6 documents found, page 1 of 1
Uso da terra e atributos de solos do estado do Rio Grande do Sul
Nascimento,Paulo C. do; Bissani,Carlos A.; Levien,Renato; Losekann,Marno E.; Finato,TatianaA região da Encosta Inferior do Nordeste, no estado do Rio Grande do Sul, apresenta, na atividade agrícola, variações no tipo de uso do solo e sistemas de produção podendo levar à diferenciação nos atributos do solo e a processos de degradação. Com o objetivo de avaliar a granulometria e os atributos químicos do solo e compará-los em diferentes tipos de uso e manejo 78 glebas foram amostradas com oito diferente...
Voltametria de micropartículas imobilizadas: fundamentos e aplicações analíticas
Carvalho,Leandro M. de; Hilgemann,Maurício; Spengler,Cristiane; Nascimento,Paulo C. do; Bohrer,DeniseThe theoretical aspects of Voltammetry of Immobilized Microparticles (VIM) were discussed. The immobilization of microparticles on electrode surface, the electrode cleaning processes and the electrode materials were analyzed. The three-phase electrode model and the possible reactions between the immobilized particle and the electrolytic solution were discussed. In addition, this work discusses some selected app...
Determination of metallic contaminants in human recombinant erythropoietin (EPO...
Carvalho,Leandro M. de; Garmatz,Júlia C.; Spengler,Cristiane; Nascimento,Paulo C. do; Bohrer,Denise; Canabarro,Cibele M.; Garcia,Solange C.The contamination of renal failure patients by metals can be associated to the presence of toxic metals in the medication, since they can be absorbed by the organism. Among the possible contaminants, there are nephrotoxic metals such as aluminum, chromium and nickel. In the present work, the presence of Al, Cr and Ni as contaminants in erythropoietin formulations (EPO) was investigated by optimizing the adsorpt...
Determinação simultânea de cátions empregando eletroforese capilar com detecção...
Carvalho,Leandro M. de; Spengler,Cristiane; Lima,Ana Paula S. de; Raabe,Alice; Martini,Mariele; Nascimento,Paulo C. do; Bohrer,DeniseThis work describes the development of a home-made capillary electrophoresis (CE) system based on the capacitively coupled contactless conductivity detection (C4D) for the separation of the metallic species Zn2+, Cr3+, Pb2+, Cd2+, Co2+, Cu2+, Ni2+ e Tl+. A background electrolyte composed of MES/Histidine 0,02 mol L-1 (pH 5.0) was optimized for the separation of the metallic species by using organic solvents and...
Determinação voltamétrica de metais em águas e fluidos biológicos empregando mi...
Carvalho,Leandro M. de; Spengler,Cristiane; Garmatz,Júlia C.; Nascimento,Paulo C. do; Bohrer,Denise; Del-Fabro,Luciana; Radis,GuilhermeThis work describes the optimization of pretreatment steps for the destruction of organic matter in samples of waters and biological fluids, by using an UV irradiation system with a high power UV radiation source (400 W). The efficiency of the system constructed for the photo-decomposition of samples of model waters, natural waters and biological fluids was investigated by performing recovery experiments of the...
Voltammetric behavior of amfepramone (diethylpropion) at the hanging mercury dr...
Carvalho,Leandro M. de; Nascimento,Paulo C. do; Bohrer,Denise; Correia,Daniele; Bairros,André V. de; Pomblum,Valdeci J.; Pomblum,Solange G.This paper describes a systematic study of the voltammetric behavior of amfepramone at the hanging mercury drop electrode (HMDE) by cyclic (CV) and alternating current (AC) voltammetric methods. The studies showed the adsorptive behavior of amfepramone at the HMDE and were performed in H2SO4 0.1 mol L-1 (pH 1.0) and Ringer buffer (pH 11.0) as supporting electrolytes. The linear range for the amfepramone determi...