Radioisotopes and Analytical Chemistry

Abstract

<p align="justify"> <span><span style="font-family:Verdana;">When Periodic Chart of elements is consulted to find natural radioisotopes, one firstly finds tritium, followed by </span>^{<span style="font-family:Verdana;">10</span>}<span style="font-family:Verdana;">Be, </span>^{<span style="font-family:Verdana;">14</span>}<span style="font-family:Verdana;">C, </span>^{<span style="font-family:Verdana;">50</span>}<span style="font-family:Verdana;">V and many others. Before Bi, 12 cosmogenic radioisotopes are listed. They are those continuously produced by nuclear reactions among light elements present in earthly atmosphere and radiations coming from the outside space. Eighteen additional primordial radioisotopes are listed. They were created at the same time that the non-radioactive isotopes composing the 92 natural elements in the periodic table. From Bi on, every isotope is radioactive, up to U. Then follow the artificial elements produced by laboratory nuclear reactions from Np to element with atomic number 118. In this way, from 118 known elements, 64 are radioactive, which amount 55% of all those units forming the chemical compounds. Therefore, the complete understanding of radioactivity should be a suitable tool to advance our knowledge of Universe, and consequent applications to get better living conditions. So, this paper deals with radioisotopes as suitable instruments for chemical analysis.</span></span><span></span> </p> <p> <span></span> </p

Selective determination of selenium(IV) from environmental samples by UV-visible spectrophotometry usingO-methoxyphenyl thiourea as a chelating ligand

“…Different methods are available for determination of Se(IV) including neutron activation analysis [10], atomic absorption spectroscopy (AAS) [11], high performance liquid chromatography [12], capillary electrophoresis [13], stripping voltammetry [14] and catalytic kinetic spectrophotometry [15]. These methods have limitations, viz.…”