钐、铕-四环素类抗生素络合物荧光性能的研究及其在荧光分析中的应用

本文探讨了钐、铕-四环素、强力霉素、土霉素、金霉素络合物的荧光性能及利用该体系以荧光分析光度法测定痕量钐和铕的可能性与最佳测定条件.结果表明:在高碱度条件下(pH12～1.0mol/L NaOH),以四环素体系的稳定性、灵敏性最好,钐和铕的检测限分别为38.2和0.09ng/mL.     

TTA-TOPO萃取荧光分析法测定岩矿及环境试样中的痕量钐和铕

作者等曾考察了钐、铕和噻吩甲酰三氟丙酮(TTA)与三正辛基膦化氧(TOPO)所形成的三元络合物的荧光特性,并应用于测定稀土矿物中的钐、铕。本文将此法应用于测定岩矿及环境试样中的钐和铕,结果较为满意。 1.主要试剂和仪器: (1)1ppm钐和0.1ppm铕标准溶液(0.1N盐酸)。 (2)1×10~(-4)MTTA-2×10~(-2)MTOPO己烷溶液。 (3)O.2MTTA苯溶液。     

XRF/EDTA滴定法测定钐铕钆富集物样品稀土总量

采用X射线荧光光谱(XRF)法测定钐铕钆富集物的平均摩尔质量;用EDTA滴定法测定钐铕钆富集物中的稀土总量。方法的标准偏差为0．13％,相对标准偏差为0．14％,所得结果与重量法结果基本一致。     

钐,铕—四环素类抗生素络合物荧光性能的研究及其在荧光分析中的应用

本文探讨了钐、铕－四环素、强力霉素、土霉素、金霉素络合物的荧光性能及利用该体体系以荧光分析光度法测定痕量钐和铕的可能性与最佳测定条件。结果表明：在高碱度条件下，以四环素体系的稳定性、灵敏性最好，钐和铕的检测限分别为３８．２和０．０９ｎｇ／ｍＬ。     

TTA-phen-吐温80胶束增溶体系荧光分析法测定痕量钐和铕

2-噻吩甲酰三氟丙酮(TTA)和诸如三正辛基氧化膦(TOPO)、邻菲罗啉(phen)等中性附加配位体所组成的协同萃取体系已应用于荧光分析法测定钐和铕,该体系选择性、灵敏度均颇高,适用于岩石、矿物、生物体的分析,但需使用有机溶剂。竹田津等将非离子表面活性剂用于荧光分析,免去了有机溶剂萃取操作,方法简便,如:TTA-TOPO-TritonX-100体系荧光法测定钐、铕,PTA(三氟乙酰特戊酰甲烷)-TOPO-BL-9EX体系荧光法测定钐、铕、铽等。本文使用phen代替TOPO,以非离子表面活性剂吐温80为增溶剂,研究了TTA-phen-吐温80体系荧光法测定钐和铕的最佳条件、干扰离子影响及回收率,均取得较为满意的结果。     

时间分辨激光荧光光度法测定超痕量的铕和钐

在Trition-X100的水溶液中,噻吩甲酰三氟丙酮(TTA)和三辛基氧膦(TOPO)存在下,用时间分辫激光荧光光度法,研究了痕量铕和钐的测定条件。试验还测定了氧化钆中的铕和钐,铕和钐的测定限量分别为6ppt和30ppt,检测下限分别为0.27ppt和10ppt。试验还测得了铕(或钐)与TTA、TOPO三元络合物的组成。     

关于影响镧、钐与铕测定灵敏度原因的探讨

实验证明，在石墨表面上原子化时，镧、钐或铕与炽热的石墨反应生成难解离的碳化物是导致镧、钐和铕测定灵敏度低与严重记忆效应的原因。用钽探针原子化测定钐样品时，钐物种与钽氧化物之间发生反应，生成复合物SmTaO4、镶嵌于钽探针表面的裂痕内，阻碍了钐原子化，导致测定钐的灵敏度下降。     

铁-邻二氮菲-曙红离子缔合物显色反应的研究及应用

研究了在聚乙烯醇-乳化剂OP混合增溶剂存在下,Fe(Ⅲ)-邻二氮菲-曙红离子缔合物的显色反应。提出一种测定Fe(Ⅲ)的新方法,并将其应用于高纯稀土钐、铕、钆中痕量铁的测定。离子缔合物的最大吸收波长为55lnm,表观摩尔吸光系数ε551＝5．4×104。在测定条件下,铁含量在0～8μg／25ml符合比耳定律。     

