活性艳蓝铋染料的合成及其光谱研究

本文以活性艳蓝和硝酸铋为原料，合成了活性艳蓝铋染料。对产物进行了铋含量的测定，测定了产物的可见光吸收光谱、红外光谱。     

阳离子金黄锑染料的合成及其光谱研究

本文以阳离子金黄三氯化锑为原料,合成了阳离子金黄染料,并对该产物进行了锑含量的测定,测定了产物的可见光吸收光谱和红外光谱。     

ICP—AES法直接测定铋矿石中铋

本文研究了用ＩＣＰ－ＡＥＳ法直接测定铋矿石中铋含量的方法，优化了仪器的测试条件，并对共存元素的干扰情况进行了研究，该方法简便，快速，可直接用于铋矿石中铋的准确测定，结果满意。     

高效液相色谱法测定枸橼酸铋雷尼替丁有效成分

用高效液相色谱法测定了枸橼酸铋雷尼替丁胶囊的含量,并与络合滴定法的测定结果进行了比较.该法简便、快速、结果准确,为枸橼酸铋雷尼替丁胶囊的质量控制提供了可靠依据.     

铋中微量锂的火焰光度测定

本文报告了用火焰分光光度法测定铋中微量锂的高灵敏度方法。基体铋用碱式硝酸铋形式水解分离。测定下限为0.1微克/克。     

流动注射-氢化物发生-原子吸收光谱法测定果胶铋

本文采用流动注射 氢化物发生 原子吸收光谱法测定了果胶铋中铋的含量 ,方法简单、快速、准确 ,考察了实验参数对测定果胶铋中铋的影响。线性范围为 0 0 0～ 4 4 0 0ng·mL- 1 ,工作曲线回归方程为A =0 0 12 +0 0 17c(c:ng·mL- 1 ) ,相关系数r=0 9995 ,检测限为 0 0 95ng·mL- 1 ,回收率在 97 3%～ 10 3 3% ,用于实际样品的分析结果满意。     

氢化物-原子吸收光谱法测定地球化学样品中的砷、锑、铋

氢化物-原子吸收光谱法是测定砷、锑、铋等元素的一种快速、灵敏、准确的方法,国内外已有不少报导。但是对共存元素的干扰研究较少,难于直接用于组成复杂的地质样品分析。为了适应大批地球化学样品中砷、锑、铋的分析,本文较详细地研究了用氢化物-原子吸收光谱法在同一份溶液中连续测定砷、锑、铋的仪器工作条件、氢化物发生条件及共存元素的干扰。选出了对砷、锑、铋均为有效的还原抑制剂。在选定的条     

悬浮液氢化物发生原子荧光光谱法测定化探样品中痕量铋

本文提出了一种把悬浮液技术与氢化物发生法相结合原子荧光光谱测定化探样品中痕量铋的分析方法，试验了悬浮粒度，酸介质，悬浮液浓度等因素对铋氢化物发生效率的影响，采用水溶液标准校正，方法简便，结果准确可靠。     

氢化物发生-原子荧光法测定中草药中的痕量铋

研究了氢化物发生-原子荧光法测定中草药中痕量铋的适宜条件, 试验了不同的消解方式、酸介质和还原剂的用量对测定铋的影响。在最佳测定条件下, 铋的线性范围为0.1～200 μg·L-1, 检出限为0.094 6 μg·L-1。仪器的相对标准偏差为0.55%, 加标回收率为94%～107%。结果表明本法具有快速、简便和准确等特点。     

抑制高碘酸钾氧化结晶紫分光光度法测定痕量铋(Ⅲ)

研究发现.在体系自身酸度条件下(pH=6.5),0.05mol/L高碘酸钾能氧化结晶紫褪色,而痕量铋又能灵敏地抑制该反应.据此建立了抑制高碘酸钾氧化结晶紫分光光度法测定痕量铋(Ⅱ)的新方法,该方法的线性范围为0.002-o.05ng/mL,检出限为0.5pg/mL.本方法具有高灵敏度、选择性好、操作简便、反应快速等特点,并且用于人发和茶叶中痕量铋的测定,获得满意的结果.     

酸性金黄偶氮染料在银镜上的表面增强拉曼光谱研究

以银氨溶液和葡萄糖制备的银镜为吸附基底,获得了酸性金黄G偶氮染料在银镜上的表面增强拉曼光谱,并对其拉曼峰的归属及吸附机理进行了探讨。酸性金黄G靠静电引力和范德华力以带孤对电子的N原子垂直吸附在银镜表面,SERS强度随染料浓度的降低而降低,检出限为10-10mol/L。     

Absorption Spectra of Benzene Cation Radical,Chlorobenzene Cation Radical,and Fluorobenzene Cation Radical in Perfluorocarbon Polymer Film at 77K

Absorption spectra of benzene cation radical, chlorobenzene cation radical, and fluorobenzene cation radical have been obtained in perfluorocarbon polymer at 77 K. Cation radicals are formed in good yields and less perturbed electronic absorption spectra are obtained. Results demonstrate that perfluorocarbon polymer is suitable as matrix for spectroscopic investigation of the cation radicals formed by γ-irradiation.     

