application of modified nanoclay sorbent for separation and preconcentration trace amount of cobalt
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abstract
the present article reports on the application of modified organo nanoclay as a green, easily prepared and stable solid sorbent for the preconcentration of trace cobalt ion in aqueous solution. the organo nanoclay was modified by adsorption of 5-(4-dimethyl amino-benzylidene) rhodanin reagent onto it. the sorption of co2+ ions was quantitative in the ph range of 7.0 to 8.5, whereas quantitative desorption occurs instantaneously in 5.0 ml of 2.0 mol l-1 hno3. the eluted solution was aspirated directly into the flame of atomic absorption spectrometry (faas). linear range for determination of cobalt was maintained between 0.176 ng ml-1 to 15.0 μg ml-1 in initial solution. relative standard deviation for ten replicated determination of 1.0 μg ml-1 of cobalt was ±2.34% . detection limit was 0.1 ng ml-1 in initial solution (3sbl, n=10) and preconcentration factor was 170. the sorption capacity of modified nanoclay for co (ii) was evaluated 0.56 mg per g of sorbent. the effects of the experimental parameters, including the sample ph, flow rates of sample and eluent solution, eluent type, breakthrough volume and interference ions were studied for preconcentration of co2+. the proposed method was applied for determination of cobalt in water samples.
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Journal title:
international journal of nanoscience and nanotechnologyPublisher: iranian nano society
ISSN 1735-7004
volume 7
issue 1 2011
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