关于影响,钐与铕测定灵敏度原因的探讨

实验证明，在石墨表面上原子化时，镧、钐或铕与炽热的石墨反应生成难解离的碳化物是导致镧、钐和铕测定灵敏度低与严重记忆效应的原因。     

(Eu)Tb-TFA-TOPO-NSF络合物荧光性能的研究

有机溶剂萃取钐、铕、铽与β-二酮、中性配体三元络合物荧光法测定钐、铕、铽已有报道;而在表面活性剂存在下,直接测定水相荧光的研究仍不多。为此,研究了乳     

稀土离子对钐-铕-噻酚甲酰三氟丙酮-三正辛基膦化氧己烷萃取体系纸上荧光的增敏作用及其应用

在Sm3 + 、Eu3 + 噻酚甲酰三氟丙酮 三正辛基膦化氧己烷萃取体系中Y3 + 、La3 + 、Gd3 + 、Tb3 + 、Dy3 + 、Lu3 + 等离子可增强Sm3 + 、Eu3 + 的纸上荧光 ,其中以Tb3 + 的增敏效应最强 ,灵敏度提高了 6倍。将滤纸适当处理后可使Sm3 + 、Eu3 + 的检出限分别达到 0 .15和 0 .0 0 7ng。本法用于混合稀土氧化物中 0 .xng级的Sm3 + 和0 0 0xng级Eu3 + 的同时测定 ,结果满意     

Co-fluorescence of europium and samarium in time-resolved fluorimetric immunoassays.

In the presence of an excess of Y3+, the fluorescence intensities of Eu3+ and Sm3+, chelated with benzoyltrifluoroacetone (BTA) or thenoyltrifluoroacetone (TTA) in an aqueous solution containing 1,10-phenanthroline, were increased by factors ranging from 209- to 811-fold. This co-fluorescence phenomenon was used in a highly sensitive time-resolved fluorimetric detection of the lanthanides, Eu3+ and Sm3+. The detection limits of Eu3+ in the BTA- and TTA-based solutions were 4 and 15 fmol dm-3, respectively. The detection limits of Sm3+ were 0.11 and 0.12 pmol dm-3, respectively. The co-fluorescence enhancement systems were also applied in the double-label time-resolved fluorimetric immunoassay of luteinizing hormone and follicle stimulating hormone using specific antibodies labelled either with Eu3+ or Sm3+. The co-fluorescence enhancement solution was superior as compared with the commercial 'direct' fluorescence enhancement solution based on the acidic solution of beta-naphthoyltrifluoroacetone, trioctylphosphine oxide and Triton X-100, in respect to the signal level obtained and the sensitivity. It is suited to time-resolved fluorimetric immunoassays in which particularly high detection sensitivities are required, and it can also be used in double-label assays employing Eu3+ and Sm3+ chelate labels.     

Synthesis of (La0.8Y0.2)PO4: Sm3+, Eu3+, Na+ and kinetics mechanism study with Z(α) master plots method for thermal process of its precursor

Journal of Thermal Analysis and Calorimetry - Because luminescence can be enhanced by energy transfer from Sm3+ to Eu3+ ions, Eu3+, Sm3+-codoped phosphors have attracted much attention recently. In...     

Enhanced red light emission from LaBSiO5:Eu3+,R3+ (R=Bi or Sm) phosphors

Polycrystalline LaBSiO5:Eu3+,R3+ (R=Bi or Sm) phosphors have been synthesized by a facile sol-gel method. The phosphors have been characterized by thermogravimetric analysis/different scanning calorimeter, scanning electron microscopy, X-ray diffractometer and fluorescence measurements. It was found that the emission intensity of LaBSiO5:Eu phosphors increases clearly and reaches a maximum at 30 mol% with increasing of Eu3+ concentration. The incorporation of Bi3+ ions and/or Sm3+ ions have greatly enhanced the emission intensity of Eu3+ upon excitation with 391 nm light. The possible sensitization mechanisms of Sm3+ and/or Bi3+ on Eu3+ emission intensity have been investigated and discussed. The high brightness and short luminescence decay times make it promising red-emitting candidates for white light-emitting diodes.     

