Heterometric microdetermination of cobalt using nitron as titrant |
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Authors: | Salah Shahine MFathy Elshahat Soad Khamis |
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Institution: | Chemical Research Laboratory, Faculty of Engineering, Ain Shams University, Abbassia, Cairo, Egypt |
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Abstract: | Small amounts of cobalt (0.1–0.25 mg in 15 ml solution) were determined heterometrically in the presence of potassium thiocyanate by titration with nitron acetate solution. A strong electrolyte (Na2SO4) must be added to obtain a clear end point. The titration can be carried out in the presence of a number of diverse ions e.g., Cd2+, Ni2+, Pb2+, Mn2+, Cr3+, MoO42?, WO42, CrO42?, NO3?, Au3+, Pt4+ without interference; Fe3+ can be masked with NaF. Copper and zinc interfere and must be absent. The titration takes about 2–3 min. and the maximum error was 1.5%. |
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