The use of nanomaterials, such as nanoparticles and nanotubes, for electrochemical detection of metal species has been investigated as a way of modifying electrodes by electrochemical stripping analysis. The present study develops a new methodology based on a comparative study of nanoparticles and nanotubes with differential pulse anodic stripping voltammetry (DPASV) and examines the simultaneous determination of copper and lead. The glassy carbon electrode modified by gold nanoparticles demonstrated increased sensitivity and decreased detection limits, among other improvements in analytical performance data. Under optimized conditions (deposition potential −0.8 V versus Ag/AgCl; deposition time, 300 s; resting time, 10 s; pulse amplitude, 50 mV; and voltage step height, 4 mV), the detection limits were 0.2279 and 0.3321 ppb, respectively, for determination of Pb2+ and Cu2+. The effects of cations and anions on the simultaneous determination of metal ions do not exhibit significant interference, thereby demonstrating the selectivity of the electrode for simultaneous determination of Pb2+ and Cu2+. The same method was also used to determine Cu2+ in water samples.
O estudo objetiva avaliar a importância do sono na saúde do adolescente. Trata-se de uma revisão integrativa da literatura realizada através das bases de dados Scientific Electronic Library Online (SciELO), Literatura Latino-Americana e do Caribe em Ciências da Saúde (LILACS) e Medical Literature Analysis and Retrieval System Online (MEDLINE), através dos seguintes Descritores em Ciências da Saúde (DeCS): “sono”, “saúde do adolescente” e “adolescente”. Combinados entre si pelo operador booleano AND. Como critérios de inclusão: artigos disponíveis na íntegra, nos idiomas português, espanhol e inglês, que abordassem a temática, nos últimos cinco anos (2017-2022). Como critérios de exclusão: artigos que não contemplavam o tema e estudos repetidos nas bases de dados. Foram encontrados 68 artigos, após a busca combinada de descritores e operadores booleanos foram selecionados 10 artigos para compor a amostra final. Conclui-se, de todo o percurso com o projeto atual, que essas modificações estudadas e deliberadas promovem maior aptidão do sono tanto para os jovens envolvidos no movimento quanto para cada pessoa que tira proveito de todos os ajustes nos hábitos noturnos que foram propostos.
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