Conductometric Titration of Nickel (II) in Presence of Chromium (III), Iron(III) and manganese(II), Using edta as the reagent

摘要

Using contact conductometry, nickel was determined by titration with EDTA solution. The determination was carried out in a wide range of pH (from 2.3 to 8.1) and Ni~2+ concentration (5X10~-2 to 1X10~-4 M). It was found that the presence of Cr~3+, Fe~3+, Mn~2+ or SeO_3 ~2+ as cer tain ratios did not have significant effect on the determination of nickel. The method proposed can be used to find nickel concentration in various industrial media: waste waters from sulphuric acid nickelling in galvanic coating facilities where certain contents of Cr~3+, Fe~3+ and Mn~2+ are present, as well as for determination of NiSeO_3 solubility in water. The relative error was about 1% and analysis time did not exceed 5-7 min.