Flow-injection spectrophotometric determination of copper using bis(cyclohexanone) oxalyldihydrazone

✍ Scribed by N. Chimpalee; D. Chimpalee; S. Srithawepoon; T. Patjarut; D.Thorburn Burns

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 350 KB
• Volume: 304
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00564-3

✦ Synopsis

Copper can be determined spectrophotometrically at 600 nm based on the reaction of copper(H) and bis(cyclohexanone)oxalyldihydrazone using flow-injection analysis. The carrier stream was distilled water and the reagent streams were 27% (w/v) citric acid solution, 37% (v/v> ammonia solution and 0.18% (w/v) bis(cyclohexanone)oxalyldihydrazone solution. The calibration graph was linear up to 20 pg ml-' copper and the relative standard deviation for the determination of 5 pg ml-' of copper was 0.92% (n = lo), the detection limit was 0.13 pg ml-' copper, both based on injection volumes of 250 ~1. The system has been applied to the determination of copper in steels, copper-based alloys and pig feeds and to monitoring copper in an alkaline scale removal process.