【摘 要】
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The potentiometric titration of cobalt have been proved to be very suitable,because the redox potential of Co2+/Co3+ is+1.803v,the point can be clearly found in the potentiometric titration curve whic
【机 构】
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Jiangsu University of Technology,Chemical and Environmental Engineering,Jiangsu,Changzhou,213001
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The potentiometric titration of cobalt have been proved to be very suitable,because the redox potential of Co2+/Co3+ is+1.803v,the point can be clearly found in the potentiometric titration curve which Co2+ was completely oxidation by oxidants.The titration of Co2+ to 3+ with potassium ferricyanide in strongly ammoniacal medium was precise to determine the content of 2+ cobalt,the content of cobalt from about 18 to 200 mg were titrated with a average error of only +0.02mg[1-4].Then,Lee pointed out potentiometric microtitration of cobalt,the use of polarized Sb reference and Pt indicating were employed in improving the electrode response to determine microgram quantities of cobalt with potassium ferricyanide[5-6].On the other hand,the Na2CrO4 could oxidate Co2+ to determinate the content of cobalt,the relative standard deviation smaller than 1.5 ％has been obtained for 50-300 μmol Co2+[7].
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