共查询到20条相似文献,搜索用时 78 毫秒
1.
电感耦合等离子体质谱(ICP-MS)联用技术的应用及展望 总被引:2,自引:0,他引:2
总结了ICP-MS联用技术在国内外检测领域的最新应用,并就"分离器与ICP-MS"、"进样系统与ICP-MS"、"ICP-MS与其它仪器物理联用"等联用技术进行了分类、拓展和总结。ICP-MS联用技术的发展重点将倾向于提高分析精密度、复杂基体元素超痕量分析、同位素比值及形态研究领域,相关联用技术的国家标准或行业标准出台已迫在眉睫。 相似文献
2.
3.
环境中金属纳米颗粒的分析检测不仅需要关注其浓度和化学组成,还需要对其形状、粒径和表面电荷等进行表征。此外,环境中金属纳米颗粒的分析需要解决其低赋存浓度以及复杂基质干扰的难题。无固定相分离技术与电感耦合等离子体质谱(ICP-MS)的在线联用,具有较强的颗粒分离能力和较低的元素检出限,能够快速准确地提供金属纳米颗粒的粒径分布、化学组成等信息,在金属纳米颗粒的分离检测方面表现出极大的潜能。但这一联用技术尚无法获得金属纳米颗粒物的颗粒数浓度和单个颗粒的元素信息,难以判断金属纳米颗粒涂层厚度、纯度以及颗粒的均相/异相团聚行为等。新兴的单颗粒-电感耦合等离子体质谱(SP-ICP-MS)与无固定相分离技术的在线联用,可以获得金属纳米颗粒的流体动力学粒径、元素质量计算粒径和颗粒数浓度等信息,进而弥补无固定相分离与ICP-MS在线联用技术的不足。该文介绍了流体动力色谱、毛细管电泳和场流分离3种常用无固定相分离技术的分离机制和适用检测器,着重综述了无固定相分离技术与ICP-MS/SP-ICP-MS在线联用技术的特点及其在环境金属纳米颗粒分析中的应用。关于场流分离,主要介绍了可以与ICP-MS联用的沉降场流分离和流场流分离。该文还对流体动力色谱、毛细管电泳和流场流分离与ICP-MS在线联用技术的特点进行了比较。最后,该文对无固定相分离技术与ICP-MS/SP-ICP-MS在线联用技术的发展提出了展望。 相似文献
4.
5.
综述了电感耦合等离子体质谱(ICP-MS)及其联用分析技术的进展,论述了其在相关核工业及环境领域中分析痕量或超痕量的放射性同位素、长寿命核素、元素形态等的应用。讨论了电感耦合等离子体质谱及联用技术的发展趋势,并对目前存在的主要问题及可能的解决方案进行了讨论。 相似文献
6.
7.
8.
9.
采用激光烧蚀进样(LASI)与电感耦合等离子体质谱法(ICP-MS)测定相结合对与食品接触的金属材料的镀层及基材的快速分析。所用LSX-213型激光烧蚀进样系统具有单线扫描及深度分析两种模式。制作标准曲线及基材分析时采用单线扫描模式,对金属材料表面镀层分析采用深度分析模式。试验时,将载气氩气与氦气混合后引入LASI系统与LA释放出的样品混合形成气溶胶进入ICP-MS分析系统。每个试样在分析前先预烧蚀3次,之后重复烧蚀并采集数据7次,取其平均值。具体操作按仪器工作条件进行。用块状不锈钢标准样品制作了Si、Cr、Ni、Mn等4种元素的标准曲线,其线性范围依次为0.04%~2.0%,3.0%~20%,0.2%~20%和0.5%~20%,检出限(3S/N)依次为400,10.0,1.00,20.0ng·g~(-1)。对3件未知样品按此方法进行7次测定,测得Cr、Ni、Mn、Si等4种元素的平均相对标准偏差(n=7)依次3.2%,5.3%,3.9%,6.2%。应用所提出的方法分析了一件牛排刀样品和一件汤匙样品。在牛排刀的分析中,查明了此刀的刀身和刀柄属于两种不同规格的不锈钢,在制造中用了"灌铅技术"将两种钢材粘合在一起,造成了此食具中铅含量严重超标。在汤匙的分析中,确认其为镀金的不锈钢所制成。 相似文献
10.
电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry,ICP-MS)具有灵敏度高、干扰少、选择性好、适合进行超痕量多元素同时分析和同位素比值的测定等优点,在法庭科学中得到了广泛应用.综合归纳了ICP-MS技术在重金属及有害元素投(中)毒案件、食品药品环境分析、交通肇事及涉枪等案(事)件中重金属及微量元素分析中的应用.介绍了不同检材的样品前处理方法以及如何减少基体干扰,并且综述了优化ICP-MS仪器参数和碰撞反应池技术以消除质谱干扰,展望了ICP-MS在法庭科学中的应用. 相似文献
11.
Nicole Kindermann Dr. Eckhard Bill Dr. Sebastian Dechert Dr. Serhiy Demeshko Dr. Edward J. Reijerse Prof. Dr. Franc Meyer 《Angewandte Chemie (International ed. in English)》2015,54(6):1738-1743
Copper enzymes play important roles in the binding and activation of dioxygen in biological systems. Key copper/dioxygen intermediates have been identified and studied in synthetic analogues of the metalloprotein active sites, including the μ‐η2:η2‐peroxodicopper(II) motif relevant to type III dicopper proteins. Herein, we report the synthesis and characterization of a bioinspired dicopper system that forms a stable μ‐η1:η1‐peroxo complex whose Cu‐O‐O‐Cu torsion is constrained to around 90° by ligand design. This results in sizeable ferromagnetic coupling between the copper(II) ions, which is detected by magnetic measurements and HF‐EPR spectroscopy. The new dicopper peroxo system is the first with a triplet ground state, and it represents a snapshot of the initial stages of O2 binding at type III dicopper sites. 相似文献
12.
