共查询到19条相似文献,搜索用时 78 毫秒
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本文以大孔聚氯乙烯树脂为原料,合成聚乙烯乙二胺丙酰胺肟螯合树脂,建立了利用该螯合树脂富集分离20余种微量元素的ICP化学光谱法,讨论了其富集各待测元素的性能和机理,进行了螯合树脂的红外光谱等结构分析及样品中微量元素的富集和测定,结果较满意。 相似文献
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茜素红S螯合树脂分离富集测定地质样品中的痕量金、铂和钯 总被引:10,自引:0,他引:10
用螯合树脂对金属进行分离富集及测定,前人已做了许多有意义的研究[1~4].曾用含键合S双硫腙(P-D)和脱氢双硫腙(P-DT)功能团的离子交换树脂和螯合树脂分离金和铂族金属[5],用双硫腙负载树脂分离富集Cu(Ⅱ)[6]。 相似文献
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在线螯合树脂富集火焰原子吸收光谱法测定天然水体中铜和锌 总被引:2,自引:0,他引:2
对螯合树脂富集——火焰原子吸收光谱法测定天然水体中痕量铜和锌的在线富集条件、干扰因素等进行研究,在线富集倍数达到两个数量级,在灵敏度与石墨炉原子吸收光谱法相当情况下,提高了测定准确度。 相似文献
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含硫氮的螯合树脂及其金属螯合物的X—光电子能谱研究 总被引:1,自引:0,他引:1
螯合树脂的合成及其对各种金属离子的吸附性能研究已有大量文献报道。螯合树脂由于对某些金属离子具有优良的吸附选择性,以及其他优点现已广泛应用于金属的富集与分 相似文献
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本文研究了550螯合树脂对铜的吸附性能,进行了分离富集条件的选择,观察了铜与钴等多种共存离子的分离效果。结果表明,550螯合树脂对铜吸附性能良好,能从大量钴中分离微克量铜。拟定了钴电解液中微量铜的测定方法。初步应用效果好。回收率为90—102%,相对标准偏差小于5%。 相似文献
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海水中的钕(Nd)同位素性质稳定,被广泛用于海洋学过程的研究。由于海水中Nd含量很低,且在测定过程中易受钐(Sm)的影响,因此富集和纯化成为海水中Nd同位素分析的必要步骤。传统的分离方法通常是利用氢氧化铁共沉淀法富集海水中的稀土元素(REEs),再用LN-C50-A树脂对Nd进行分离纯化。但富集过程较为耗时。本研究采用NOBIAS螯合树脂对海水中的稀土元素进行富集,优化了上样pH值、NOBIAS PA1螯合树脂淋洗酸浓度、LN-C50-A树脂淋洗酸体积等实验条件。结果表明,当pH=4.7时,NOBIAS PA1螯合树脂对钕的回收效率大于99%;LN-C50-A树脂对钕分离纯化的回收效率大于93%。本方法重现性好(RSD1.5%,n=3),且系统误差对钕同位素的测定无显著影响(RSD5%,n=5),能满足海水中钕及其同位素分析精度的要求。 相似文献
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树脂悬浮光度法测定天然水中的微量钴 总被引:1,自引:0,他引:1
近年来,螯合树脂作为富集、分离的一种方法已在分析领域里逐渐被采用。而将螯合树脂在富集离子后,直接测定有色树脂吸光度的方法也有所见。例如Yoshimura等人就利用富集离子后的有色树脂直接进行光度测定;大关邦夫等人将富集离子后的有色树脂过滤涂于透明的纸上进行光度测定。这种将树脂富集被测离子后直接进行光度测定的方法称为离子交换光度法。其主要特点是将富集手段和分析方法结合起来;它的灵敏度比同样的试剂进行光度测定提高10~100倍。但也存在一定的问题。如对一毫米比色杯的吸光性能的要求较高;特别是对树脂填装比色皿或涂层的技术要求也较高,较严格。为此,我们提出了“树脂悬浮光度测定法”,即将富集离子后的有色树脂悬浮在甘油中, 相似文献
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A functionalized carbon nanotube (CNT), CNT 2,5-dihydroxybenzoyl hydrazine derivative, was synthesized and used as both pH adjustable enriching reagent and matrix in matrix assisted laser desorption/ionization mass spectrometry (MALDI-MS) analysis of trace peptides. The derivative reagent, 2,5-dihydroxybenzoyl hydrazine, introduced phenolic hydroxyl and phenyl groups to the surface of the CNT. The former group can provide adjustable surface charge and a source of protons for chemical ionization, and the latter helps to keep strong ultraviolet absorption for enhancing pulsed laser desorption and ionization. It was found that the functionalized CNT was less twisted in a basic condition (pH 10.5), which afforded an increased surface area to volume ratio for adsorption towards trace peptides. However, functionalized CNT becomes deposited in an acidic condition (pH 5) and can be isolated readily from the sample solutions once the