Naphthenic acids (NAs) or naphthenic acid fraction compounds (NAFCs) are generally recognized as a family of cycloaliphatic carboxylic acids naturally occurring in petroleum. These acid extractable organics (AEOs) from petroleum industry activities including oil sands produced waters (OSPW) have...

Previous studies that have investigated marine oil pollution have predominantly focused on petroleum hydrocarbons. Naphthenic acids (NAs), in contrast, are toxins that are less well studied. Following the Dalian oil spill accident, monitoring surveys were carried out to investigate NAs in Dalian...

Organic peroxides, t-butyl hydroperoxide, 2-butanone peroxide, cumene hydroperoxide and t-butyl peracetate, were determined by an amperometric enzyme electrode. The enzyme electrode was prepared through electrostatic immobilization of horseradish peroxidase (HRP) in a polyvinylferrocenium (PVF) ...

Organic peroxides are unstable chemicals which can easily decompose and may lead to explosion. Such a process can be characterized by physico-chemical parameters such as heat and temperature of decomposition, whose determination is crucial to manage related hazards. These thermal stability prope...

The preparation of a peroxidase biosensor by immobilization of the enzyme during the electropolymerization of N-methylpyrrole and its use in the determination of organic peroxides in a predominantly nonaqueous medium, such as reversed micelles, is reported. Reversed micelles were formed with eth...

W-containing mesocellular silica foams (MCF) having a Si/W (molar) ratio of 10–40 were synthesized and characterized by means of N2 adsorption, SAXS, XRD, TEM, DRIFTS, DR UV–vis and Raman spectroscopy. The results show that tungsten was well incorporated inside the MCF material and the nature ...

The α-aminoketone 1,4-diamino-2-butanone (DAB), a putrescine analogue, is highly toxic to various microorganisms, including Trypanosoma cruzi. However, little is known about the molecular mechanisms underlying DAB's cytotoxic properties. We report here that DAB (pKa 7.5 and 9.5) undergoes ...

1-Chloro-2-hydroxy-3-butene (CHB) is a possible metabolite of 1,3-butadiene, a carcinogenic air pollutant. To demonstrate its formation in vivo, it is desirable to develop a practical biomarker and the corresponding analysis method. CHB can undergo alcohol dehydrogenase- and cytochromes P450 enz...

The dehydrodimerization of 2-butanone or 3-pentanone by lead dioxide leads to 3,4-dimethyl-2,5-hexanedione or 4,5-dimethyl-3,6-octanedione in nearly quantitative yield. This very clean and efficient reaction has been studied from mechanistic and stereochemical points of view. Dehydrodimerization...

SummaryThe use of hand rub to obtain maximum decrease in bacterial load is important because the reduction needed to avoid transmission is unknown. The monomer of 2-butanone peroxide is a peroxygen derivative with potential biocidal use in hospitals. The aim of this study was to compare the effi...

SummaryThe monomer of 2-butanone peroxide is a novel peroxygen derivative with potential use as biocide in the hospital environment. The aim of this study was to test the biocidal activity of different concentrations of the compound against American Tissue Culture Collection strains from 11 diff...

This report describes the preparation and characterization of nano iron oxide impregnated alkyd coating (NIAC) displaying excellent anticorrosive ability. Fe2O3 nanoparticles prepared via gel combustion method were used as pigments and dispersed in alkyd resin using high-energy ball milling meth...

There is often ambiguity concerning the antiwear mechanisms of soluble lubricant additives used in bearings. For example, the common spacecraft lubricant additive lead naphthenate is thought to be effective only as long as a measurable concentration is present in the oil lubricant throughout the...

We present the selective ionization of acidic components of crude oils and naphthenates by negative-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). We further characterize isolated naphthenic acids from a calcium napthenate deposit by ne...

Iron chloride and iron naphthenate have been used as model contaminants to simulate the deleterious effects of this metal on commercial FCCs. The study of catalysts contaminated with different iron sources shows that the iron content alone cannot account for the metal effects. Its distribution o...

The main compounds responsible for acidity in crude oils are naphthenic acids, though other heteroatomic species are also acidic, particularly sulfur-containing compounds. Total acid number (TAN) measured in mg KOH/g-sample is the most used unit of acidity. A TAN threshold of 0.5 mg KOH/g has be...

The efficiency of two natural naphthenate surfactants (Naphthenic-dimethylamine and Naphthenic-diethylamine complexes), as corrosion inhibitors for mild steel in CO2-saturated 1% NaCl solution, has been determined by linear polarization resistance corrosion rate and potentiodynamic polarization ...

The oil-soluble iron-nickel bimetallic catalyst precursor was synthesized for the application of coal/oil co-processing. The catalyst precursor and its sulfurized product were characterized by FTIR, TG, XRD, and TEM. And the catalytic performance of this catalyst precursor in the coal/oil co-pro...

Amino-functionalized silica-coated iron oxide (Fe3O4/SiO2 NH2/C18) magnetic nanoparticles were synthesized, and amino-surface modification was performed with a high-pressure autoclave experiment and newly developed reflux procedure. The nanoparticles were tested for their ability to remove napht...

The study of toluene emulsions is relevant to understand the behavior, and the separation of solvent-diluted bitumen emulsions. Previous studies of similar systems have revealed that the presence of naphthenates, particles – specifically kaolinite- and asphaltenes can play an important role in ...