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

Copper was determined by flow injection spectrophotometry at 370 nm after extraction of copper(II) bis(acetylacetone)ethylenediiminate chelate into chloroform. The carrier stream was deionized water and the reagent streams were acetate buffer (pH 5.0) and 0.2% (w/v) bis(acetylacetone)ethylenediimine solutions. The sampling rate was 20 h−1. The calibration graph was linear up to 100 μg ml−1 copper, based on injection volumes of 250 μl. The relative standard deviation (n = 10) was 1.95% for 20 μg ml−1 copper. The system has been applied to the determination of copper in copper-based alloys and pig feeds.