共查询到18条相似文献,搜索用时 78 毫秒
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以稀土氯化物、席夫碱水杨醛缩苯丙氨酸和邻菲咯啉为配体,在无水乙醇溶液中反应,制备了一类新型稀土三元配合物,通过元素分析、摩尔电导、核磁共振、红外光谱、拉曼光谱,确定了该配合物的化学组成:RE(L)( Phen) Cl (H2O)(RE= Ce3 ,Sm3 , Eu3 ,Y3 ,Gd 3 ;L=席夫碱水杨醛缩苯丙氨酸;Phen=邻菲咯啉).通过抗菌实验对其抑菌效果进行研究,结果表明配合物对大肠杆菌、金黄色葡萄球菌及白色念珠菌都有较强的抑制作用,抗菌谱广;用流式细胞检测法对配合物使癌细胞凋亡能力做了初步研究,证明其具有使癌细胞凋亡的效果. 相似文献
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以己二胺和丙烯酸甲酯为原料,甲醇为溶剂,采用迈克尔加成和酰胺化缩合反应合成了低代己二胺为核的树枝状大分子。主要考察了反应条件对己二胺为核1.0G树枝状大分子收率的影响,当n(己二胺为核0.5G树枝状大分子)∶n(己二胺)=1∶6,反应温度50℃,反应时间24h,收率为69.36%。研究了以己二胺为核的1.0G树枝状大分子对O/W型模拟乳液的破乳性能。结果表明:在45℃、添加量为200ppm、60min的条件下,己二胺为核的1.0G树枝状大分子的破乳率达到80.28%。 相似文献
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石墨炉原子吸收光谱法测定地质样品中的痕量金 总被引:6,自引:0,他引:6
用活性炭吸附,于5%盐酸溶液中用甲基异丁基酮(MIBK)萃取金,采用斜坡升温和热解涂层石墨管技术进行地质样品中痕量金的石墨炉原子吸收光谱法测定,检出限为0.1ng/g。用该方法对标准物质进行测定,结果与标准值相符,测定结果的相对标准偏差为2.0%~6、9%(n=6)。 相似文献
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试液中的金首先被电解沉积到钨丝环表面上,然后悬挂在石墨杯中光束以外的部位,利用石墨壁的热辐射使全原子化。相对检测限为0.047ng/mL,金浓度在0—4ng/mL范围内线性关系较好。测定含0.014g/t金的试样数据表明,方法准确度、精密度均较好。 相似文献
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石墨炉原子吸收光谱法测定化探样品中痕量金 总被引:1,自引:0,他引:1
化探样品经650 ℃高温灼烧1.5 h后,用HNO3-HCl(1+1)溶解.取一块聚氨酯泡沫塑料(3 cm×2 cm×1 cm)吸附富集样品溶液中痕量金,通过将上述富集金的聚氨酯泡沫塑料置于硫脲溶液中沸水浴保持20 min,使金被释放出来,所得溶液供石墨炉原子吸收光谱仪测定.对石墨炉原子化条件和基体改进剂抗坏血酸的用量进行了试验并予以优化.方法的检出限(3S/N)为0.06 ng·g-1.方法用于测定国家标准样品,测得值的相对标准偏差(n=11)小于6.0%. 相似文献
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掺氧空气-乙炔火焰原子吸收光谱法测定地质样品中痕量镱 总被引:1,自引:0,他引:1
提出掺氧空气-乙炔火焰原子吸收光谱法测定地质样品中痕量镱的新方法。使用磺基水杨酸作保护剂消除铝对镱的挥发原子化干扰,KC1作消电离剂消除镱的电离干扰。方法的检出限为0.0042mg·L-1。应用于测定地质标准样品中痕量镱,结果与标准值相符,对GBW07302试样测定8次,RSD为5.41%。 相似文献
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Kiyohisa Ohta Keita Ishida Syn-ichi Itoh Satoshi Kaneco Takayuki Mizuno 《Mikrochimica acta》1998,129(1-2):127-132
A preconcentration method for nickel in waters involving adsorption on tungsten foil, followed by electrothermal atomic absorption spectrometry (ETAAS) with a tungsten tube atomizer is described. The most suitable pH for nickel adsorption was 5 and the optimum immersion time was 2 min. Severe interferences from co-existing elements (Al, Ca, Cu, Fe, K, Mg, Na, Pb and Zn) on the Ni AA signal were observed. Under optimal conditions, the preconcentration of nickel on W foil could eliminate interferences from these elements. The detection limit of nickel by preconcentration-ETAAS was 0.1 ng/ml (3S/N). The method with preconcentration on tungsten foil was applied to the determination of nickel in river water. The recovery of spiked nickel was 93–102%. The tungsten foil preconcentration method is sensitive, simple, and convenient. This adsorption method can be utilized inin situ-sampling of ultra-trace nickel in environmental samples (water). Furthermore, after sampling it is easy to carry and store the W-foil without contamination for long time. 相似文献
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Xiaodong Wen Shengchun Yang Haizhu Zhang Xia Zhao Jie Guo 《International journal of environmental analytical chemistry》2013,93(12):1243-1253
As a new developed instrument, a portable tungsten coil electrothermal atomic absorption spectrometer (W-coil ET-AAS) was first coupled with surfactant assisted dispersive liquid–liquid microextraction (SA-DLLME) to improve its analytical performance and expand its applications in this work. SA-DLLME was very simple, rapid and the extraction efficiency was considerably improved by the effect of surfactant, which was suitable to be coupled with the portable instrument in field analysis. After SA-DLLME, concentrated chromium in organic phase was directly determined on W-coil atomiser. The influence factors relevant to SA-DLLME and instrumental conditions were studied systematically. Under the optimal conditions, the limit of detection (LOD) for Cr(VI) was 0.016 µg L?1, with sensitivity enhancement factor (EF) of 107. The relative standard deviation (RSD) for seven replicate measurements of 0.5 µg L?1 of Cr(VI) was 4.6%. The recoveries for the spiked samples were in the acceptable range of 96.8–104%. The rapid, simple and high effective method greatly improved the sensitivity of this portable spectrometer for the determination of Cr(VI) and was applied to the analysis of ultra-trace Cr(VI) in real and certified water samples with satisfactory results. 相似文献
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Angeles López García Elisa Blanco González Alfredo Sanz-Medel 《Mikrochimica acta》1993,112(1-4):19-29
