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近年来,对溶液络合物的研究日益增多,了解金属在水溶液中的离子状态,也是当前我们无机化学工作者的重要任务之一。研究这些问题的方法很多:诸如离子交换法、光度法、电位滴定法、极谱法、溶解度法及萃取法等等。本文仅将对萃取法研究水溶液的诸问题作较详细的介绍。萃取法又称分配法,是以上所述方法中此较简单、快速而又准确的方法之一,应用溶剂萃取不需要复杂的仪器,所需用的研究物质很少,因此近年来很 相似文献
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99mTc水杨醛Schiff碱配合物的制备与生物分布 总被引:2,自引:0,他引:2
One novel complex of ^99mTc-salicylidene-tyrosine Schiff base was designed and synthesized, and its biodistribution was investigated. The theoretical simulation revealed that the cis- and trans-isomers might co-exist in aqueous solution. A yield higher than 90% under the optimal condition of synthesis was obtained. Good water-solubility was demonstrated. Very little uptakes in muscle, brain, heart and S-180 sarcoma, as well as very rapid blood clearance were revealed in mice. Good accumulation in bone was shown. At 1h postinjection the bone uptake was 10.9% ID/g. At 3 and 5h postinjection, bone-to-muscle ratios were 19.0 and 9.3, and bone-to-blood ratios were 31.6 and 28. 9, respectively. The result indicates a bone imaging potency of the complex. 相似文献
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1983年6月13日至17日第一届国际生物无机化学学术报告会在意大利佛罗伦萨市召开,来自卅多个国家的五百多位科学家参加了会议。会议委员会由四人组成,主席为佛罗伦萨大学化学系Bertini教授。会议上的论文摘要已刊于“Inorganica Chimica ACTA”第79卷(1983)。 相似文献
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本文报道以白鼠和发光杆菌为材料进行了两组实验,发现硒与大骨节病病区饮用水中腐植酸之间,存在对毒性能相互抑制的拮抗作用。为探讨其化学机制,以凝胶过滤色谱、X线光电子能谱等技术,探讨了腐植酸硒水溶液体系及合成物的化学键合作用。并对硒与腐植酸在大骨节病病因中可能的关系进行了讨论。 相似文献
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In this work, two groups of experiments have been done by using mice and luminous bac-teria. The resnlts show that there exists an antagonism in toxicity between selenium andhumic acid (HA) extracted from the drinking water in Kaschin Beck disease regions. In order tostudy the chemical mechanism of the antagonism, gel filtration and X-ray photoelectron spec-troscopy techniques have been used to study the chemical bonding of the synthetic HA-Se insolution. The relationship between Se and HA in the cause of Kaschin Beck disease isdiscussed. 相似文献
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华北模拟实验块地大气、降水、地表径流和土壤中的稀土浓度分布及施用农用稀土的影响 总被引:5,自引:1,他引:5
通过模拟实验块地,初步研究了在一个土壤生态系统中稀土的浓度分布以及施用稀土微肥的影响。结果表明:降水、地表径流水溶液中的稀土浓度均为μg/L量级(01~12μg/L),降水中的稀土主要来源于附近地表土壤。大气中的稀土含量随粒径分布有所不同,粒径越小含量越低,且其来源主要是附近的土壤,水可溶性的硝酸稀土微肥在施用后很快转化为水不溶性形态,施加稀土前后实验组表层土壤中稀土含量基本相同。与对照组相比,施加的稀土微肥对地表径流水溶性和悬浮物稀土浓度未产生明显影响。 相似文献
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