title: Solid-phase extraction of metal ions and their estimation in vitamins, steel and milk using 3-hydroxy-2-methyl-1,4-naphthoquinone-immobilized silica gel.
abstract: 3-Hydroxy-2-methyl-1,4-naphthoquinone-immobilized silica gel has been used for the adsorption and estimation of copper, cobalt, iron and zinc by both batch and column techniques. The distribution coefficient D determined for each metal ion was as follows (ml g(1)): Fe, 3.6 x 10(2); Cu, 3.9 x 10(2); Co, 3.8 x 10(2); Zn, 4.1 x 10(2). Methods have been developed to estimate zinc, copper and cobalt in milk, steel and vitamin samples respectively.
authors.forename: B S
authors.initials: BS
authors.lastname: Garg
authors.forename: J S
authors.initials: JS
authors.lastname: Bist
authors.forename: R K
authors.initials: RK
authors.lastname: Sharma
authors.forename: N
authors.initials: N
authors.lastname: Bhojak