Abstract
Milk is known to contain organohalogen compounds. A mixture of hexane and isopropanol was used to extract lipids from bovine milk and neutron activation analysis (NAA) was employed to measure extractable organohalogens in the lipids. The samples were irradiated in a neutron flux of 2.5 × 1011 cm2 s−1 for 10 min, allowed to decay for 2 min, and counted for 10 min. Uncertainties associated with the preconcentration NAA measurements were investigated in detail. The mass fractions of halogens in mg kg−1 and their relative expanded uncertainties in percent in bovine milk lipids were: 32 (8.4 %), 2.65 (9.8 %) and 0.211 (6.6 %) for Cl, Br and I, respectively.
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Acknowledgments
The authors would like to acknowledge the assistance of Dr. J. Holzbecher and Blaine Zwicker of the DUSR facility for irradiations. The financial assistance from NSERC Canada in the form of a research grant, and the Dalhousie University Faculty of Graduate Studies for a scholarship (K.I-O.) are also acknowledged.
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Isaac-Olive, K., Chatt, A. Expanded uncertainties of preconcentration neutron activation measurements of extractable organo-chlorine, bromine and iodine compounds in bovine milk lipids. J Radioanal Nucl Chem 302, 1213–1224 (2014). https://doi.org/10.1007/s10967-014-3520-4
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DOI: https://doi.org/10.1007/s10967-014-3520-4