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Mohammad Mazloum Ardakani Pouran Pourhakak Masoud Salavati-Niasari 《Analytical sciences》2006,22(6):865-870
A coated-wire ion-selective electrode (CWISE), based on a Schiff base as a neutral carrier, was successfully developed for the detection of Pb(II) in aqueous solution. CWISE exhibited a linear response with a Nernstian slope of 29.4 +/- 0.5 mV/decade within the concentration range of 1.0 x 10(-5) - 1.0 x 10(-1) M lead ion. CWISE has shown detection limits of 5.0 x 10(-6) M. The electrode exhibited good selectivity over a number of alkali, alkaline earth, transition and heavy metal ions. This sensor yielded a steady potential within 10 to 20 s at a linear dynamic range. The electrode was suitable for use in aqueous solutions in a pH range of 2.0 to 5.0. Applications of this electrode for the determination of lead in real samples and as indicator electrode for potentiometric titration of Pb2+ ion using K2CrO4 are reported. 相似文献
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Film splitting necessarily occurs in roll coating and unwanted droplets can occur at high machine speeds when the resulting
filaments break up. To study this ‘misting’ problem, an apparatus was designed and built to simulate filament fluid mechanics.
The device creates a filament by elongating a liquid bridge and stretches the filament at a high and constant rate of acceleration
to mimic coating machine kinematics. Filament breakup was observed using a high-speed video camera and the images were analyzed
to yield droplet size and number. With Newtonian fluids, a single droplet formed at Ohnesorge (Oh) numbers less than 0.1 and
more and smaller droplets were produced at Oh numbers above 0.1. Associative polymer solutions, prepared as weakly elastic
fluids to represent industrial coatings, produced even more and smaller droplets, but only for Ohnesorge numbers in the range
of 0.01 to 0.1. 相似文献
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A kinetic study of the electron-transfer in the reaction of tribenzylchlorotin with potassium 12-tungsto cobalt(Ⅲ) ate ion, K_5[CoW_(12)O_(40)],abbreviated as Co(Ⅲ)W,has been performed in different solvents.The studies were carried out in methanol, ethanol,acetonitrile and acetic acid/water.The rate constants,reaction rates and activation parameters were calculated. Our findings show that the rate of disappearance of the Co(Ⅲ) is pseudo-first order.The kinetic data is strongly affected by used solvents.T... 相似文献
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