Nitrophenolic Compounds

Nitrophenolic compounds were analyzed by GC-MS-SIM, after trimethylsilylation by the flash heater derivatization procedure, which is suitable for nitrophenols not easily derivatized by the conventional methods. The method is suitable for identification of complex mixtures and for quantitative analysis in the nanogram range510. 

On diluting the methyl alcoholic filtrate with water, 10-20 cc. of oil separates more of this oil is formed by nitrating at higher temperatures, amounting to 57 cc. at 50° and 100 cc. at 70°. The oil consists not merely of methyl o-nitrobenzoate with some of the meta compound but contains also traces of dinitrobenzoic ester and nitrophenolic compounds. Unchanged methyl benzoate does not appear to be present. 

A comparison of sensitized and direct photocatalysis was performed for the degradation of 4-nitrophenol (Dieckmann and Gray, 1996). The application of sensitization to the degradation of nitrophenolic compounds and azo... 

Dinoseb is a nitrophenolic compound, once widely used as an herbicide and plant desiccant, that is noted for its toxic effects. The chemical name of this compound is 4,6-dinitro-2-,v< o butylphenol, and its structure is... 

Ni F, Thomas L, Cotton TM. 1989. Surface-enhanced resonance Raman spectroscopy as an ancillary high-performance liquid chromatography detector for nitrophenol compounds. Anal Chem 61 888-894. 

Dieckmann, M.S. Gray, K. A. Kamat, P. V. Photocatalyzed degradation of adsorbed nitrophenolic compounds on semiconductor surfaces, Wat. Sci. Tech. 1992,25,277. 

Luan, J., Plaisier, A. (2004). Study on treatment of wastewater containing nitrophenol compounds by hquid membrane process (Short Communication). Jawma/ of Membrane Science 229 235-239. 

The susceptibility to hydrolysis of derivatives of nitrophenolic compounds (Hynning et al. 1989) ... 

The proposed method for the quantification of phenolic compounds includes mainly two deconvolution steps (Fig. 20). The first step is carried out for a spectral window range of 360 nm and 500 nm and allows the quantification of nitrophenol compounds (C1). Then the second deconvolution is performed on the residual spectrum for a spectral window range of 250 nm and 360 nm and leads to estimating the concentration of the other phenolic compounds (C2). 

Fan et al. [150] studied the selective analysis of 4-nitrophenol (4-NP) from water samples using online SPE coupled to HPLC system. They have utilized the (3-cyclodextrin-bonded silica (CDS) as the selective sorbent for 4-nitrophenol compound. Using 100 mL of sample solution spiked with 4-NP and six other phenols (Ph) in double-distilled water, they have shown that the sorbent has a strong capacity in adsorbing 4-NP and the recovery was 104% with the detection limit of 0.017 xg/L. Figure 16.2 and Figure 16.3 show chromatograms obtained from online SPE-HPLC systems [150]. 

---