环境介质中硒的检测方法研究进展

结合国内外的研究进展,综述了环境介质中硒的各种检测方法。其中重点介绍了比较常用的测定方法,如原子吸收光谱法(AAS)、原子荧光光谱法(AFS)和电感耦合等离子体原子发射光谱法(ICP-AES)等,并展望了硒在检测方法上的发展趋势。

Synthesis and evaluation of Gd-DTPA-labeled arabinogalactans as potential MRI contrast agents

Arabinogalactan derivatives conjugated with gad olinium-diethylenetriaminepentaacetic acid (Gd-DTPA) by ethylenediamine (Gd-DTPA-CMAG-A(2)) or hexylamine (Gd-DTPA-CMAG-A(6)) have been synthesized and characterized by means of Fourier transform infrared spectra (FTIR), C-13 nuclear magnetic resonance (C-13 NMR), size exclusion chromatography (SEC), and inductively coupled plasma atomic emission spectrometry (ICP-AES).

Synthesis and characterization of nano-scale Terbium (III)-trimesic acid (TMA)-1,10-phenanthroline(phen) luminescent complex

The nano-scale luminescent complex of Terbium(III)-trimesic acid (TMA)-1,10-phenanthroline(phen) was successfully synthesized by co-precipitation method in this paper. The chemical formula of the synthesized complex was speculated to be Tb(TMA)(phen)(0.0125)center dot 5H(2)O by elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and Fourier-transform infrared spectroscopy (FTIR). XRD pattern of Tb(TMA)(phen)(0.0125)center dot 5H(2)O indicated that it was a new crystalline complex since the diffraction angle, diffraction intensity and the distance of crystal plane were all different from those of the two ligands. TG curve proved that the synthesized nano-scale luminescent complex was stable in the range from ambient temperature to 464 degrees C in air. TEM images showed that the complex was spherical shape with an average size of 40 nm.

稀土基AB2型金属氢化物电极衰变机理的探索

用真空电弧熔炼合成了稀土基AB2 型合金.真空电弧合成的稀土基AB2 型合金不具有Laves Phase 的单相结构,而是由多相组成.用XRD、SEM和XPS 对多次充/放电循环后电极合金结构、形貌进行了分析,用ICP-AES 分析电介质溶液中电极合金组成元素的含量,探索了稀土基AB2 型合金作为金属氢化物电极的衰变机理.实验结果表明:腐蚀是稀土基AB2 型合金氢化物电极合金结构变化和电化学性能衰变的主要原因.

Synthesis and evaluation of novel polysaccharide-Gd-DTPA compounds as contrast agent for MRI

Macromolecular conjugates of two kinds of natural polysaccharides, that from Panax quinquefolium linn (PQPS) and Ganoderma applanatum pat (GAPS), with gadolinium-diethylenetriaminepenta-acetic acid (Gd-DTPA) have been synthesized and characterized by means of FTIR, elementary analysis and ICP-AES. Their stability was investigated by competition study with Ca2+, EDTA (ethylenediaminetetraacetic acid) and DTPA. Polysaccharide-bound complexes exhibit T-1 relaxivities of 1.5-1.7 times that of Gd-DTPA in D2O at 25degreesC and 9.4T. MR imaging of Sprague-Dawley (SD) rats showed remarkable enhancement in rat liver and kidney after i.v. injection of these two complexes: liver parenchyma 60.9+/-5.6%, 57.8+/-7.4% at 65-85 min; kidney 144.9+/-14.5%, 199.9+/-25.4% at 10-30 min for PQPS-GdDTPA, GAPS-Gd-DTPA at gadolinium dose of 0.083 and 0.082 mmol/kg, respectively. Our preliminary in vivo and in vitro study indicates that the two kinds of polysaccharide-bound complexes are potential tissue-specific contrast agents for MRI.

