The World Health Organization recommends that infants should be breastfed exclusively for at least six months after birth. After this period, it is recommended to start introducing complementary foods, in order to meet the child´s nutritional, mineral and energy needs. Commercial food products for infants form an important part of the diet for many babies. Thus, it is very important that such food contains sufficient amounts of minerals. Inadequate complementary feeding is a major cause of high rates of infant malnutrition in developing countries. In this study, essential elements: Ca, Cl, Co, Cr, Fe, K, Mg, Mn, Na, Se and Zn and toxic elements: As, Cd, Hg levels were determined in twenty seven different commercial infant food product samples by Instrumental Neutron Activation Analysis (INAA) and Atomic Absorption Spectrometry (AAS). In order to validate both methodologies the reference material: INCT MPH-2 Mixed Polish Herbs and NIST-SRM 1577b Bovine Liver by INAA and NIST-SRM 1548a Typical Diet and NIST-SRM 1547 Peach Leaves by AAS were analyzed. The twenty seven baby food samples were acquired from São Paulo city super markets and drugstores. Essential and toxic elements were determined. Most of the essential element concentrations obtained was lower than the World Health Organization requirements, while concentrations of toxic elements were below the tolerable upper limit. These low essential element concentrations in these samples indicate that infants should not be fed only with commercial complementary foods. radionuclídeos de meia-vida curta (meia-vida < 15 horas)........... 6.3.3. Preparação e irradiação para a determinação dos radionuclídeos de meia-vida longa (meia-vida > 1dia
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