علی نیازی
گروه شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی واحد اراک
[ 1 ] - کاربرد PLSو PARAFACدر اندازه‌گیری هم زمان اسپکتروفتومتری اکسی تتراسایکلین، تتراسایکلین و داکسی سایکلین در نمونه‌های عسل
روش ساده، حساس، سریع و دقیق اسپکتروفتومتری برای اندازه گیری همزمان تتراسایکلین (TC)، اکسی تتراسایکلین (OTC) و داکسی سایکلین (DXC) در نمونه های عسل به کارگرفته شد. روش های کمومتریکس برای اندازه گیری ترکیباتی است که با یکدیگر هم پوشانی طیفی دارند. در این تحقیق، دو روش کالیبراسیون کمترین مربعات جزیی (PLS) و آنالیز فاکتورهای موازی ((PARAFAC برای اندازه گیری تتراسایکلین ها استفاده شد. محدوده...
[ 2 ] - Preconcentration based dispersive liquid-liquid microextraction for spectrophotometric determination of zinc in natural water and human blood after multivariate optimization based on Box-Behnken design
A new simple and rapid dispersive liquid-liquid microextraction has been applied to preconcentrate tracelevels of zinc as a prior step to its determination by spectrophotometric method. In the proposed method, 4-(2-pyridylazo) resorcinol (PAR) is used as a chelating agent, and chloroform and ethanol are selected asextraction and dispersive solvent. The optimization strategy is carried out by us...
[ 3 ] - Simultaneous spectrophotometric determination of ampicillin and penicillin in human plasma using multivariate calibration
An analytical methodology based on spectrophotometric and partial least squares (PLS) algorithm for thesimultaneous determination of ampicillin and penicillin in human plasma was developed and validated. Themultivariate model was developed as a binary calibration model and it was built and validated with anindependent set of synthesis and real samples in presence of matrix. It is shown how a de...
[ 4 ] - Spectrophotometric determination of uranium in water samples after cloud point extraction using nonionic surfactant Triton X-114
A cloud point extraction process using the nonionic surfactant Triton X-114 to extracturanium from aqueous solutions was investigated. The method is based on the complexationreaction of uranium with Arsenazo III and micelle-mediated extraction of the complex. Theoptimal extraction and reaction conditions (e.g., pH, reagent concentration, effect of time) werestudied, and the analytical character...
[ 5 ] - Design novel optical sensor for determination of bismuth based on immobilization of 4-(4-nitrophenyl)-1-naphthol on a triacetylcellulose membrane
A novel optical sensor has been proposed for sensitive determination of bismuth ion basedon immobilization of 4-(4-nitrophenylazo)-1-naphthol on a triacetylcellulose membrane.Chemical binding of bismuth ions in solution with a 4-(4-nitrophenylazo)-1-naphtholimmobilized on the triacetylcelluse surface could be monitored spectrophotometrically. Theoptode shows excellent response over wide concent...
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