Download - Europe Direct Iasi

CLASS 3 EUROINVENT 2010 CLASA 3
3.23.
Title EN
conditions for each separation step: type, composition and
characteristics (concentration, pH, redox potential) of extractant
solutions, type and characteristics (concentration, pH) of phase-forming
salts, optimum concentration of polymer, mixing ratio of the phases and
contact time; (iii) stability limits of aqueous two-phase systems –
estimated towards to type and concentration of phase-forming salts, pH,
polymer concentration; (iv) the yield, selectivity and implementing
limits of the procedure – estimated as a function by type of extraction
system and by characteristics of soil samples.
Experimental installation for the study of speciation,
migration and inter-phases distribution processes of heavy
metals in soils
Authors Bulgariu Dumitru 1,4 , Bulgariu Laura 2 , Stoleru Vasile 3
Institution
Patent no.
Description
EN
1 „Al.I.Cuza” University of Iaşi, Faculty of Geography and Geology
2 University „Gheorghe Asachi” of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
3 „Ion Ionescu de la Brad” University of Iaşi,
4 Romanian Academy, Iaşi
Pending
The invention relates to the description of an experimental
installation for the study of the dynamics of speciation and interphases
distribution processes of heavy metals in soils, which can be
used for the estimation of risk potential of heavy metals in
agricultural soils, and of the impact of heavy metals on the
biological and mineral systems, respectively, from polluted soils.
The main component of the installation is a micro-reactor, with a
total volume of 1250 cm 3 and an optimum work volume of 800
cm 3 . The solid phases (soil samples) are placed on a support
consisting of a set of three sieves, made of Teflon and stainless
steel. Foe heating of the micro-reactor, can be attached an electrical
heating jacket provided with temperature regulator. The monitoring
of pH, redox potential and heavy metals concentration in soil
sample is done using adequate electrochemical sensors. The
installation has a special device for collection of solution samples
from micro-reactor (for detailed physic-chemical analysis) and the
control of work atmosphere (pressure and composition of gas
phase), and a device for phasing of solutions in micro-reactor. The
installation allows the experimental modelling in solid-liquid, solidliquid-gas,
liquid-gas multi-phases –multi-components systems, at
pressures of 0.5–1.75 atm., temperatures of 5–45 o C, and is easily
adaptable in relation to an appreciable number of physic-chemical
operational parameters.
56