With the development of new materials and recent requirements green chemistry, digestion remains a challenging step in many analytical procedures.

Water removal is an essential step during crude oil production due to several problems such as increased transportation costs and high corrosion rate dissolved salts. Indirect low frequency ultrasonic energy (US), using baths, has been recently proposed effective alternative for demulsification. However, the reactor position sonication its influence on demulsification efficiency not evaluated. In this sense, aim of study was develop automated system based open source hardware mapping...

A method for digestion of soils with high inorganic matter content (ranging from 50 to 92%) by microwave-induced combustion (MIC) is proposed the first time further halogens (F, Cl, Br, and I) determination ion chromatography (IC) also inductively coupled plasma mass spectrometry (ICP-MS). Microcrystalline cellulose (100-500 mg), used as a aid, was mixed sample water or NH4OH solutions (10-100 mmol L-1) were investigated analytes absorption. The use (400 mg) mandatory volatilize matter. It...

Determination of rare earth elements in graphite samples was performed by direct solid sampling electrothermal vaporization-inductively coupled plasma mass spectrometry (ETV-ICP-MS).

The present work studies the incorporation of waste glass in ceramic paver, containing clay, one plentiful raw material earth's crust. Ceramic paver has a huge capacity use and, consequently too, recycling glass. A more sustainable process is presented here, since there which give energy efficiency during firing, because fluxing protagonism Formulations using clay up to 60% by weight were evaluated. pressing method used produce pavers for its firing temperatures between 900 and 1000 ​°C. As...

A homemade pyrohydrolysis system was developed with modifications of the reactor and condenser for analysis cardboard gaskets to determine fluorine, chlorine, bromine, iodine. special device constructed introducing sample boat into reactor. considerable reduction time required preparation achieved these modifications. The conditions were optimized include a temperature 1000°C, reaction 7.5 min, 300 mg, water flow 1.0 mL/min, gas rate 0.2 L/min. It observed that accelerator absorbing solution...

A novel system for sample digestion was proposed based on microwave-induced combustion in disposable vessels (MIC-DV) trace elements determination by inductively coupled plasma optical emission spectrometry (ICP-OES). As a proof of concept, botanical samples were digested MIC-DV further Al, Cr, Cu, Fe, Mn, Sr, and Zn. The consists quartz holder (a modified version conventional MIC) placed inside polypropylene (PP) vessels. carefully designed to avoid excessive heating damaging the vessel...

In this work, a continuous flow extraction system assisted by ultrasound (US) was developed for the of Cr(III) from residual tanned leather shavings. US energy delivered into tubular applicator (clamp-on tube applicator). The effect investigated at 20 kHz frequency and electrical input power 75, 150, 300 600 W. Residence time temperature profile were also evaluated. It observed that internal affected presence inverted in comparison with conditions without US. way, generated reproduced using...

An alternative method for the determination of total chlorine content in hydroxypropyl cellulose (HPC) was applied, combining a recently developed system based on combustion step followed by pyrohydrolysis reaction. Using this approach it inductively coupled plasma optical emission spectrometry (ICP-OES) without interferences feasible. It overcame limitations European Pharmacopoeia (EP) HPC analysis regarding to inability determine HPC, once some compounds (e.g., chloroform) that can not be...

In this work, a new portable device based on monomode microwave applicator was developed and applied for microwave-assisted solid sampling analysis coupled to flame furnace atomic absorption spectrometry (MW-SS-FF-AAS). As an example of application, Hg determined in polymer samples order demonstrate the feasibility proposed system. Polymeric were weighed directly quartz boat, containing microcrystalline cellulose pellet wetted with 6 mol L−1 NH4NO3 solution, which introduced into system...

Abstract A protocol for blood sampling, storage and digestion subsequent determination of Br, Cl I by inductively coupled plasma mass spectrometry (ICP-MS) was proposed. The sampling performed a known as dried spot (DBS). Their characteristics make it perfect couple with microwave-induced combustion in disposable vessels (MIC-DV) trace elements determination. Strategies controlling the volume or collected DBS paper were evaluated. Operational conditions MIC-DV such time vessel purging O2,...

A single reaction chamber microwave-assisted wet digestion system using O 2 as an auxiliary reagent and diluted HNO 3 for multisample metal determination.

Oxygen solid-state outdiffusion from the substrate to epitaxial layer was investigated by using micro-Fourier transform infrared measurements in a transversal wafer cross-section configuration. Interstitial oxygen concentration, obtained analyzing 1107 cm−1absorption band, indicated that an content, clearly detectable technique, is present near interface. To our knowledge this first evidence of into layer.

Microwave-assisted solid sampling analysis coupled to flame furnace atomic absorption spectrometry (MW-SS-FF-AAS) was used for Cd and Pb determination in food-contact polymer samples, with the aim of minimizing reagents laboratory waste. Operational parameters, such as FF tube design, oxygen flow rate, stoichiometry, sample mass, among others, were evaluated optimized. Calibration performed using only reference solutions, limits quantification 1.7 4.6 μg g−1 Pb, respectively. Accuracy...

The consumption of microplastics can have harmful effects. To effectively remove from water using an affordable device, this study developed a ceramic filter based on clay and waste glass. research evaluated the addition porogenic agent effects firing temperature. In formulations, was substituted by with 10 20 weight, maintaining weight Ceramic filters were produced molding press, for their physical properties. Its performance assessed permeability at different pressures, leaching elements,...

The oxygen content near epitaxial layer-substrate silicon interface was investigated using a micro Fourier transform infrared technique. Systematic measurements, performed in transversal wafer cross-section configuration, clearly indicated the presence of interstitial layer when it grown on n-type substrates, while no evidence obtained (in concentration detectable by technique) p-type substrates. Interstitial profiles, interface, analyzing optical data, are reported and discussed considering...