HG-AFS测定铅-锑合金中的硒

建立氢化物发生-原子荧光光谱法测定铅-锑合金中硒的分析方法。试样经33%硝酸和酒石酸溶解,硫酸沉淀分离基体铅元素,在40%盐酸介质中直接测定样品中的硒。考察了测定的最佳条件、铅及共存元素对测定的影响。两个标样的方法相对标准偏差为分别为6.52%—9.34%。准确度和精密度均能满足分析需要,具有较强的实用性。     

氢化物发生-原子荧光光谱法测定食盐中Pb

盐酸处理食盐试样 ,氢化物发生 -原子荧光光谱法直接测定食盐中铅含量 ,试验了不同的酸及酸度对测定的影响。方法的检出限为 9.92 ng/ g,回收率为 95 .1 %— 1 0 5 .3% ,相对标准偏差为 4 .1 4 %。方法操作简便、快速 ,适用于食盐中铅的测定     

新疆孕马结合雌激素原料药中铅、镉、砷、汞、铜含量测定

建立了测定孕马结合雌激素（CE）原料药中铅、镉、砷、汞、铜残留量的方法。采用石墨炉原子吸收光谱法（AAS）测定铅、镉、铜含量;原子荧光光谱法（AFS）测定砷、汞含量。铅、镉、砷、汞、铜的回收率（n=6）分别为93.4%,98.2%,102.8%,95.0%,96.4%。该方法操作简便,快速,可用于原料药中铅、镉、砷、汞、铜重金属残留量的测定。     

氢化物发生-原子荧光光谱法测定茶叶中的铅

氢化物发生-原子荧光光谱法测定茶叶中铅,在优化的分析条件下,相对标准偏差0.68%,回收率104%,用于标准样品(GBW08505)测定,结果与标准值吻合。该方法用于实际样品测定,与石墨炉原子吸收法对比,结果令人满意。     

氢化物发生-原子荧光光谱法测定酱油中的铅

采用硝酸-高氯酸消解,氢化物发生-原子荧光光谱法测定酱油中铅,线性检测范围:0-200ng/mL,方法检出限:0.0991ng/mL,加标回收率:94.347%-98.033%.     

氢化物发生-原子荧光光谱法测定化妆品中的硒

硒是化妆品中的限用物质.应用氢化物发生-原子荧光光谱法测定化妆品中痕量的硒,样品用硝酸和高氯酸消解,盐酸可以使硒(Ⅵ)还原成硒(Ⅳ),硒(Ⅳ)与硼氢化钾反应产生硒化氢,硒化氢被带到原子化器,在最佳的条件下用原子荧光检测.这种方法测定化妆品中的硒,样品处理简单快速,方法的线性范围宽(0-20 μg/L),基体干扰少,检出限低(0.081 μg/L),加标回收率在96.05%-101.96%之间,相对标准偏差2.74%-2.99%.     

流动注射-氢化物原子荧光光谱法直接测定海水中的铅

提出了以碱性铁氰化钾为氧化剂的铅氢化物体系。采用硝酸作为介质,对原子荧光光谱法测定海水中的铅的条件进行了系统研究。在最佳的测试条件下,测得铅的检出限为0.48μg/L,相对标准偏差为2.4%(n=11)。对海水样品进行了分析,回收率为96.5%—107%。该方法应用于海水样品的分析,取得了令人满意的结果。     

消化-石油醚提取氢化物-原子荧光光谱法测定食用油中砷

采用消化 -石油醚提取方法处理食用调味油样品 ,以氢化物 -原子荧光光谱法测定砷 ,研究了样品的处理方法、线性关系及检出限 ,建立了快速测定食用调味油中砷含量的原子荧光光谱法。相对标准偏差小于1.79% ,加标回收率 96 .7%— 10 3.8%。     

微波消化-氢化物原子荧光法测定水产品中的铅

采用微波消化技术溶解水产品,以氢化物－原子荧光法测定铅,讨论并确定了最佳测定条件,结果表明,铅的测定线性范围为0－100ng/mL,方法的相对标准偏差为1．2％－5．3％,回收率为94．8％－103．5％。该方法简便、快速,用于水产品中铅的测定,获得令人满意的结果。     

氢化物发生-原子荧光光谱法测定海水中的铅

氢化物发生-原子荧光光谱法测定海水中铅,优化了酸度、硼氢化钾和基体改进剂浓度、载气流量、灯电流以及原子化器高度等分析条件,在0—80ng/mL内呈线性关系,相关系数为0.999,测量精确度为3%,准确度为101%,回收率达到了95.0%—97.5%。此法具有操作简单、快速、基体干扰少、灵敏度高、重现性好、线性范围宽、结果可靠等优点,适用于海水中铅元素的测定。     

