Search results for "icp"

Protein aggregates for water purification

Water pollution is the contamination of water bodies including lakes, rivers, oceans and it is a leading global risk factor for illness and death for people, plants and living organisms. A principal source of water pollution is industry, from which increasing amounts of toxic pollutants are released including heavy metals such as cobalt, lead and copper. Today various technologies for purifying contaminated water can be applied, a lot of them being typically expensive, ion specific and characterised by low efficiency. For these reason, the search of new biocompatible materials with increased capabilities is strongly needed.Protein aggregates have already revealed their potential as environm…

Wireless power transfer system stability analysis for E-bikes application

2019

The present work reports the stability analysis of an Inductive Coupled Power Transfer (ICPT) System coupled to an electrical bike. The study has focused on two coupled coils with circular geometry and vertical disposition. In the first part of the work, the theoretical aspects related to the stability of wireless power systems are handled. In the second part, performing several simulations, varying the features of the considered configuration, the stability is looked for. In order to perform this process, the Ansys Maxwell software has been used, performing 3D simulations.

DETERMINATION OF YLOID IN SOIL AND GRAPEVINE SYSTEMS (Vitis vinifera L.) BY ICP-MS TECHNIQUE: A HOPEFUL PROXY FOR THE GEOGRAPHICAL CHARACTERIZATION O…

2012

In recent years identification of the geographical origin of food has acquired very importance because consumers are more and more interested in knowing the provenance of the food purchased and/or eaten. The knowledge of a chemistry relationship between the soil and the agricultural products is an important tool for the quality assessment of food. Metal cations onto particle surface of soil changing the environmental conditions can be mobilized and therefore to became bioavailable. In particular the chemical behavior of YLOID (Y, La and Lanthanoid) was studied to evaluate and trace the distribution from soil to roots, leaves to the grape in Vitis vinifera L. In a first study YLOID, present …

YREE determination in seawater. Standardization and validation of a new method based on preconcentration techniques

2010

The most interesting attraction of using rare-earth elements and yttrium (YREE) to address geochemical and marine chemical problems consists of their chemical coherence as group of trace elements. These characters allow YREE compositions of rocks and minerals to be extensively used in studies of provenance, petrogenesis and chemical evolution of the geological materials (1). Similarly, YREE compositions in the hydrosphere were used in studies of coagulation, particle-solution reactions and oceanic circulation of water masses (2-4). Unfortunately, very low concentrations of YREE (ng l-1 or sub-ng l-1) associated to high ionic strength of seawater always represented the main difficulty to ana…

Element variability in the coralline alga Lithophyllum yemenense as archive of past climate in the Gulf of Aden (NW Indian Ocean)

2017

This study presents the first algal thallus (skeleton) archive of Asian monsoon strength and Red Sea influence in the Gulf of Aden. Mg/Ca, Li/Ca, and Ba/Ca were measured in Lithophyllum yemenense from Balhaf (Gulf of Aden) using laser ablation inductively coupled plasma mass spectrometry, and Mg/Ca ratio oscillation was used to reconstruct the chronology (34 y). Oscillations of element rates corresponding to the algal growth between 1974 and 2008 were compared with recorded climate and oceanographic variability. During this period, sea surface temperatures (SST) in Balhaf recorded a warming trend of 0.55 degrees C, corresponding to an increase in Mg and Li content in the algal thallus of 2.…

Concepts, principes et outils de la méthodes Catalyse.

2005

Initially conceived in 1989, CATALYSE method of territorial intelligence is since 1994 the object of applications in about twenty regions of Europe. Its evolution is one research object of the European Network of Territorial Intelligence (ENTI/REIT). The communication exposes the fundamental concepts of the territorial intelligence. It clarifies the methodological - ethical and technological - principles which structure CATALYSE. It details tools proposed to the territorial actors of the sustainable development

Gaisa aerosolu frakciju skaita un sastāva analīze dzelzceļa apkārtnē

2018

Gaisa aerosolu frakciju skaita un sastāva analīze dzelzceļa apkārtnē. Bite I., vadītājs Dr. ķīm., doc. Osīte A. Bakalaura darbs, 31 lappuses, 10 attēli, 10 tabulas, 28 literatūras avoti, 2 pielikumi. Latviešu valodā. Literatūras apskatā veikts aerosolu klasifikācijas izvērtējums pēc to rašanās avotiem, kā arī raksturoti pētījumu rezultāti par dzelzceļa un metro staciju apkārtnē ievāktajiem aerosoliem un to ietekmi uz cilvēku organismu. Eksperimentālajā daļā veikta gaisa aerosolu frakciju PM10 un PM2.5, kā arī ultrasmalko aerosolu daļiņu masas un skaita koncentrāciju analīze dzelzceļa stacijas Torņakalns tuvumā. Paraugi ievākti, izmantojot aerosolu spektrometru, dihotomo impaktoru, mobilu ae…

Determinazione degli elementi in tracce negli alimenti per celiaci tramite ICP-MS

2014

Developing REE parameters for soil and sediment profile analysis to identify Neolithic anthropogenic signatures at Serpis Valley (Spain)

2020

In this study, patterns of rare earth elements (REE) have been developed and applied for the first time to sediments and soils to identify anthropogenic or natural layers in profiles sampled at several Neolithic settlements in the Serpis Valley area (Alicante, Spain). Most of these sites are characterized by dark brown paleosols that are easily distinguishable from the light brown paleosols of the valley. To demonstrate whether these strata are anthropogenic or natural requires a better geochemical understanding of sediment. Soil samples were taken across six different sites; four sites are associated with archaeological findings (sites BF, LP, PB and AC8); another one is from a natural sec…

Biotic methylation of mercury by intestinal and sulfate-reducing bacteria and their potential role in mercury accumulation in the tissue of the soil-…

2014

Abstract Monomethylmercury as one of the most toxic mercury species influences the health and development of higher organisms and tends to accumulate in the tissue of animals and humans. The aim of this study was to explore the mercury methylating capability of (1) intestinal microbiota of the soil-living earthworm Eisenia foetida (E. foetida) and (2) intestinal sulfate reducing-bacteria in pure cultures. After exposing animals to inorganic mercury chloride (4 mg kg−1 Hg2+) in soil and sterile soil for ten days, the amount of methylmercury in tissue was measured. Despite sterilization of soil, the accumulation of the organic mercury species in tissue was 51 ng g−1. To elucidate the potentia…