应用季胺盐萃取铀(Ⅵ)-偶氮胂Ⅲ络合物的分光光度法测定铀

铀(Ⅵ)偶氮胂Ⅲ络合物溶液是在十二烷基辛基甲基苄基氨化铵存在条件下,用氯仿、甲苯、1,2-二氯代乙烷及丁醇等萃取。用氯仿萃取的络合物组成为1:1,最大吸收处的波长为655mμ,克分子消光系数为5.6×10~4。应用上述萃取法的条件:pH0.8—1.2,偶氮胂Ⅲ浓度为1.50×10~(-4)M,萃取剂为5%的十二烷基辛基甲基苄基氯化铵的氯仿溶液。铀(Ⅵ)在有机相的浓度为0.2—1.2×10~(-5)M时,符合比耳定律。 Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)、Mn(Ⅱ)、Cd(Ⅱ)、Al(Ⅲ)、Cr(Ⅲ)、Fe(Ⅲ)、Zr(Ⅳ)、V(Ⅴ)、W(Ⅵ)等离子存在时,影响很小。Th(Ⅳ)对U(Ⅵ)的萃取有影响。但本萃取法的灵敏度比萨文利用二苯胍盐的丁醇萃取法大约提高了一倍。     

塘口湾水库利用井中透视资料进行堵漏的效果分析

分析塘口湾水库无线电波透视资料 ,对该水库岩溶洞穴堵漏的水平、垂直位置进行设计 ,采用灌浆、混凝土、水墙等有效措施堵漏 ,处理效果良好。     

用于检查锅炉屏式过热器和再热器的机器人

前言在现有锅炉逐年恶化的过程中,为了维持设备的可靠性和性能,对锅炉的维护管理工作提出了更高的要求。故此,在进行维修工作时为了评价残余寿命,必须对设备进行精密的检查。而熟练操作人员的减少和老年化倾向,在这样的情况下就提出了如何保持和提高维修技术水平的课题。     

高纯铅和高纯锌

高纯铅的现状1983年西方世界铅的生产能力约为327万吨,年消费铅锭量(包括苏联)约528万吨,其中蓄电池用铅大约占60%,表1为电铅的纯度,从表1中可见,电铅可确保4个9～5个9。对更高纯度铅的需求似乎并不多,但是,最近     

混合制冷工质核态沸腾的传热研究

Heat transfer coefficients in nucleate pool boiling were measured on a horizontal copper surface for refrigerants, HFC-134a, HFC-32, and HFC-125, their binary and ternary mixtures under saturated conditions at 0.9MPa. Compared to pure components, both binary and ternary mixtures showed lower heat transfer coefficients.This deterioration was more pronounced as heat flux was increased. Experimental data were compared with some empirical and semi-empirical correlations available in literature. For binary mixture, the accuracy of the correlations varied considerably with mixtures and the heat flux. Experimental data for HFC-32/134a/125 were also compared with available correlated equation obtained by Thome. For ternary mixture, the boiling range of binary mixture composed by the pure fluids with the lowest and the medium boiling points, and their concentration difference had important effects on boiling heat transfer coefficients.