Abstract
A simple and sensitive flow injection-flame atomic absorption spectrometric (FI-FAAS) method was developed for on-line preconcentration and determination of trace levels of cobalt(II). A mini-column packed with a chloromethylated polystyrene, functionalized with N,N-bis(naphthylideneimino)diethylenetriamine (PS-NAPdien) was used for on-line enrichment of cobalt(II) from samples at pH 7.0. All chemical and flow variables were optimized. Under the optimum conditions, calibration graph was linear over the concentration ranges of 1.0-80.0 and 0.30-40.0 µg L-1 for preconcentration of 10.0 and 20.0 mL solutions, respectively. The limits of detection (LODs) values for preconcentration of 10.0 and 20.0 mL sample solutions were 0.75 and 0.25 µg L-1, respectively. An enrichment factor of 110 for a sample volume of 10.0 mL was obtained. The relative standard deviations for 10 replicate determinations of cobalt(II) at the 10.0 and 60.0 µg L-1 levels were 4.7 and 3.3%, respectively. The accuracy of the proposed method was demonstrated by determining Co(II) in different spiked water samples.
Highlights
Cobalt is an essential element for humans and animals because it is associated with the synthesis of vitamin B12
Atomic spectrometric methods are extensively employed for the quantification of metal species.[1]
Its main problem is the low sensitivity for some elements at the μg L-1 level
Summary
Cobalt is an essential element for humans and animals because it is associated with the synthesis of vitamin B12. The mini-column packed with this newly functionalized polystyrene was used for rapid FI-FAAS preconcentration and determination of trace amounts of cobalt in various water samples.
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