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利用吸收光谱法和直流极谱法研究了Cu~(2+)的还原状态、抗坏态、抗坏血酸浓度及溶解氧对Cu~(2+)与三磺基四苯基卟啉配位反应的影响。结果表明Cu~(2+)与三磺基四苯(?)基四苯基卟啉配位反应的可能机制为抗坏血酸首先将高价铜还原为亚铜,亚铜离子与配位剂生成对氧成对氧敏感的不稳定中间体Cu~(Ⅰ)——三磺基四:苯基卟啉配合物,立即又被溶解氧氧化为Cu(Ⅱ)——Ⅱ)——三磺基四苯基卟啉配合物。  相似文献   
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在乙醇/水体系中分别合成了Gd(Ⅲ)、Tb(Ⅲ)与D-核糖的中性配合物固体。对配合物进行元素分析和FT-IR光谱分析,结果表明该配合物组成为:LnCl_3·C_5H_(10)O_5·5H_2O(其中In=Gd或Tb),并推测了其可能的结构。  相似文献   
3.
应用荧光光谱法得Eu(Ⅲ)(EB)3配合物与DNA可形成摩尔比为41的复合物,通过磷酸盐实验与阴离子猝灭剂实验可知其相互作用为混合模式,包括嵌插作用、沟渠作用和静电作用。由双倒数法求得ΔrHmΘ=1.11×105 J/mol,ΔrGmΘ28℃=-3.24×104 J/mol,ΔrSmΘ28℃=475.08 J/(mol.K),可知该反应为熵驱动反应。  相似文献   
4.
Influence factors of the different complexing agents and auxiliary are discussed according to technology of electroless nickel plating and characteristic of the wastewater. The Treatment methods of the two chemical sediment and oxidation to adding to DTC are mentioned. Characteristic technology and existing questions in dealing with the wastewater are expounded. This method has a certain referable value for treating electroless nickel plating wastewater of the small enterprises .  相似文献   
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EDTA返滴定钡法测定硫酸根   总被引:4,自引:0,他引:4  
本文研究了在1.25×10 ̄(-3)~2.5×10 ̄(-2)mol/L硫酸的稀水溶液中用EDTA返滴定钡测定硫酸根的条件。结果表明:钡可过量0.2~2.2倍,不分离沉淀,无需乙醇等降低沉淀的溶解度,指示剂终点变色较敏锐,测定硫酸根的相对误差小于1.0%。  相似文献   
6.
Complexing agents from microorganisms   总被引:2,自引:0,他引:2  
Summary The majority of extracellular complexing ligands produced by microorganisms are summarized as being of low molecular mass (<10,000 daltons) and are usually released as part of metal detoxification processes. These exudates appear to exhibit strong metal-binding characteristics, often reducing metal toxicity. Under certain conditions microbes produce metal-specific compounds of low molecular mass called siderophores; although these are normally specific for iron they also have relatively high affinities for radionuclides such as Pu and facilitate their uptake into cells. The occurrence of specific actinide complexing agents has been recorded.The breakdown of lignins and cellulosic material produces large macromolecular compounds called humates. These contain multiligand sites and display a wide range of complexing abilities. They form both soluble and insoluble complexes with toxic elements with various results. Humates also considerably influence adsorption of metals to substrate surfaces and at high pH may compete with OH-ions for metal binding.As well as with extracellular ligands, metals can interact directly with microorganisms by accumulation in subcellular compartments or by adsorption on bacterial surfaces.  相似文献   
7.
络合法分离页岩油中的含氮化合物   总被引:5,自引:0,他引:5  
探索了用TiCl_4、CuCl_2,·2H_2O络合富集页岩油中含氮化合物的最佳条件,建立了一套络合分离页岩油中含氮化合物的实验方法,即依次用TiCl_4络合、CuCl_2·2H_2O络合、旋转薄层色谱将样品分成四个组成:未络合分、碱性分、非碱性分Ⅰ、非碱性分Ⅱ,并用IR法检验了非碱性分Ⅰ和非碱性分Ⅱ的组成。  相似文献   
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