title: Determination of trace amounts of manganese in nickel by fourth-derivative spectrophotometry.
abstract: Fourth-derivative absorption spectra were used to determine trace amounts of manganese in nickel salts. Optimum conditions for the oxidation of microgram amounts of Mn(II) to MnO(-)(4) in the presence of large amounts of nickel were established. Fourth-derivative spectra provided good sensitivity and selectivity for this determination. Attention has been paid to the effect of instrumental parameters on the results obtained. Limitations of the peak-to-trough and zero-crossing measurement techniques have been examined. Manganese (1 x 10(-3)-2 x 10(-5)%) in nickel salts (nitrate, sulphate and chloride) and in nickel powder was determined with good precision and accuracy.
authors.affiliation: Department of Analytical Chemistry, Technical University, Warsaw, Poland.
authors.forename: S
authors.initials: S
authors.lastname: Kuś
authors.forename: Z
authors.initials: Z
authors.lastname: Marczenko