1,721,285 research outputs found
Determination of metals in the Spirulina Platensis by instrumental neutron activation analysis
No full textin: Radiations: from theory to multidisciplinary applications, A. Salvadori (Ed.
Determination of organophosphorus pesticide residues in human tissues by capillary gas chromatography-negative chemical ionization mass spectrometry analysis
No full textIdentification of halocarbons in the Tiber and Marta rivers by static headspace and liquid-liquid extraction analysis
No full textUse of different anticoagulants for HPLC separation and quantification of the free amino acid content of plasma
No full textSimultaneous determination of cysteine, cysteine and 18 other amino acids in varius matrices by high-performance liquid chromatography
No full textDetermination of macrominerals and trace elements in the alga Spirulina Platensis
No full textThe alga Spirulina, in particular Spirulina platensis, an ubiquitous component of sea and ocean with high nutritional content, is considered a potential alimentary source for third world countries
affected by heavy famine problems. On other side, Spirulina-based products are nowadays commonly commercialized and recommended by suppliers as health food, diet pills, vitamins
supplement etc.. However, a careful nutritional and toxicological evaluation of these products is necessary, since algae show bioaccumulation properties towards heavy metals. In this frame,
samples of commercial and natural Spirulina platensis of Cuban origin, have been characterized for their macromineral and trace elements content. Measurements have been carried out by INAA
and ICP-AES employing standard reference materials. The use of two techniques allowed the determination of a wider spectrum of elements and in some cases, the cross-checking of the data
obtained. The toxic heavy metals levels found in both products are such that they do not constitute, on the basis of the recommended daily doses a health hazard for consumers
A method validation for simultaneous determination of phthalates and bisphenol A released from plastic water containers
Full text linkPhthalates (or phthalate esters, PAEs) and bisphenol A (BPA) are widely used in various industries, particularly in the fields of cosmetics and packaging, and they increase the malleability and workability of materials. As a result of their use, some international health organizations have begun to study them. In this study, the authors developed a methodology for the simultaneous determination of dimethyl phthalate (DMP), diethyl phthalate (DEP), diisobutyl phthalate (DiBP); dibutyl phthalate (DBP), bis(2-ethylhexyl) phthalate (DEHP); di-n-octyl-phthalate (DnOP) and bisphenol A (BPA) from drinking and non-potable waters. The extraction of PAEs and BPA was performed using a solvent-based dispersive liquid-liquid microextraction (SB-DLLME) method. The analytical determination was performed using a gas chromatography-ion trap mass spectrometry (GC-IT/MS) analysis. The entire procedure was validated as recoveries were studied according to the volume and the extraction solvent used, pH, and ionic strength. Dynamic linearity ranges and linear equations of all the compounds were experimentally determined as well as the limit of detection (LOD) (1-8 ng mL-1) and the limit of quantification (LOQ) (5-14 ng mL-1), reproducibility, and sensitivity. The method was applied to 15 water samples (mineral water and tap water) for determining PAEs and BPA released from the plastic container. After the release simulation, four PAEs (i.e., DiBP, DBP, DHEP, and DnOP) were determined at very low concentrations (below 1.2 ng mL-1) in two water samples from (sport) bottles
Indoor exposure to particles emitted by biomass-burning heating systems and evaluation of dose and lung cancer risk received by population
No full textHomes represent a critical microenvironment in terms of air quality due to the proximity to main particle sources and the lack of proper ventilation systems. Biomass-fed heating systems are still extensively used worldwide, then likely emitting a significant amount of particles in indoor environments. Nonetheless, research on biomass emissions are limited to their effects on outdoor air quality then not properly investigating the emission in indoor environments. To this purpose, the present paper aims to evaluate the exposure to different airborne particle metrics (including both sub- and super-micron particles) and attached carcinogenic compounds in dwellings where three different heating systems were used: open fireplaces, closed fireplaces and pellet stoves. Measurements in terms of particle number, lung-deposited surface area, and PM fraction concentrations were measured during the biomass combustion activities, moreover, PM10 samples were collected and chemically analyzed to obtain mass fractions of carcinogenic compounds attached onto particles. Airborne particle doses received by people exposed in such environments were evaluated as well as their excess lung cancer risk. Most probable surface area extra-doses received by people exposed to open fireplaces on hourly basis (56 mm(2) h(-1)) resulted one order of magnitude larger than those experienced for exposure to closed fireplaces and pellet stoves. Lifetime extra risk of Italian people exposed to the heating systems under investigation were larger than the acceptable lifetime risk (10(-5)): in particular, the risk due to the open fireplace (8.8 x 10(-3)) was non-negligible when compared to the overall lung cancer risk of typical Italian population. (C) 2017 Elsevier Ltd. All rights reserved
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