Arabinogalactan as a carrier for contrast agent in magnetic resonance imaging

Arabinogalactan-Gd-DTPA was synthesized by the reaction of diethylenetriaminepenta-acetic acid (DTPA) bisanhydride with polysaccharide in dry DMSO and characterized by FTIR, elemental analysis and ICP-AES. Its stability was investigated by competition with Ca2+, EDTA, DTPA. The t(1)-relaxivity is 8.06 mmol(-1) . L . s(-1) in D2O, 8.48 mmol(-1) . L . s(-1) in 0.725 mmol . L-1 BSA, respectively. t(1)-weighted MR imaging of rat kidney and liver showed a remarkable enhancement post injection of Arabinogalactan-Gd-DTPA. The results indicate that the arabinogalactan-Gd-DTPA is a potential contrast agent for MRI.

四铁取代的夹心型钨砷酸盐的合成及玻碳电极表面多层膜组装与电催化性质研究

碳电极表面的修饰在电化学和材料科学中很重要 .最近 ,通过层与层电子间的相互作用来自组装修饰玻碳电极已引起人们的关注 [1] .运用这种方法可将一些功能团修饰到电极表面 ,赋予电极一些新的功能 [2 ] .过渡金属取代的多金属氧酸盐不仅在配位环境 ,而且在催化活性方面都类似于金属卟啉和其它大环配体金属配合物 [3] .将其修饰到玻碳电极表面已有文献报道 [4 ] .由于修饰电极的厚度可控、成分可调及具有良好的电催化活性 ,在生物传感器和电子器件等方面具有潜在的应用前景 .取代型夹心型多金属氧酸盐具有大摩尔质量和高电荷密度 ,表现出优秀的磁性和催化活性 [5] ,将成为玻碳电极表面的修饰材料 .我们首次制备了四铁取代的夹心型钨砷酸盐 Na12 [Fe4 ( H2 O) 2 ( As2 W15O56 ) 2 ]·41 H2 O,通过元素分析 ,IR,UV和 NMR对其进行了表征 ,并通过自组装将其修饰到玻碳电极表面形成多层膜 .此修饰电极对 NO- 2 和 H2 O2 具有电催化活性 ,可望成为检测 NO- 2 和 H2 O2 浓度的探针 .1　实验部分1 .1　仪器和试剂　 ICP- AES等离子体发射光谱仪 ...

以阿拉伯半乳聚糖为载体的磁共振成像造影剂的研究

合成了阿拉伯半乳聚糖修饰的 DTPA钆配合物 ,用红外光谱、元素分析、 ICP-AES等手段进行了表征 ,用竞争性方法研究了其在水溶液中的稳定性 ,测试了其在水中及 BSA溶液中的弛豫性能 ,并进行了体内成像实验 .结果表明 ,其弛豫效率是目前临床所用造影剂 Gd-DTPA的 1 .5～ 2 .0倍 ,对肝脏和肾脏 MRI信号具有良好的增强效果 ,是比较好的潜在磁共振成像造影剂

电感耦合等离子体发射光谱法测定东北大豆中微量元素

用电感耦合等离子体原子发射光谱法 (ICP AES)测定了 11种东北大豆中大量、小量和微量元素。比较了两种湿法消解方法 ,HNO3 HClO4,HNO3 H2 SO4和干灰化法对分析结果的影响。由于大豆含有较多的油脂 ,用混合酸消解时费时较长且需加入较多的酸 ,从而可能产生较高的背景空白 ,因此对大豆样品的前处理采用干灰法较为合适。大豆中钾和磷是大量元素 ,本工作还研究了钾和磷对其他元素测定的影响。结果表明 ,大豆中钾和磷对其他微量元素的测定没有影响。结果还表明 ,这 11种大豆中的各微量元素的含量没有显著性差异

Effect of LB monolayers on the mixed crystals of Lead and barium sulfate

The effect of LB monolayers on the mixed crystal was investigated by using X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), and Inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The results show that LB monolayer has selectivity for the different nucleation ions with equal charge numbers and about the same ion radius. The selectivity is dependent on the head groups of monolayer. The monolayer and the doped ions have also an effect on the crystal morphology. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

Characteristics in frequency domain by inductively coupled plasma atomic emission spectrometry with charge injection detection

The charactesistics of two-dimension spectra obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES) with charge injection detection (CID) in frequency domain were studied in the present paper. The measurement spectra were Fourier transformed and the frequency distribution of the spectra was obtained. Results showed that the spectra in frequency domain could he divided into two parts:high frequency and low frequency signals. The later stood for measurement spectra and the former for background and noises. However, the high frequecny signals could not be smoothed simply to reduce noises because the background was deteriorated even though the spectral signal did not change significantly.

