Selective preconcentration and determination of iodine species in milk samples using polymer inclusion sorbent |
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Authors: | PR Bhagat R Acharya NS Rajurkar |
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Institution: | a Department of Chemistry, University of Pune, Pune 411007, India b Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India |
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Abstract: | A method to determine low levels of iodine species namely I− and IO3− in aqueous samples was developed and applied to milk and milk powder samples. It is based on selective preconcentration of I− in polymer inclusion sorbent (PIS) and neutron activation analysis (NAA) of I− sorbed in PIS. The PIS was found to be highly selective for I− in presence of IO3− and other anions commonly present in the milk samples. In order to preconcentrate total I− + IO3− content in the PIS, IO3− was reduced to I− using a mixture of acetic acid and ascorbic acid. It was found that total iodine content in milk could be determined with epithermal neutron activation analysis (ENAA). A scheme was developed to determine I−, IO3− and total iodine. The developed method was applied to milk reference materials (NIST SRM-1549 and IAEA-RM-153 milk powder) and a commercially available milk powder. The scheme for estimation of iodine in different forms was validated by using reference material NIST SRM-1549. |
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Keywords: | Iodine species Milk Polymer inclusion sorbent Selective preconcentration Neutron activation analysis |
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