Визначення Кобальту в харчових продуктах

Abstract

Дана робота присвячена вивченню можливості спектрофотометричного визначення Кобальту в харчових продуктах з використанням реагентів N’-[1-метил-3-оксо-3-фенілпропілен]нафталін-2-карбогідразону (1-нафтоїл-3-метил-5-феніл-5-оксипіразолон) та астрафлоксину FF.

The interaction of Co(II) with N’-[1-methyl-3-oxo-3-phenylpropilen]naphtalin-2-carbohydrazones and astrafloksinum FF have been investigated for obtaining of ionic associates which are suitable for development of extraction-photometric determination of Cobalt. It is shown that Co(II) in the alkaline environment in presents H₂O₂ oxygenized to Co(III) and formation of ionic associates with studies reagents. The high selectivity of Cobalt ionic associates formation was observed and in result it is possible to use these analytical forms for extraction-photometric determination of Cobalt with next chemical-analytical characteristics: ε₅₆₁= 5,3×10⁴; LOQ – 0,0236 ppm; superior limit of determination – 5,9 ppm. The new procedure of Cobalt extraction-photometric determination was developed and approved on the samples of food products. The developed procedures are simple in implementation and have satisfactory metrology characteristics.