The determination of the trace metals Cd, Pb and Cu in seawater by electrothermal atomic absorption spectrometry (ETA-AAS) has been investigated. A combination of the platform with mixed palladium nitrate-magnesium nitrate as matrix modifier and Zeeman background correction allows Cd an Pb to be determined by aqueous standard calibration in appropriately diluted seawater samples. Copper can be determined in undiluted seawater samples without chemical modification using a standard additions method. Detection limits (3) of 2.97,5.27 and 1.1 gl–1 are obtained for Cd, Pb and Cu respectively. A Kelex-100 impregnated silica C18 material (Kelex 100-C18) has been tried and has proved to be effective as a column packing for extraction/preconcentration of these metals from seawater. Using the column extraction method, the sensitivity of the graphite furnace technique is enhanced 50-fold using a 10 l injection volume. Thus, the determination of the studied three metals in seawater at the ng.l–1 level could be achieved. 相似文献
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Nanogram quantities of heavy metals in 200 ml of water were quantitatively preconcentrated by coprecipitation with magnesium oxinate at pH 9–9.5. The precipitate was collected on a 1-m Nuclepore membrane filter and then dissolved in 5 ml of 1 mol/l nitric acid. After diluting to 10 ml with water, a 10- or 20-l aliquot of the solution was directly analyzed by electrothermal atomic absorption spectrometry using deuterium background correction. The background absorption due to the collector magnesium oxinate was negligibly small. The optimized coprecipitation technique has been applied to the determination of cobalt, nickel, copper, cadmium and lead at the ppt level in river and seawater. The relative standard deviations were within 10% and the detection limits were 0.025 (for Co), 0.019 (for Ni), 0.006 (for Cu), 0.001 (for Cd) and 0.017 g/l (for Pb). Blanks through the whole procedure were not detectable. 相似文献
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Thallium is determined in natural waters by electrothermal atomic absorption Spectrometry after preconcentration. Thallium is oxidized and retained as the tetrachlorothallate (III) ion on an anion exchange column, followed by elution with ammonium sulfite solution. A concentration factor of 400 is achieved. The detection limit of the method is 3.3 ng/1. 相似文献
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Nuray Şatıroğlu İlknur Tokgöz 《International journal of environmental analytical chemistry》2013,93(7):560-572
Cloud point extraction was applied as a preconcentration step for the determination of trace level of Al(III) in water samples with electrothermal atomic absorption spectrometry (ETAAS), flame atomic absorption spectrometry (FAAS) and UV-visible spectrophotometry. The aluminum was extracted as aluminum-Eriochrome Cyanine R (ECR) complex, at pH 6 by micelles of the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114). The investigations showed that the same CPE procedure can be used for different detection techniques. The results obtained from these techniques were evaluated. Under the optimal conditions, limit of detection obtained with ETAAS, FAAS and UV-visible spectrophotometry were 0.03 ng mL?1, 0.06 µg mL?1 and 0.01 µg mL?1, respectively. The accuracy of the procedure was tested by analysing certified reference material. The method was successfully applied to determination of aluminum in water samples and dialysis fluid. 相似文献
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Pilar Bermejo-Barrera Carmen Barciela-Alonso Adela Bermejo-Barrera 《Mikrochimica acta》1996,124(3-4):251-261
A method for the determination of cadmium in slurries of marine sediment using palladium and phosphate as chemical modifier has been optimized. To stabilize the marine sediment slurry, Triton X-100 at 0.1% was used. To obtain a complete pyrolysis of the slurry sample two mineralization steps were used, the first at 480 °C and the second at 600 °C and 700 °C for phosphate and palladium, respectively. The precision and accuracy of the method have been studied by analyzing the Reference Material PACS-1 (marine sediment) of National Research Council Canada. The detection limits (LOD) were 11.9 g kg–1 for phosphate and 42.0 g kg–1 when palladium was used. These methods have been applied to the determination of cadmium in marine sediment samples from the Galicia coast and the results of both methods were compared; no significant differences were found between the two procedures. 相似文献