorbance of the analytes mixture was measured in the wavelength range of 200-400 nm. The wavelet orthogonal signal correction (WOSC) was established for denoising and reduction of spectrophotometric data and hybrid with partial least squares (PLS) regression method for simultaneous determination of the studied analytes after the SALLE procedure. The influence of various parameters, such as extraction solvent and volume, type and amount of salt, vortex time and sample pH were studied and optimized. The net analyte signal (NAS) method was used for calculating figures of merit. Linear range (LR) of calibration graphs for naphthalene, anthracene and pyrene were between 0.20 - 2.00, 0.10 - 1.50 and 0.07 -1.00 µg mL-1, respectively. The obtained model showed good prediction capability with root mean square error of prediction (RMSEP) of 0.030, 0.024 and 0.013 µg mL-1 for naphthalene, anthracene and pyrene, respectively. The simple WOSC-PLS method has been successfully applied for the simultaneous determination of these analytes in the spiked wastewater samples. | ||
| کلیدواژه‌ها | ||
| Simultaneous Determination؛ Wavelet Orthogonal Signal Correction؛ Salting-Out Assisted Liquid-Liquid Extraction | ||
| عنوان مقاله [English] | ||
| اندازه گیری همزمان اسپکتروفتومتری هیدروکربن های آرماتیک چندحلقه ای با استفاده از روش تصحیح عمودی سیگنال و تبدیل موجک و کمترین مربعات جزئی بعد از پیش‌تغلیظ استخراج مایع-مایع کمک شده با نمک زنی | ||
| نویسندگان [English] | ||
| احمدرضا امرائی1؛ علی نیازی2؛ محمد علیمرادی1؛ سید محمد حسینی3 | ||
| 1گروه شیمی، دانشکده علوم دانشگاه آزاد اسلامی اراک، اراک، ایران | ||
| 2دپارتمان شیمی تهران مرکز، دانشگاه ازاد تهران مرکز، تهران، ایران | ||
| 3گروه شیمی، دانشکده علوم دانشگاه لرستان، شعبه پلدختر، پلدختر، ایران | ||
| چکیده [English] | ||
| یک روش پیش پردازش سیگنال سریع، قدرتمند، رضایت بخش و اصلاح شده که ترکیبی از تبدیل موجک با اصلاح سیگنال عمودی (OSC) است برای پیش پردازش داده های اسپکتروفتومتری نفتالن، آنتراسن و پیرن به عنوان آنالیتها پس از پیش تغلیظ آنها توسط روش استخراج مایع-مایع کمک شده با اثر نمک زنی (SALLE) مورد استفاده قرار گرفته است. حلال استخراج مخلوط در آب (1.0 میلی لیتر استونیتریل) و مقدار مناسب نمک (1.0 گرم از (NH4)2SO4) به محلول آبی (4.0 میلی لیتر) اضافه می شود و با استفاده از یک ورتکس که موجب جداسازی فاز می شود، حل می شود. آنالیت های هدف موجود در نمونه به حلال استخراج کننده وارد می شوند. بعد از استخراج جذب مخلوط آنالیت ها در ناحیه 400-200 نانومتر اندازه گیری میشود. پارامترهای مؤثر بر این روش استخراجی مورد مطالعه و بهینه سازی قرار گرفت. روش پیش پردازش تبدیل موجک و تصحیح عمودی سیگنال برای برداشتن نویز داده های اسپکتروفتومتریک و کوپل با روش مدلسازی کمترین مربعات جزئی برای اندازهگیری همزمان آنالیت های مطالعه شده بعد از فرآیند استخراج مایع-مایع کمک شده با اثر نمک زنی استفاده شده است. ارقام شایستگی روش مطالعه شده با استفاده از روش سیگنال خالص آنالیت تعیین گردید. مدل ارائه شده در این کار دارای توانایی پیشگویی خوب با ریشه میانگین مربعات خطا پیشگویی (RMSEP) به ترتیب برای نفتالن، آنتراسن و پیرن030/0، 024/0 و 013/0 است. روش ساده PLS-WOSC با موفقیت برای اندازه گیری همزمان سه آنالیت در نمونه های پساب آبی استفاده شد. | ||
| کلیدواژه‌ها [English] | ||
| اندازهگیری همزمان, موجک-تبدیل عمودی سیگنال, استخراج مایع-مایع کمک‌شده با نمک زنی | ||
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