Abstract
NIST SRM 1548a Typical Diet has a certified iodine mass fraction value of 0.759 mg kg−1, with a rather large expanded uncertainty (relative value 13.6 %). This might be due to the iodine inhomogeneous distribution in the pooled food material. We have proven that cryogenic grinding of NIST SRM 1548a (at the temperature of liquid nitrogen) yields a free-flowing material, with the standard deviation due to a random inhomogeneity that is lower (by a factor of 3) compared with the original material. We have also proven that no change in the certified iodine value and no contamination with other elements present (even at the sub-µg kg−1 level) occurred during the cryogenic grinding process. Thus, we have obtained a quality control material that sets up more stringent requirements on the validation and quality control procedures of the measurement of iodine mass fraction in complex food matrices.
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