multiwavelength pectrophotometric determination of stability constants of 4-(2– thiazolylazo) resorcinol (tar) with la3+, y3+ and th4+ in organic-water mixed solvents by chemometrics method & simultaneous spectrophotometric determination of lead, copper and nickel using xylenol orange by partial least squares calibration method

thesis
abstract

تشکیل کمپلکس های tarبا یون های لانتانیم, ایتریم و توریم در دمای 25 درجه، قدرت یونی ثابت 0.1 مولار و در ph ثابت در مخلوط حلال های اتانول – آب و استونیتریل – آب با استفاده از روش های اسپکتروفوتومتری مورد بحث و بررسی قرار گرفت. داده های اسپکتروفوتومتری با استفاده از نرم افزار squad پردازش شدند تا ثابت های تشکیل کمپلکس اندیکاتور – فلز را محاسبه کند. نتایج نشان می دهد که درصد حلال آلی در مخلوط حلال ها, مقادیر ثابت های پایداری به دست آمده را تحت تاثیر قرار می دهد.به طور شگفت آوری ثابت های پایداری با افزایش درصد حلال آلی کاهش می یابند که نتیجه به دست آمده ناشی از پایداری اجزا درگیر در واکنش تشکیل کمپلکس بوسیله اجزا مخلوط حلال می باشد.

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document type: thesis

وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم

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