A sensitive and simple method for simultaneous preconcentration of trace heavy metal ions in some cerealand vegetable samples has been reported. The method is based on the adsorption of Cu2+, Fe3+, Zn2+ and Pb2+on 2-(2-nitro-phenylazo)-naphthalen-1-ol (NPN) loaded on activated carbon (AC). The adsorbed metals onactivated carbon were eluted using 3 ml 4 mol L−1 nitric acid. The influences of the...

a sensitive and simple method for simultaneous preconcentration of trace heavy metal ions in some cerealand vegetable samples has been reported. the method is based on the adsorption of cu2+, fe3+, zn2+ and pb2+on 2-(2-nitro-phenylazo)-naphthalen-1-ol (npn) loaded on activated carbon (ac). the adsorbed metals onactivated carbon were eluted using 3 ml 4 mol l−1 nitric acid. the influences of the...

The title compound, C(23)H(24)N(2)O(3), was synthesized from naphthalen-2-ol, 3-nitro-benzaldehyde and 3-methyl-piperidine. The dihedral angles between the naphthalene system and the nitro-benzene and methyl-piperidine rings are 78.53 (13) and 64.14 (15)°, respectively. The mol-ecular conformation is stabilized by a strong intra-molecular O-H⋯N hydrogen bond.