The aim of this work is to detect electrogenerated hydroxyl radicals and chlorine by simple and less expensive methods. Preparative electrolyses of perchloric acid (HClO4) and sodium chloride (NaCl) were performed on ...The aim of this work is to detect electrogenerated hydroxyl radicals and chlorine by simple and less expensive methods. Preparative electrolyses of perchloric acid (HClO4) and sodium chloride (NaCl) were performed on a boron-doped diamond (BDD) electrode. The hydroxyl radicals were quantified indirectly by assaying the samples from the HClO4 (0.1 M) electrolysis with a 10−4 M potassium permanganate solution. The investigations showed that the amount of hydroxyl radicals depends on the concentration of HClO4 and the current density. As for chlorine, a qualitative determination was carried out. A mixture of the electrolyte solution of HClO4 (0.1 M) + NaI (0.2 M) + 2 mL of hexane, taken in this order, leads to a purplish-pink coloration attesting to the presence of Cl2. The same test was carried out with NaBr and NaI giving pale and very pale pink colourations, respectively, showing that the intensity of the colouration depends on the strength of the oxidant present. In addition, oxidants were detected during the electrooxidation of metronidazole (MNZ). The results showed the participation of electrogenerated hydroxyl radicals. The generation of chlorine has also been proven. Furthermore, the degradation leads to a chemical oxygen demand (COD) removal rate of 83.48% and the process is diffusion-controlled.展开更多
Introduction: A fracture is a solution in the continuity of a bone. Pelvic limb fractures may involve one or more of the bones. They constitute a real public health problem, which requires the identification of the fa...Introduction: A fracture is a solution in the continuity of a bone. Pelvic limb fractures may involve one or more of the bones. They constitute a real public health problem, which requires the identification of the factors inherent to this phenomenon for better prevention, but also for quality management of fractures and sequelae. Objectives: Were to describe the epidemiological, clinical and therapeutic profile of pelvic limb fractures in Timbuktu Hospital. Patients and Method: We conducted a prospective, descriptive study in the Surgery Department of Timbuktu Hospital, covering a period of one year from January 1 to December 31, 2017. We collected 39 patients who presented with fractures of the pelvic limbs, who were hospitalized and monitored throughout our study. Results: We obtained a hospital frequency of 2.86% limb fractures. Among the 39 patients included in our study, the male sex was predominant in 69.2% of cases, the average age of our patients was 20.5 years. Pupils and students were in the majority in 48.7% of cases. Road traffic accidents were the most common cause of fracture with 59.0% of cases. The tibia was the most affected segment in 38.5% of cases. Surgical treatment was predominant in 64.0% of cases. We obtained very good results in 94.87% of cases. Conclusion: Limb fractures remain frequent due to road traffic accidents. Osteosynthesis treatment provides a good result with fewer complications.展开更多
文摘The aim of this work is to detect electrogenerated hydroxyl radicals and chlorine by simple and less expensive methods. Preparative electrolyses of perchloric acid (HClO4) and sodium chloride (NaCl) were performed on a boron-doped diamond (BDD) electrode. The hydroxyl radicals were quantified indirectly by assaying the samples from the HClO4 (0.1 M) electrolysis with a 10−4 M potassium permanganate solution. The investigations showed that the amount of hydroxyl radicals depends on the concentration of HClO4 and the current density. As for chlorine, a qualitative determination was carried out. A mixture of the electrolyte solution of HClO4 (0.1 M) + NaI (0.2 M) + 2 mL of hexane, taken in this order, leads to a purplish-pink coloration attesting to the presence of Cl2. The same test was carried out with NaBr and NaI giving pale and very pale pink colourations, respectively, showing that the intensity of the colouration depends on the strength of the oxidant present. In addition, oxidants were detected during the electrooxidation of metronidazole (MNZ). The results showed the participation of electrogenerated hydroxyl radicals. The generation of chlorine has also been proven. Furthermore, the degradation leads to a chemical oxygen demand (COD) removal rate of 83.48% and the process is diffusion-controlled.
文摘Introduction: A fracture is a solution in the continuity of a bone. Pelvic limb fractures may involve one or more of the bones. They constitute a real public health problem, which requires the identification of the factors inherent to this phenomenon for better prevention, but also for quality management of fractures and sequelae. Objectives: Were to describe the epidemiological, clinical and therapeutic profile of pelvic limb fractures in Timbuktu Hospital. Patients and Method: We conducted a prospective, descriptive study in the Surgery Department of Timbuktu Hospital, covering a period of one year from January 1 to December 31, 2017. We collected 39 patients who presented with fractures of the pelvic limbs, who were hospitalized and monitored throughout our study. Results: We obtained a hospital frequency of 2.86% limb fractures. Among the 39 patients included in our study, the male sex was predominant in 69.2% of cases, the average age of our patients was 20.5 years. Pupils and students were in the majority in 48.7% of cases. Road traffic accidents were the most common cause of fracture with 59.0% of cases. The tibia was the most affected segment in 38.5% of cases. Surgical treatment was predominant in 64.0% of cases. We obtained very good results in 94.87% of cases. Conclusion: Limb fractures remain frequent due to road traffic accidents. Osteosynthesis treatment provides a good result with fewer complications.
