Selective extraction and release using (EDTA-Ni)-layered double hydroxide coupled with catalytic oxidation of 3,3',5,5'-tetramethylbenzidine for sensitive detection of copper ion.

摘要: Abstract Copper is an important heavy metal in various biological processes. Many methods have been developed for detecting of copper ions (Cu 2+ ) aqueous samples. However, easy, cheap, selective and sensitive method still desired. In this study, a extraction-release-catalysis approach has detection ion. Ethylenediaminetetraacetic acid (EDTA) chelated with nickel ion (Ni were intercalated layered double hydroxide via co-precipitation reaction. The product was subsequently applied as sorbent dispersive solid-phase extraction the enrichment Cu at pH 6. Since stronger complex formation constant EDTA, Ni exchanged selectively. resulting containing transferred to catalyze 3,3′,5,5′-tetramethylbenzidine oxidation reaction, since could be released by effectively high catalytic ability Blue light emitted from measured ultraviolet–visible spectrophotometry determination . temperature, time, catalysis time optimized. results showed that provided low limit 10 nM, wide linear range (0.05–100 μM) good linearity ( r 2  = 0.9977). optimized conditions environmental water Using example, work new interesting convenient efficient cations