Outer-Sphere Interaction in Hexafluorocomplexes of Elements of Group IV with Cations of Alkali Metals and Ammonium

IR-absorption spectra of M²AF⁶hexafluorocomplexes (M-Na, K, Rb, Cs and NH⁴; A=Si, Ge, Sn) were obtained and intergrated intensities of bands assigned to stretching vibrations of AF⁶ ions were measured. The reasons for the influence of exchange of the central atom and an outer-sphere cation on the intergrated intessities of vibration bands are discussed. It was found that the ammonium ion does not fit into the earlier established pattern of intensity dependence on cation size. Analysis of the frequencies v³ (AF⁶) suggeste that this is coused by the presence in (NH⁴)²AF⁶ of hydrogen bonds N-H F of different strength.

The question of the influence of anther-sphere cation on the spectral properties of complex compounds has been treated in the literature ^1-6. The dependence of vibrational frequencies characterizing the anion ^1-3, the integrated intensity vibration bands (IIVB) in IR-absorption spectra ⁴, chemical shiftn in ¹⁹ f NMR apectra ² and the luminescent properties of complexed on cation nature have been established.     

Franck Condon Factors for the He(I) Photoelectron Spectrum of Methyl Radical

Computed Franck Condon factors pertinent to the photoelectron spectrum of methyl radical are discussed. The low frequency spacings in the observed spectra are assigned to transitions between the first and second (bending mode, v ₂′) excited states and thus correspond to differences in the bending frequencies of the cation and the radical. The high frequency spacing is assigned as 2v ₂′ of the cation. Any barrier to planarity of the radical is lower than the zero point energy of the bending mode.     

Effect of nonstoichiometry on the structure and dielectric properties of bismuth ferrite

Nonstoichiometric bismuth ferrite Bi _x FeO₃ 0.88 ≤ x ≤ 1.04) fabricated via solid-state synthesis is investigated by means of X-ray diffraction and electrical methods. The periodicity of the formation of impurity phases and variations in the structural parameters and densities of ceramic samples is established. The correlation between the number of impurity phases and characteristics of the dielectric spectra in the cation/anion-deficient (0.88 ≤ x < 1.00) and cation/anion-excess (1.00 < x ≤ 1.04) nonstoichiometry regions of Bi _x FeO₃ is confirmed. The observed effects are explained for the actual (defect) structure of bismuth ferrite.     

基于径向基神经网络和BP神经网络对日落黄荧光光谱的分析

对食用合成色素日落黄的荧光光谱进行研究,发现在最佳激发波长370nm紫外光的激励下,荧光峰值波位于576nm;经分析认为,日落黄溶液之所以能产生荧光是因为分子中偶氮键将一个苯环和一个萘环连接在一起,形成大共轭结构,并且取代基与—SO3Na与—OH处于萘环的对位,大大增强了日落黄分子的共轭程度,使其具有强的吸光功能,发出强荧光。另外,结合径向基神经网络和BP神经网络对未知样本进行浓度预测,结果精确,平均相对误差分别为3.51%和5.45%,RSD分别为1.83%和2.95%。该方法有望成为对食用合成色素进行高效检测的有效方法。     

火焰原子吸收光谱法测定金黄色玻璃中的铈

用不含铈的玻璃标样制作的溶液作基体,用N2O-C2H2火焰原子吸收法测定金黄色系列玻璃中的铈,在100mL溶液中,铈含量在O-1mg范围内与吸光度呈线性关系,符合比耳定律.本方法用于玻璃中微量铈的测定,结果满意.     

铋、氧化铋、硫化铋在硝酸-硫脲中的溶解性

研究了铋、氧化铋、硫化铋在硝酸-硫脲中的溶解性。三价铋离子与硫脲溶液可形成黄色络合物,在波长为460nm处,反应温度为25℃,反应时间为6min,硝酸浓度为1.0mol/L,硫脲浓度为0.5mol/L,振荡速率为160r/min条件下铋含量在0.059—4.57μg/mL范围内服从郎伯-比尔定律,检出限为m=0.04μg。铋矿物的溶解性顺序大小为Bi2O3>Bi>Bi₂S₃。本方法操作简便,可靠,实验结果满意,具有广泛的实用意义。