Direct atomic absorption spectrometric determination of chromium, cobalt and nickel in fish protein concentrate and dried fish solubles

Abstract

Solid-sampling atomic absorption spectrometry was used for the determination of chromium, cobalt and nickel in four types of fish protein concentrate and a sample of dried fish solubles. The samples (0.3–10 mg) were introduced through the injection port of the graphite furnace by means of a special injector. The metals in the fish protein concentrate were determined from peak height measurements, by comparison with the International Atomic Energy Agency reference standard Dried Fish Solubles as the solid standard. The contents (in ppm) of chromium, cobalt and nickel were found to lie in the ranges 0.2–1.8, 0.07–0.3, and 0.7–2.8, respectively; the relative standard deviations were 5–16%.