Cadmium determination of frozen cod: An interlaboratory comparison
Slabyj, Bohdan M. | Koons, Robert D. | Bradbury, Harry E. | Martin, Roy E.
Extract: Results of analyses of cod portions by 8 laboratories indicate that a substantial lack of agreement exists among laboratories and methods for cadmium (Cd) analysis. Consistent results for cod samples of low Cd content (biologically bound) were reported by only 3 of 8 participating laboratories. These laboratories reported a mean Cd content of 0.323 ppm, with a coefficient of variation of 38%. Results were better when cod samples were spiked with Cd acetate at the 78 ppm level. Six of the 8 laboratories correctly reported that Cd content at the 78 ppm level (mean 71.2 ppm, with a coefficient of variation of 13%). Lack of consistency in determining biologically-bound Cd in cod tissue is attributed, in part, to loss of Cd during dry-ashing of tissue. Laboratories utilizing atomic absorption spectrophotometry or neutron activation analysis generally reported more accurate results than the laboratory utilizing argon-plasma atomic emission spectrometry. (author)
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