Immobilized Amino Aromatics for Solid-Phase Detection Using Imidazole-Mediated Bis(trichlorophenyl) Oxalate Chemiluminescence
摘要:
This investigation examines six amino polycyclic aromatic hydrocarbons, covalently immobilized onto nonporous and porous methacrylate, controlled-pore glass, and Merrifield (S-DVB) beads, for their suitability in solid phase peroxyoxalate chemiluminescence detection, The solid phase luminophores were packed in a now cell mounted adjacent to a photomultiplier tube, and the properties of the different reagents were evaluated by injecting aqueous hydrogen peroxide into a stream of premixed bis(trichlorophenyl) oxalate and imidazole in acetonitrile, The highest sensitivity was obtained with 3-aminoperylene and 3-aminofluoranthene, A high degree of functionalization as well as a large surface area of the support increased the efficiency, The porous methacrylate material was found to give better sensitivity and precision than a nonporous material of similar composition, In this respect, the porous methacrylate support was also superior to controlled-pore glass, although these materials gave similar detection limits. The microporous S-DVB copolymer with the same overall degree of functionalization as the porous methacrylate support showed a lower sensitivity, since its subsurface functionalization did not contribute to the efficiency.