Benzene In Study Research Articles

0238 Lung cancer and exposure to benzene, toluene and xylene: results from two case-control studies in Montreal

ObjectivesWe aimed to evaluate the risks of lung cancer associated with exposure to benzene, to toluene and to xylene.MethodTwo population-based case-control studies conducted in Montreal included 1896 lung cancer cases...

Photoluminescent Characteristics of ZnS Quantum Dots Synthesized in Non-Aqueous-Phase

ZnS quantum dots (ZnS QDs) synthesized in aqueous solution is easy to gather a mass, which always results in low quantum yield. So, in this study benzene was used as reaction medium in which ZnS QDs with different hues were synthesized, and the hues of ZnS QDs were depend on the molar ratio of Zn (CH3COO)2 and Na2S·9H2O. The results show the emission spectra of ZnS QDs shifts with the change of the precursor molar ratio but the absorption peak at 310nm is not. The emission peaks centered at 430nm and 580nm at higher molar ratio [Zn2+]/[S2-] with blue-violet emitting phosphors; but, ZnS QDs synthesized at higher molar ratio [S2-]/[Zn2+] have orange-red emission at 580nm only. The X-ray diffraction analysis shows the crystallinity of ZnS QDs is better at [Zn2+]/[S2-]=1:10, which are typical zinc blend with nanorod structure.

Anaerobic biodegradation of benzene in salt marsh sediment of the Louisiana Gulf coast

The 2010 BP oil spill became the worst environmental disaster in US history with unprecedented damages to the environment and human health. Ecosystem recovery from the oil spill largely depends on the microbial degradation of oil contaminants. In this study benzene was selected as a representative of petroleum hydrocarbons to assess its anaerobic biodegradation potential in salt marsh sediment from the Louisiana Gulf coast. The experiment was conducted in two separate phases of incubation of the sediment slurries to determine the benzene biodegradation kinetics (phase-1), and to determine if any stimulation of benzene degradation occurred after benzene exposure (phase-2). Benzene biodegradation was assumed to follow Michaelis–Menten kinetics, and the Vmax was determined to be 1.66mgg−1 week−1 and the Km to be 1.17mgg−1. According to this model, it would take 11 weeks for 1m2 of the salt marsh to degrade 1L of benzene. Benzene degradation rates were found to have a minimum increase after the sediment had been exposed to benzene for 4 weeks, which suggests that the sediment has almost reached its natural maximum biodegradation potential.

Retrospective estimation of exposure to benzene in a leukaemia case-control study of petroleum marketing and distribution workers in the United Kingdom.

OBJECTIVE: To provide quantitative estimates of exposure to benzene for cases and controls in an epidemiology study to investigate the risk of leukaemia in petroleum distribution workers. METHODS: Work histories...