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9Horwitz W. Official methods of analysis of the association of official analytical chemists[M]. 14th ed. Washington: Association of Official Anaiytic Chemists, 1984. 880-882.
10Nadiger HA ,Krishnamachari KA,Naidu AN, et al. Use of common salt(sodium chlorideofortified with iron to control anemia result of a preliminary study[J]. Brit J Nutr, 1980,43-45.