A novel chelating adsorbent was successfully synthesized by cross-linking of 4, 4', 4"-s-triazine-1, 3, 5-triyltri-p-aminobenzoic acid as a linker with nanosheets graphene oxide to provide 3-dimensional framework. Therefore, the adsorption process Cd2+ and Pb2+ on investigated employing an ultrasonic bath. The optimum condition containing small amount (10 mg) for both metals at pH=8 pH=5 Pb2+, ...

5,10,15,20-Tetraferrocenyl porphyrin, H2TFcP, a simple example of a donor-acceptor system, was tested as ligand for the development of a novel multi-transduction chemical sensors aimed at the determination of transition metal ions. The fluorescence energy transfer between ferrocene donor and porphyrin acceptor sub-units was considered. The simultaneously measured optical and potentiometric resp...

Poly(1,5-diaminonaphthalene) has been electropolymerized on the screen-printed device with a three-electrode configuration. The modified electrodes have developed as new electrode for electrochemical determination of trace levels lead ions (Pb2+). poly(1,5-diaminonaphthalene) film prevents deposition Pb2+ into surface defects bare carbon and possesses sensitivity to heavy metal thanks amine sec...

A series of novel mono- and di-substituted N-n-butyl-1,8-naphthalimide derivatives were synthesized simultaneously via a three-step reaction. The single crystal structure of N-n-butyl-4-[N',N'-bis(2',4'-dichlorobenzoyl)ethylamino]-1,8-naphthalimide (3f) was determined. The UV-vis and fluorescence properties of compound 3f were investigated. The 3f showed highly selective and sensitive fluoresce...

A highly sensitive and selective spectrophotometric method for the determination of traces of Lead in water after pre-concentration using Mercapto sephadex (MS-50) has been developed. The method is based on the color reaction of lead (II) with dichlorohydroxyl phenyl porphyrin. Under the optimum condition, Pb(II) reacts with reagent to from 1:2 yellow complex in presence of Triton X-100, which ...

Pb(II) can cause serious damaging effects to human health, and thus, the study of Pb2+ detection methods to sensitively and selectively monitor Pb(II) pollution has significant importance. In this work, we have developed a label-free fluorescence sensing strategy based on a Pb(II) DNAzyme cleavage and the ThT/G-quadruplex complex. In the presence of Pb(II), a G-rich tail was cut and released fr...

The title compound, [Pb(2)(C(2)H(3)O(2))(4)(C(8)H(10)O(2))](n), has a polymeric structure, with acetatolead(II) chains and 2,5-dimethyl-benzene-1,4-diol mol-ecules forming bridges between two Pb(II) ions from neighbouring chains. Each Pb(II) centre is surrounded by eight O atoms; four belong to bidentate acetate ions, three to neighbouring bridging acetate groups and one to the 2,5-dimethyl-ben...

Flat-sheet-supported liquid membranes incorporating lasalocid A (a natural ionophore), were previously shown to be permeable to metal cations (Cd2+ and Zn2+) against a proton gradient (∆pH), which is the driving force of the process [1]. This transport process has been extended to other metal species such as Pb2+, Na+, and Ag+ and also to the case where two metal species compete for transport. ...

Inorganic lead has been measured in high concentrations in certain streams in Brazil. This study has evaluated the osmoregulatory effects of lead on the native freshwater red crab Dilocarcinus pagei. In order to probe its osmoregulatory and tissue volume regulatory capabilities and how it would be affected by lead, the crab has been submitted to individual and combined salt and chemical stresse...