Flow injection extraction spectrophotometric determination of nickel using bis(acetylacetone)ethylenediimine

Nickel was determined by flow injection spectrophotometry at 370 nm after extraction of nickel(II) bis(acetylacetone) ethylenediiminate chelate into chloroform. The carrier stream was deionized water and the reagent streams were phosphate buffer (pH 7.0) and 1.5% (w/v) bis(acetylacetone)ethylenediimine solutions. The reaction stream was heated to 60 degrees C and then cooled to room temperature prior to extraction into chloroform. The sampling rate was 18 h(-1). The calibration graph was linear up to 25 mu g ml(-1) nickel, based on injection volumes of 250 mu l. The relative standard deviation (n=10) was 0.98% for 20 mu g ml(-1) nickel. The system has been applied to the determination of nickel in nickel-copper alloys and in synthetic electroplating solutions. (C) 2000 Elsevier Science B.V, All rights reserved.