data for Co(II) in this sample (4) agree well with those obtained by lophine CL after Chelex treatment, although the uncertified NBS value for Co(II) in this sample is 0.18 pg/g, a value 33% lower than that obtained by three independent methods with three independent operators. The ratios of Ca, Mg, and Fe to Co in the bovine liver are approximately 700, 3400, and 1500, respectively.
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