استفاده از روش هاي الكترو شيميايي همراه با روش هاي كمومتريس به منظور اندازه گيري كاتيون هاي فلزي مس، موليبدن، سيموت، واناديوم و اورانيوم به صورت همزمان يا مجزا

چكيده انگليسي :

AbstractIn this thesis stripping voltammetry method in conjunction with chemometrics methods waspresented for individual or simultaneous determination of cations of Cu II Mo VI Bi III V V and U VI In the first part one reliable and sensitive procedure for the simultaneous determination oftrace levels of copper and molybdenum is proposed The complexing of copper II andmolybdenum VI with Pyrogallol red is analyzed by cathodic stripping differential pulsevoltammetry based on the adsorption collection of the complexes onto a hanging mercurydrop electrode The effect of chemical and instrumental parameters on the sensitivity andselectivity were studied A standard addition method was utilized for the analysis ofvoltammogram data under the optimal conditions The linear dynamic range was achievedover the range of 2 0 70 0 and 0 8 80 0 ng ml and the detection limits of 0 3 and 0 1 ng mlfor Cu II and Mo VI respectively The capability of the method for the analysis of realsamples was evaluated by the determination of copper and molybdenum in several syntheticand real samples In part two a reliable and very sensitive procedure for the determination of ultra trace ofmolybdenum is proposed Molybdenum was determined by cathodic stripping differentialpulse voltammetry based on the adsorption collection of the Mo VI Tiron complex on ahanging mercury drop electrode HMDE The variation of peak current with severalinstrumental and chemical parameters were optimized Under optimial conditions therelationship between the peak current and molybdenum concentration is linear in the range of0 010 21 0 ng ml The limit of detection was found to be 0 006 ng ml The method wasapplied for the determination of molybdenum in some real samples include water samples plant foodstuff and certified steel reference materials In part three a new method is proposed for the determination of bismuth and copper in thepresence of each other based on adsorptive stripping voltammetry of complexes of Bi III chromazorul S and Cu II chromazorul S at a hanging mercury drop electrode Copper is aninterferent element for the determination of Bi III because the voltammograms of Bi III andCu II overlapped with each other Continuous wavelet transform CWT was applied toseparate the voltammograms In this regards wavelet filter resolution of the peaks and thefitness were optimized to obtain minimum detection limit for the elements It was realized thatcopper imposes a matrix effect on the determination of Bi III and the standard additionmethod was able to cope with this effect In part four a procedure is presented for the simultaneous determination of ultra traceamounts of vanadium and molybdenum based on adsorptive cathodic stripping voltammetry Adsorptive accumulation of the V V and or Mo VI with chromoxane cyanine R CCR ontoa hanging mercury drop electrode followed by reduction of the adsorbed species usingdifferential pulse voltammetry method Under the optimized conditions linear dynamic rangefor V V and Mo VI are in the range of 0 3 24 0 and 0 1 30 0 ng ml respectivly Detectionlimits of 0 1 and 0 08 ng ml were achieved for V V and Mo VI respectively In the last part a new method is presented for the sequential determination of uranium andvanadium based on cathodic adsorptive stripping voltammetry of complexes of U VI andV V with chromoxane cyanine R CCR at a hanging mercury drop electrode Cyclicvoltammetric method was used for studying the electrochemical behavior of U VI in thepresence and absence of CCR Influence of effective parameters on the sensitivity andselectivity were studied Although the optimized pH for determination of uranium is acetatebuffer pH 6 This conditions for the determination of vanadium include acetate buffer of pH3 8 Under the optimal conditions the peak current of uranium is proportional to the uraniumconcentration over the range o 1 32 0 ng ml and that for vanadium is linear over the range of0 3 24 0 ng ml The detection limits S N 3 obtained under the optimal

خالو، شكوه السادات

استفاده از روش هاي الكترو شيميايي همراه با روش هاي كمومتريس به منظور اندازه گيري كاتيون هاي فلزي مس، موليبدن، سيموت، واناديوم و اورانيوم به صورت همزمان يا مجزا

تبديل موجك , ولتامتري , تجزيه عاري سازي , موجك پيوسته، گسسته , غلظت ليگاند، كلرات , غلظت كرومازول