The development of a method based on extraction induced by emulsion breaking (EIEB) aiming copper determination in gasohol using graphite furnace atomic absorption spectrometry (GF AAS) is reported. Emulsification the samples was carried out nitric acid solution, (1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol surfactant (Triton X-114), and ultrasound energy. variables related to efficienc...

The study of cigarette authenticity in Brazil is important due to increasing consumption contraband cigarettes. Nicotine concentration an parameter reflecting the quality tobacco used production these Simple methods for this determination, which produce reduced waste, are environmentally and industrially important. nicotine smuggled was determined by QuEChERS method, requiring some modification...

Mn3O4 were synthesized via the hydrothermal method at 200°C for 24 h, using surfactants. The resultant products examined by powder X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electronic microscope (TEM), UV-visible and BET surface area analysis. as-prepared materials used adsorption of methylene blue dye (MB). effect various experim...

The pH and substrate-to-inoculum ratio (S/I) are important parameters in the anaerobic fermentation of agroindustrial residues, therefore optimization these two is needed for a stable, efficient, sustainable reactor operation. In this work, (5–9) S/I (0.5–3 gVS gVS−1) were optimized to produce biobased volatile fatty acids (VFAs) from hydrothermally pretreated olive mill solid waste (HPOMSW). r...

A method was developed for determination of total antimony in hair samples from patients undergoing chemotherapy against Leishmaniasis based on the administration of pentavalent antimonial drugs. The method is based on microwave assisted digestion of the samples in a pressurized system, reduction of Sb5+ to Sb3+ with KI solution (10% w/v) in ascorbic acid (2%, w/v) and its subsequent determinat...

Lanhouin is a traditional fermented salted fish made from the spontaneous and uncontrolled fermentation of whole salted cassava fish (Pseudotolithus senegalensis) mainly produced in the coastal regions of West Africa. The combined effects of NaCl, citric acid concentration, and marination time on the physicochemical and microbiological characteristics of the fish fillet used for Lanhouin produc...