Determination of nitrobenzenes and nitrochlorobenzenes in water samples using dispersive liquid-liquid microextraction and gas chromatography-mass spectrometry

Abstract

A rapid and sensitive method was developed for the determination of eight nitrobenzenes and four nitrochlorobenzenes in water. The method is based on dispersive liquid-liquid microextraction (DLLME) followed by gas chromatography-mass spectrometry (GC-MS). The key factors influencing the extraction efficiencies, including the nature and volume of the extraction and dispersion solvent and the ratios of the extraction solvent and dispersion solvent were examined and optimized. Under the optimized conditions, the method yields a linear correlation at a concentration range of 0.5 mg L À1 -500.0 mg L À1 for all the target analytes with correlation coefficients (R 2 ) of 0.9915 to 1.0000, and relative standard deviations (RSD, n ¼ 6) of between 4.9% and 8.2%, depending on the compound analysed. In addition, good pre-concentration factors of 243 to 525 for each specific compound were achieved. These results suggest that the method presented herein is a rapid and powerful microextraction technique that is useful for the detection of these organic pollutants in water samples and is suitable for emergency monitoring.

Electrocatalytic reduction of trace nitrobenzene using a graphene-oxide@polymerized-manganese-porphyrin composite

“…Nitrobenzene compounds are important chemical raw materials and have been widely used in medicine, pesticides, industrial dyes, and chemical production. [1][2][3][4] Because of their own toxicity and hardto-degrade nature, nitrobenzene compounds have caused great harm to organisms and the environment. Nitrobenzene compounds are also widely used in the military eld.…”

A novel permeable reactive biobarrier for ortho-nitrochlorobenzene pollution control in groundwater: Experimental evaluation and kinetic modelling

“…The compound ortho-nitrochlorobenzene (o-NCB) is a known human carcinogen, and is also associated with splenomegaly and cardiovascular diseases (Xu et al, 2014;Zhang et al, 2011). Even so, this chemical is widely used in industrial water systems to prevent the formation of slime.…”

EFFECT OF pH ON THE DETECTION OF EXPLOSIVE IN AQUEOUS SOLUTION USING A HYPERBRANCHED POLYTRIAZOLE WITH AGGREGATION-INDUCED EMISSION CHARACTERISTICS

“…1,2 Currently, a range of techniques have been developed for the purpose of explosive detection, 3,4 such as°uorescence quenching assays, 5À7 cyclic voltammetry, 8,9 gas chromatography coupled with a mass spectrometer, 10,11 surfaceenhanced Raman spectroscopy. 12,13 Among these analytical methods,°uorescent chemosensors have drawn growing attention due to their remarkable advantages of high sensitivity, speci¯city, and realtime monitoring with fast response, etc.…”