微量悬浮液进样-火焰原子吸收光谱法测定霜类化妆品中的铅

基于悬浮液技术处理霜类化妆品样品,将样品悬浮在1.00g/L琼脂溶液中制成均匀的悬浮液,采用微量进样技术建立了火焰原子吸收光谱法快速测定霜类化妆品中的铅。方法的检出限为0.030μg/mL,回收率为98.8%—101.5%。方法应用于实际样品的测定,结果满意。     

超声波辅助浸提-冷原子吸收光谱法测定化妆品中的汞

建立了超声波辅助浸提-冷原子吸收光谱法测定化妆品中汞的方法,对样品前处理方法、样品取样量、盐酸羟胺、正辛醇及其他共存金属离子等影响因素进行了研究。该方法汞的检出限为0.012μg,加标回收率为87.5%—98.3%,该方法与国标方法对照,缩短了样品前处理时间且结果无显著性差异,为化妆品中汞的检测与质量控制提供了一种快速、准确的分析方法。     

原子荧光光谱法测定化妆品中汞的结果不确定度评定

本文介绍了原子荧光光谱法测定化妆品中汞的不确定度评定方法 ,分析和识别在分析过程中的不确定度来源 ,较为全面地评定了测量不确定度。根据最小二乘法原理计算校准曲线的标准不确定度 ,采用极差法评定测量次数较少时引起的标准不确定度。对原子吸收法、电感耦合等离子体 -原子发射光谱法和原子荧光光谱法等测定结果的不确定度的评定具有参考作用。     

Atomic Spectrum in Ramsey Separated Oscillating Fields with Three Interaction Regions

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Atomic Spectrum in Ramsey Separated Oscillating Fields with Three Interaction Regions

Comparing with the situation of Ramsey separated oscillating fields used in Cesium atomic beam frequency standard, the transition probability spectrum of two-level atoms in the Ramsey separated oscillating fields with three interaction regions has been derived under the condition of near resonance. The new characteristic of atomic spectrum with excessive microwave power was analyzed in detail. Meantime, the predicted new characteristic of atomic spectrum was confirmed by numerical method in this paper.     

电感耦合等离子体原子发射光谱法测定化妆品中砷、铅、汞

本文采用五氧化二钒作催化剂，HNO3－H2SO4消解法对化妆品前处理后，用电感耦合等离子体发射光谱仪同时测定砷，铅，汞，方法简便，快速，回收率在95％－103．5％之间，相对标准偏差不大于3％。     

Study of the frequency distribution of the fluorescent light induced by monochromatic radiation

The frequency distribution of the fluorescent light induced by monochromatic dye laser radiation was investigated. To exclude the influence of the Doppler width a strongly collimated atomic beam was used. The spectrum was measured by means of a piezoelectrically tunable spherical Fabry Perot. The interaction region between the laser light and the atomic beam was placed into the center of the interferometer. Thus the observed fluorescence spectrum was considerably more intense than in the case where the interferometer is used separately from the beam. The fluorescence spectrum was observed for different directions of polarization of the incident laser beam. In the case of weak excitation the spectrum consists of a sharp component essentially due to elastically scattered light. At high intensities a structure of three components is observed which is in agreement with theoretical predictions when circularly polarized light is used for excitation.     

Atomic dynamics of lead embedded into nanoporous glass

The thermal atomic vibration spectrum of lead nanostructured in porous glass with an average pore size of 7 nm and the thermal vibration spectrum of conventional bulk lead (taken for comparison) are measured using inelastic neutron scattering. The density of states in the phonon spectrum of lead nanoparticles is found to exceed the density of states in the spectrum of bulk lead at both low (E < 2.5 meV) and high (E > 9.5 meV) energies. These data are used to propose a model for the structure of a porous glass-lead nano-composite.     

Study of the frequency distribution of the fluorescent light induced by monochromatic radiation

The frequency distribution of the fluorescent light induced by monochromatic dye laser radiation was investigated. To exclude the influence of the Doppler width a strongly collimated atomic beam was used. The spectrum was measured by means of a piezoelectrically tunable spherical Fabry Perot. The interaction region between the laser light and the atomic beam was placed into the center of the interferometer. Thus the observed fluorescence spectrum was considerably more intense than in the case where the interferometer is used separately from the beam. The fluorescence spectrum was observed for different directions of polarization of the incident laser beam. In the case of weak excitation the spectrum consists of a sharp component essentially due to elastically scattered light. At high intensities a structure of three components is observed which is in agreement with theoretical predictions when circularly polarized light is used for excitation.     

Nd：YAG单晶光纤光学特性研究

本文测量了用激光加热基座法拉制的Nd:YAG单晶光纤(具有块状晶体)的吸收谱线,荧光谱线等光谱学特性.根据测得的散射特性分析了用该法拉制的单晶光纤的生长缺陷和直径波动及其与单晶光纤质量的关系.