13.
14.
The analytical form of the perturbation theory for the MC SCF method of Veillard and Clementi is presented. The appropriate second-order energy functional which takes into account the self-consistency requirements, leads to a set of coupled first-order perturbed equations determining the perturbed configuration coefficients and orbitals. The second-order energy formula derived from this functional can be given a clear physical interpretation. The present analytical approach is compared with the finite perturbation MC SCF scheme. The possibility of the approximate solution of the coupled MC SCF perturbation equations is also discussed and the so-called uncoupled procedures are devised. In the limit of the single determinant wave function the present formulae are shown to be equivalent to the appropriate Hartree-Fock perturbation results. The differences between the one-configuration SCF and the MC SCF approach are illustrated by the calculation of the electric dipole polarizability of. HZ in the CNDO/2 approximation. It is shown that the one-configuration SCF approaches cannot account for the correct asymptotic properties of the second-order energy for large internuclear distances. This feature of the SCF perturbation theories does not depend on the specific approximations of the CNDO/2 scheme and is corrected by using the MC SCF perturbation theory. 相似文献
15.
电感耦合等离子体光谱仪器技术进展与现状 总被引:1,自引:0,他引:1
辛仁轩 《中国无机分析化学》2011,1(4):1-8
介绍了电感耦合等离子体光谱分析仪器技术的发展历程及主要技术特点,并分别评述了目前三种典型ICP光谱仪器及其技术现状和新进展,它们分别是:顺序扫描型ICP光谱仪、同时型ICP光谱仪及顺序-同时型ICP光谱仪。最后介绍了几种有较好应用前景的光谱新光源:静态高灵敏ICP(SHIP)光源,高功率微波等离子体光源,电容耦合等离子体光源,炬内进样短炬管等。 相似文献
16.
Coupled cluster (CC) and density-functional theory (DFT) calculations of optical rotation, [alpha](lambda), have been carried out for the difficult case of (S)-methyloxirane for comparison to recently published gas-phase cavity ringdown polarimetry data. Both theoretical methods are exquisitely sensitive to the choice of one-electron basis set, and diffuse functions have a particularly large impact on the computed values of [alpha](lambda). Furthermore, both methods show a surprising sensitivity to the choice of optimized geometry, with [alpha](355) values varying by as much as 15 deg dm(-1) (g/mL)(-1) among molecular structures that differ only negligibly. Although at first glance the DFT/B3LYP values of [alpha](355) appear to be superior to those from CC theory, the success of DFT in this case appears to stem from a significant underestimation of the lowest (Rydberg) excitation energy in methyloxirane, resulting in a shift of the first-order pole in [alpha](lambda) (the Cotton effect) towards the experimentally chosen incident radiation lines. This leads to a fortuitous positive shift in the value of [alpha](355) towards the experimental result. The coupled cluster singles and doubles model, on the other hand, correctly predicts the position of the absorption pole (to within 0.05 eV of the experimental result), but fails to describe correctly the shape/curvature of the ORD region lambda=355, resulting in an incorrect prediction of both the magnitude and the sign of the optical rotation. 相似文献
17.
《Analytical letters》2012,45(16):2593-2605
A method was developed for the determination of vitamin B12 based on the enhancement of cobalt (II) on the chemiluminescence (CL) reaction between luminol and percarbonate (powerful source of hydrogen peroxide). The release of cobalt (II) from the vitamin B12 was reached by a simple and fast microwave digestion (20 s microwave digestion time and a mix of nitric acid and hydrogen peroxide). A charge coupled device (CCD) photodetector, directly connected to the cell, coupled with a simple continuous flow system was used to obtain the full spectral characteristics of cobalt (II) catalyzed luminol-percarbonate reaction. The optima experimental conditions were established: 8.0 m mol L?1 luminol in a 0.075 mol L?1 carbonate buffer (pH 10.0) and 0.15 mol L?1 sodium percarbonate, in addition to others experimental parameters as 0.33 mL s?1 flow rate and 2 s integration time, were the experimental conditions which proportionate the optimum CL emission intensity. The emission data were best fitted with a second-order calibration graph over the cobalt (II) concentration range from 4.00 to 300 µ g L?1 (r2 = 0.9990), with a detection limit of 0.42 µ g L?1. The proposed method was successfully applied to the determination of vitamin B12 in pharmaceuticals. 相似文献
18.
19.
《中国无机分析化学》2017,(4)
建立了以艾斯卡试剂分解样品,以阳离子交换树脂分离基体中钠和锌,电感耦合等离子体质谱(ICP-MS)法测定地球化学样品中碘的方法。方法经国家一级标准土壤参考样品验证,方法的检出限为0.006 9μg/g、相对标准偏差为3.3%~7.6%和相对误差为-2.3%~4.1%。方法能够满足地球化学样品的分析测定要求。且方法操作简便,测定成本低,分析周期短,适合于批量样品的分析测定。 相似文献