A selective and sensitive method for determination of nitroaromatics is described. The analytes were reduced to corresponding primary amines with iron powder and then derivatized with fluram in citrate buffer to form pyrrolinones. The highly fluorescent pyrrolinones were isolated and preconcentrated by octadecylsilane solid phase extraction cartridge followed by reversed-phase, high-performance liquid chromatographic analysis. Detection was at 395–495 nm. Various aspects such as the reduction process, derivatization, solid phase extraction and chromatographic separation were optimized. Analysis time was relatively short due to a special design for successive reduction and preconcentration. Limits of detection for 3-nitrophenol, nitrobenzene, 4 and 2-nitrotoluene were less than 60, 12, 60 and 280 ng L−1 respectively.

Liquid Chromatographic Determination of Nitroaromatics in Water following Solid Phase Extraction, Pre-column Reduction and Derivatization

Detection of nitrobenzene and related aromatics by reduction and indophenol formation

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Advanced spectroscopic techniques for the analysis of illicit drugs and explosives

The Raman spectra of Meisenheimer complexes derived from 1,3,5-trinitrobenzene and proline, tryptophan, albumin and pyrrolidine were obtained. The spectra excited in and out of resonance with the electronic transition at ca. 460 nm show an outstanding enhancement of modes involving mainly the symmetric stretching and deformation of the NO 2 groups. The results also indicate a marked reduction in the symmetric and asymmetric stretching frequencies, in addition to suggesting a decrease in symmetry on going from the parent nitro aromatic to the Meisenheimer complexes

Saeeduzzafar Qureshi

Papers

A Novel and sensitive spot-test for m-dinitroaromatics and their derivatives with sodium sulphite and dimethylsulphoxide.