nanoparticles have trapped the target analytes, thus providing a novel and convenient alternative method for quick isolation. Compared with the previously reported method on enriching analytes using the pristine CNT, it is observed that the detection limit for analytes can be greatly improved due to enhancing adsorption capacity of the functionalized CNT. Moreover, peptide mixture at concentration as low as 0.01 pg/microL still can be detected after enrichment mediated by the functionalized CNT, while it is difficult to be detected without enrichment at concentration 0.1 pg/microL using alpha-cyano-4-hydroxycinnamic acid (CHCA) as matrix. Therefore, high efficiency of adsorption and enrichment towards trace peptides can be achieved by adjusting pH value of the functionalized CNT dispersion. 相似文献
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石英缝管火焰原子吸收法测定食醋中的痕量铅 总被引:4,自引:0,他引:4
采用石英缝管装置,辅助火焰原子吸收光谱法测定了食醋中的痕量铅。对铅的测量灵敏度较常规火焰原子吸收法提高了4倍以上。装置简单,方法简便,有效地降低了对测量灵敏度较低的组分的富集要求,提高了分析结果的可靠性。 相似文献
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Andrey V. Blinov Shahida A. Siddiqui Andrey A. Nagdalian Anastasiya A. Blinova Alexey A. Gvozdenko Vladislav V. Raffa Natalya P. Oboturova Alexey B. Golik David G. Maglakelidze Salam A. Ibrahim 《Arabian Journal of Chemistry》2021,14(7):103229
To solve the problem of insufficient intake of essential macro - and micronutrients into the human body, particularly in the case of the essential trace element Zinc, the possibility of enriching a socially significant product (milk) with various forms of Zinc is considered. The influence of Zinc-containing compounds on the colloidal milk system's dispersed composition and stability, photon correlation spectroscopy methods, acoustic and electroacoustic spectroscopy was established in this research. It has been shown that Zinc lysinatoriboflavinate, is a colloidal and chelated organic form of the essential trace element Zinc, having the most negligible effects on the composition and stability of the dispersed phase particles. This increases the average hydrodynamic radius of the dispersed phase by 5% and the ζ-potential by 10%.A quantum-chemical simulation of the interaction of milk κ-casein sites with various forms of the essential trace element Zinc in the QChem program was performed using the IQmol molecular editor. The mechanism of action of various forms of Zinc on the components of the dispersed system of milk, in particular milk protein (casein), is suggested. 相似文献
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本文利用自制的浮选装置,选择四氢呋喃和无水乙醇(4+1)混合溶液作溶剂,氯化钠作分相剂,将Fe(Ⅲ)与土霉素(OTC)形成的疏水性缔合物浮选至有机相,然后采用分光光度法测定,方法线性线性范围为6.6×10~(-7)~3.4×10~(-5) mol/L;检出限为3.63×10~(-7) mol/L;平均回收率为99.95%;表观摩尔吸光系数ε=2.028×10~5 L·5moL~(-1)·5cm~(-1).该方法设备简单、测定快速、灵敏度高、分离物质易于提取和不产生二次污染,可用于环境水样中痕量土霉素的快速测定. 相似文献