Production of 15N-enriched nitric acid (H15NO3)

Abstract

-Techniques that employ15 N have proved to be an important tool in many areas of the agronomic and biomedical sciences. Nevertheless, their use is limited by methodological difficulties and by the price of compounds in the international market. Nitric compounds ( 15 NO 3 -) have attracted the interest of researchers. However, these compounds are not currently produced in Brazil. Thus, in the present work H 15 NO 3 was obtained from the oxidation of anhydrous 15 NH 3 . The method we used differs from the industrial process in that the absorption tower is replaced with a polytetrafluoroethylene-lined, stainless-steel hydration reactor. The process output was evaluated based on the following parameters: reaction temperature; ratio of reagents; pressure and flow of 15 NH 3(g) through the catalyst (Pt/Rh). The results showed that, at the best conditions (500 ºC; 50 % excess O 2 ; 0.

Síntese e controle de qualidade da ureia enriquecida em 13C para diagnóstico da Helicobacterpylori (HP)

“…19 A disponibilidade de compostos enriquecidos nos isótopos estáveis ( 15 N, 34 S, entre outros), no país, impulsionou significativamente as pesquisas com o emprego de traçador não radioativo. [20][21][22][23] Ressalta-se, ainda, que os custos desses compostos têm se mostrado inferiores ao preço de comercialização internacional (FOB).…”