[（n—C4H9）4N][EuxM1—x（TTA）4]（M=La、Sm、Gd、Tb）的光致发光

合成了一类组成为[(n-C4H9)4N][EuxM1-x(TTA)4](M=La、Sm、Gd、Tb）的固体配合物，通过测定其红外光谱，X射线粉末衍射谱和荧光光谱，研究了配合物结构和发光性质随Eu^3 浓度变化的规律。红外光谱和XRD谱的分析结果表明，在体系中没有新化合物生成，而荧光光谱分析结果表明发光强度与Eu^3 浓度不成线性关系，不发光的基质配合物组分对发光有不同大小和不同类型的影响，提出一种可能的发光机制解释这一共发光现象。     

Studies on monoxide emission spectrometry of rare-earth elements. IV. Simultaneous determination of Sm, Eu, Gd in Sm---Eu---Gd concentrates by the dual wavelength method

This paper reports the determination of samarium, europium and gadolinium by Sm and Gd monoxide emission and Eu atomic emission. The enhancement effect of other rare earth elements on Sm, Eu and Gd emission was studied. Large amounts of lanthanum (La) were used as enhancing reagents and chemical interference inhibitors and the dual wavelength method was introduced to eliminate spectral interference, in which the analytical wavelengths used were Sm 651.0 nm, Eu 459.4 nm and Gd 461.6 nm and the reference wavelengths were Sm 651.4 nm, Eu 459.8 nm and Gd 461.2 nm. The method has been applied to the assay of Sm, Eu and Gd in synthetic Sm---Eu---Gd concentrates with satisfactory results.     

ICP—MS法测定土壤中十五种稀土元素

采用微波消化土壤样品,通过优化等离子体功率、雾化器流量等仪器参数,找出最佳的测定条件,直接测定了土壤中Y、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu15种稀土元素含量。结果表明,各个元素的方法检出限为0．004—0．024ng／mL,样品的检出下限为0．09—0．30ng／mL,结果较为满意。     

稀土－铌(钽)复合溴氧化物的结构与光谱特性

用高温固相法合成了系列化合物RE_0.06La_0.94M₂O₆Br(M=Nb,Ta;RE=Eu,Tb,Pr,Sm),并测定了其激发和发射光谱,室温下Eu³⁺、Tb³⁺、Pr³⁺、Sm³⁺在稀土-铌(钽)复合溴氧化物中呈现特征激发谱线,但Nb和Ta的光谱特性稍有不同。     

协同发光效应及其分析应用研究

在研究共存元素对钐、铕、铽和镝配合物荧光发射的影响时,人们曾分别观察到这些配合物的荧光强度不但不随某些共存稀土和非稀土离子浓度的增加而降低;而是在一定浓度范围内随共存离子浓度的增加,配合物的荧光发射大大增强,利用这种效应可大大提高这类配合物的荧光分析灵敏度,我们采用自己组装的激光诱导荧光光谱测定装置,选取铕(钐)-     

Systematic behavior of charge-transfer transitions and energy level variation in soft donor complexes of the trivalent lanthanides

The systematic behavior of the charge-transfer (CT) energies in mixed 2,2'-bipyridyl (bipy), N,N-diethyldithiocarbamate (Et2dtc-) complexes of the trivalent lanthanides, Ln(Et2dtc)3(bipy), is investigated to understand the electronic structure of f-element complexes containing soft donor ligands. The energies of ligand to Ln3+ CT are extremely low in this system, an effect attributed to the presence of the soft donor ligands. The lowest CT energy level for the Sm3+, Eu3+, and Yb3+ complexes falls into the visible range. In Eu(Et2dtc)(bipy), the Eu3+ ion becomes nonluminescent because the CT energy stretches below the metastable 5D0 electronic state, whereas luminescence from the CT state and the 4f13 (2)F(5/2) state are observed in the Yb compound. The variation in the energy of the lowest level CT transition for the entire Ln(Et2dtc)3(bipy) series has been evaluated using the experimentally determined CT levels of the Sm3+, Eu3+, and Yb3+ compounds based on the systematic behavior of the lanthanides, which is invariant with respect to the type of ligand. The energy difference between the ground electronic states of the lanthanide ions and the ligand-centered valence band may also be calculated from these results.