Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce?with N,N,N′,N′ tetrabutylmalonamide (TB...Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce?with N,N,N′,N′ tetrabutylmalonamide (TBMA) in toluene from nitrate media has been investigated. The effect of the concentration of nitric acid, TBMA and salting out agent (LiNO3) and also the temperature on the distribution ratios was examined. The stoichiometries of the extracted complexes were determined to be Ce(NO3)3·3TBMA and Ce(NO3)3·4TBMA, respectively. The ap<IMG SRC="IMAGE/06170035.JPG" HEIGHT=11 WIDTH=24>parent extraction constants and the enthalpy of the extraction were calculated based on the extraction data, which are logKex1=3.97, logKex2=4.75 and =-31.25kJ·mol-1, respectively. The IR spectra of the loaded organic phase supported the suggested extraction mechanism.展开更多
目的评价冻干A+C群脑膜炎球菌多糖结合疫苗(Group A and Group C Meningococcal Polysaccharide Conjugate Vaccine,Freeze-dried;MPCV-Fd/A+C),在婴幼儿中大规模使用后的安全性。方法采用分层整群抽样,在安徽省5个市,对>10万名6～2...目的评价冻干A+C群脑膜炎球菌多糖结合疫苗(Group A and Group C Meningococcal Polysaccharide Conjugate Vaccine,Freeze-dried;MPCV-Fd/A+C),在婴幼儿中大规模使用后的安全性。方法采用分层整群抽样,在安徽省5个市,对>10万名6～23月龄婴幼儿接种2剂MPCV-Fd/A+C,2剂间隔1个月,每剂0.5毫升(ml),含A群、C群荚膜多糖各10微克(g)。接种后进行30min即时反应观察,以及24、48、72h的随访观察,接种后第7天如受试者未主动报告不良事件,将结束随访观察。按照统一的病例报告表(接种日记卡)对接种反应进行观察和记录。结果本次共接种MPCV-Fd/A+C并进行安全性观察100155人,第一剂接种3天内发热反应为2.57%,并逐天降低;全身反应的过敏、烦躁、嗜睡、厌食、呕吐、腹泻的发生率分别为0.04%、0.12%、0.05%、0.06%、0.05%和0.09%;局部反应的疼痛、发红、肿胀、皮下硬结的发生率分别为0.03%、0.05%、0.04%、0.02%。接种第二剂后,各种反应发生率较第一剂更低。接种MPCV-Fd/A+C后发生的各种反应>90%为轻度反应,未发生潜在的威胁生命的4级反应。结论 MPCV-Fd/A+C在婴幼儿中大规模使用后,全身和局部反应发生率低,反应轻微,安全性良好。展开更多
The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature o...The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature on the extraction have been studied. The composition of the extracted species was found to be Tm(NO3)3·3TBMA as characterized by IR spectrometry. The apparent equilibrium constant of extraction has been determined to be (0.61±0.18) L^6/mol^-6 at 298 K. Enthalpy of the extraction reaction is -27.61 kJ/mol.展开更多
文摘Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce?with N,N,N′,N′ tetrabutylmalonamide (TBMA) in toluene from nitrate media has been investigated. The effect of the concentration of nitric acid, TBMA and salting out agent (LiNO3) and also the temperature on the distribution ratios was examined. The stoichiometries of the extracted complexes were determined to be Ce(NO3)3·3TBMA and Ce(NO3)3·4TBMA, respectively. The ap<IMG SRC="IMAGE/06170035.JPG" HEIGHT=11 WIDTH=24>parent extraction constants and the enthalpy of the extraction were calculated based on the extraction data, which are logKex1=3.97, logKex2=4.75 and =-31.25kJ·mol-1, respectively. The IR spectra of the loaded organic phase supported the suggested extraction mechanism.
文摘目的评价冻干A+C群脑膜炎球菌多糖结合疫苗(Group A and Group C Meningococcal Polysaccharide Conjugate Vaccine,Freeze-dried;MPCV-Fd/A+C),在婴幼儿中大规模使用后的安全性。方法采用分层整群抽样,在安徽省5个市,对>10万名6～23月龄婴幼儿接种2剂MPCV-Fd/A+C,2剂间隔1个月,每剂0.5毫升(ml),含A群、C群荚膜多糖各10微克(g)。接种后进行30min即时反应观察,以及24、48、72h的随访观察,接种后第7天如受试者未主动报告不良事件,将结束随访观察。按照统一的病例报告表(接种日记卡)对接种反应进行观察和记录。结果本次共接种MPCV-Fd/A+C并进行安全性观察100155人,第一剂接种3天内发热反应为2.57%,并逐天降低;全身反应的过敏、烦躁、嗜睡、厌食、呕吐、腹泻的发生率分别为0.04%、0.12%、0.05%、0.06%、0.05%和0.09%;局部反应的疼痛、发红、肿胀、皮下硬结的发生率分别为0.03%、0.05%、0.04%、0.02%。接种第二剂后,各种反应发生率较第一剂更低。接种MPCV-Fd/A+C后发生的各种反应>90%为轻度反应,未发生潜在的威胁生命的4级反应。结论 MPCV-Fd/A+C在婴幼儿中大规模使用后,全身和局部反应发生率低,反应轻微,安全性良好。
文摘The behavior of N,N,N′,N′-tetrabutylmalonamide(TBMA) in extraction of Tm(Ⅲ) using toluene as diluent has been investigated. The effects of the concentrations of TBMA, nitric acid, lithium nitrate, and temperature on the extraction have been studied. The composition of the extracted species was found to be Tm(NO3)3·3TBMA as characterized by IR spectrometry. The apparent equilibrium constant of extraction has been determined to be (0.61±0.18) L^6/mol^-6 at 298 K. Enthalpy of the extraction reaction is -27.61 kJ/mol.
