在盐酸溶液中钼酸钠对软钢的缓蚀作用及其与乙叉二磷酸钠的协合缓蚀效应(英文)

考察了钼酸在盐酸溶液中对软钢的缓蚀作用,求出了ΔＨ°,ΔＧ°,ΔＳ°３个反应状态函数及活化能,并用吸附理论解释了缓蚀原因．同时发现钼酸钠和乙叉二磷酸钠混合使用时,对软钢产生良好的协合缓蚀效应     

乙醇-盐-水-5-Br-PADAP体系中萃取分离测定钌

研究了在硫酸铵存在下,5-Br-PADAP乙醇体系中Ru(Ⅲ)、Pd(Ⅱ)的萃取行为以及乙醇溶液的分相条件,讨论了影响萃取率的各种因素,实验表明:85℃水浴中,pH5.5~6.5内,该体系中Ru(Ⅲ)可完全被乙醇相萃取,但室温下,pH1.0~7.0内,Pd(Ⅱ)萃取率可达100%,而Ru(Ⅲ)不能被萃取,因此可实现Ru(Ⅲ)、Pd(Ⅱ)混合离子的定量分离,同时建立了钌的测定方法.pH5.80时,乙醇相中Ru(Ⅲ)-5-Br-PADAP配合物的表观摩尔吸光系数约为1.081×105L.mol-1.cm-1,Ru(Ⅲ)含量在0~8.00μg/10 mL内符合比尔定律,检出限为0.012μg/mL.该法用于混合样中钌的分离测定,结果满意.     

水资源化——卤水制碱

卤水与固态碳酸氢铵在一定的条件下反应得到重碱和母液,重碱经煅烧分解为纯碱,母液经处理后可得到氯化铵和硫酸钠,从而实现废水(卤水)资源化,变废为宝。     

A theoretical investigation on phase transition and dissociation of ammonium bromide under high pressure

Structures of ammonium bromide under high pressure were investigated through ab initio evolutionary algorithm and total-energy calculations based on density functional theory. Static enthalpy calculations indicate that the low-pressure phase V（space group P4/nmm） transforms into a monoclinic P21/m structure at 71 GPa and then an orthorhombic structure Cmma at 130 GPa, which is found to be energetically stable up to 264 GPa. Mechanism of phonon softening at the P4/nmm P21/m transformation is discussed. Ab initio calculations show that the band overlap in the molecular Cmma phase, which causes the pressure-induced insulator-to-metal transition, occurs at about 240 GPa. Enthalpy calculations show that Cmma NH4 Br becomes unstable and dissociates into NH3 and HBr above 264 GPa.     

热浸镀锌钢板钼酸盐复合钝化膜的耐腐蚀性能

应用极化曲线和电化学阻抗谱方法研究钼酸盐与丙烯酸树脂复合钝化膜在3.5%的NaCl溶液中的电化学性能,采用中性盐雾试验和盐水浸泡试验检测试样耐腐蚀性能,利用扫描电子显微镜观察钝化膜的微观形貌.与未经钝化的热浸镀锌钢板和经铬酸盐钝化的热浸镀锌钢板相比,钼酸盐与丙烯酸树脂复合钝化的热浸镀锌钢板抗腐蚀性较好,其腐蚀电位更正,...     

Improved Activity Assay Method for Arginine Kinase Based on a Ternary Heteropolyacid System

IntroductionArginine kinase ( EC 2 . 7. 3. 3,AK ) in inver-tebrates plays a central role in both temporal andspatial ATP buffering in cells with high,fluctuating energy requirements( muscle,nerves,etc.) by catalyzing the magnesium- dependentreversible phosphorylation between L- arginine andATP according to the following reaction[1,2 ]L- arginine+ Mg.ATP N- phospho- L- arginine+ Mg.ADP ( 1 )　 AK is an ideal paradigm for the classicalenzymology of bimolecular reactions[3 ,4] andactivit…     

［N(CH3)4］4［Mo10O18(OH)4(O2)10(O2)2］·6H2O的合成、晶体结构及表征

以质量分数30%过氧化氢为氧化剂,钼酸铵和四甲基氯化铵为原料,室温下采用常规的水溶液法成功制备了一种含有过氧与超氧基团的十核钼酸四甲基铵盐［N(CH₃)₄］₄［Mo₁₀O₁₈(OH)₄(O₂)₁₀(O₂)₂］·6H₂O,并对其进行了元素分析、红外光谱、紫外光谱表征及X线单晶结构分析.该化合物属于单斜晶系,P2₁/c空间群,a=1.443(16)nm, b=1.168(12)nm, c=1.693(17)nm,β=99.32(3)°, V=2.814(5)nm³, Z=2, D_c=2.441 g/cm³, R₁=0.035 6, wR₂=0.105 0(I>2, GOF=1.087.其阴离子呈中心对称结构,包含2个键长为0.114 5 nm的超氧基团和10个键长为0.143 5~0.148 1 nm的经典过氧基团.此化合物溶于水不稳定,但在室温下能稳定存在于固态,并能迅速将I^- 氧化成单质I₂,表明了该化合物由于结构中过氧和超氧基团的存在而具有强氧化性.     

Prokaryote-eukaryote interactions in trace element metabolism.Desulfovibrio sp. inHelix aspersa

Summary Snails (Helix aspersa) contain sulphate-reducing bacteria in their crops. Feeding such animals on food containing sulphate and molybdate ions does not induce a copper deficiency and in fact the bacteria appear to facilitate metal absorption. This is in contrast to the effects of these bacteria in ruminant cattle.     

基于多金属钼氧酸盐阴离子构筑的配合物[Zn（bpy）Mo3O（10）]的合成及晶体结构

利用水热合成法得到了含有类梯形钼氧酸盐阴离子片段且具有二维层状结构的配合物[Zn（bpy）Mo3O10]1.通过X射线衍射确定晶体结构,应用元素分析、红外光谱、热重分析对晶体进行了表征.结果表明,构筑配合物的{Mo3O10}2-阴离子呈一维带状结构,由{MoO6}八面体、{MoO5}四方锥和{MoO4}四面体三种钼氧单元共同构成,并通过{Zn（bpy）}2＋基团连接成二维层状结构.     

Na_2SO_4-Na_2MoO_4体系的离子导电性与导电机理研究

本文对晶态Na_2SO_4-Na_2MoO_4体系的离子导电性进行了研究;并得出在Na_2MoO_4含量为10m/o时电导率最大(σ=1.01×10~(-4)Ω~(-1)cm~(-1).300℃);XRD、DTA分析表明,该组成处为一新相Na_2Mo_(0.1)S_(0.9)O_4,其相变温度为212℃、425℃,在相变处对应于明显的电导率突变。根据IR谱实验结果和新相的结构特点,讨论了该体系的导电机理。