26-27 NOI TIPURI DE STICLE CA POTENŢIALI SENZORI PENTRU DETERMINAREA NITRAŢILOR DIN APĂ


NEW TYPES OF GLASS AS POTENTIAL SENSORS TO
DETERMINE THE NITRATES ANIONS
FROM WATER
In this paper is presented a new type of glass that can be used as
potential electrochemical sensor for nitrate anions from aqueous solutions. The
glass sample obtained was analysed by FT-IR and UV-VIS spectroscopy and
cyclic voltammetry (VC). The cyclic voltammetry shows that the current
increase with the increasing of concentration of sodium nitrate from aqueous
solutions. The FT-IR spectrum after VC shows a decreasing of [PbO6] structural
units from the glass, probably increasing in this way the number of free lead
ions (Pb+2) and improving the electrochemical properties of the glass sample.
The decrease in the intensity of the UV-VIS absorption bands after VC shows
that a part of Fe+3 ions convert to Fe+2 ions and pass into solution.
Keywords: glass, sensors, IR spectroscopy, cyclic Anodic, UV-VIS
spectroscopy, nitrates in water
Cuvinte cheie: sticlă, senzori, voltametrie ciclică, spectroscopie IR,
spectroscopie UV-VIS, nitraţi din ape
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