Analysis of mussel standard reference material by inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry

A method for the analysis of mussel standard reference material by inductively coupled plasma atomic emission spectrometry( ICP-AES) and inductively coupled plasma mass spectrometry(ICP-MS) was developed. K, Na, Ca, Mg, P, Al, Fe, Zn, Mn and Sr were determined by ICP-AES and As, B, Cd, Co, Cr, Cu, Ga, Ge, Mn, Mo, Ni, Pb, Se, Sr, U and V by ICP-MS, The interference coefficients at the Mn-55, Se-78, Cu-63, Co-59, Ni-58, Ni-60, As-75, Se-77, V-51, Cr-53 and Cr-52 originating from polyatomic ion of the matrix elements (KO)-K-39-O-16, K-39(2), (ArNa)-Ar-40-Na-23, (CaO)-Ca-43-O-16, (CaO)-Ca-42-O-16, (CaO)-Ca-44-O-16, (PO2)-P-31-O-16, (ArCl)-Ar-40-Cl-35, (ArCl)-Ar-40-Cl-37, (ClO)-Cl-35-O-16, (ClO)-Cl-37-O-16 and (ArC)-Ar-40-C-12 were determined under the selected operation parameters. The major matrix elements, such as K, Na and Ca, result in the suppression of analytes signals. The apparent concentration at the significant biological element which was produced by the different digestion methods, (.) HNO3 + H2O2 (3 + 2), HNO3 + HClO4 (3 + 0.5) and HNO3 + H2SO4 (3 + 0.5),was determined. The sample digested by HNO3 + H2O2 did not give rise to interfere on the analyte, and the backgrounds of Se-77, Ga-69, Zn-67, As-75, V-51, Cr-53 and Cr-52 were increased by HNO3 + HClO4 digestion method, that affected the determination of these elements, especially the monoisotope As and V. Sample digested by HNO3 + H2SO4 increased the backgrounds at Cu-65, Zn-64 and Zn-67. Detection limits of ICP-AES are 0.001 similar to 0.75 mg/L and those of ICP-MS are 0.005 similar to 1.01 mu g/L. The relative standard derivations of ICP-AES and ICP-MS are 2.7% similar to 12.8%, 3.4% similar to 24.8%, respectively.

因子分析-电感耦合等离子体原子发射光谱分析中的峰位优化及光谱干扰校正

将目标因子分析用于电感耦合等离子体原子发射光谱分析(ICP-AES)对高纯氧化铥中稀土杂质的测定及光谱重叠干扰校正．数据矩阵由纯光谱矢量、混合物光谱矢量及模型背景矢量构成．提出利用各目标矢量的真误差的平方和为评价函数优化扫描光谱峰位，从而消除扫描式ICP光谱仪发射光谱线的峰位移动给测定带来的影响

Artificial neural network applied to diagnosis of lung cancer

Artificial neural network(ANN) approach was applied to classification of normal persons and lung cancer patients based on the metal content of hair and serum samples obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES) for the two groups. This method was verified with independent prediction samples and can be used as an aiding means of the diagnosis of lung cancer. The case of predictive classification with one element missing in the prediction samples was studied in details, The significance of elements in hair and serum samples for classification prediction was also investigated.

电感耦合等离子体原子发射光谱分析信息系统的开发 Ⅰ.系统分析

根据电感耦合等离子体原子发射光谱(ICP-AES)分析的实际需要，开发了一种ICP-AES分析信息系统。该系统包括谱线管理系统、识别干扰程度系统、校准及干扰校正系 统、帮助系统等子系统。本文将讨论系统分析。系统设计和系统评价将在另文中讨论。