原子吸收光谱法测定尿中钙的含量

本文介绍了以原子吸收光谱法,直接测定尿中钙的含量。本方法不仅具有快速,简便等特点,而且采用了氯化锶做释放剂,并有效的消除了共存元素的干扰,回收率为９９．６％￣１０４．２％。     

离子交换-间接原子吸收法测定邻苯二酚

研究了在pH=9-10的碱性介质中邻苯二酚和铁（Ⅲ）反应生成的暗红色阴离子络合物,此络合物与强碱性阴离子树脂发生离子交换,并与过量的铁离子分离,利用原子吸收法测定过量的铁离子,从而达到测定邻苯二酚的目的。本方法线性范围为0－100mg/L,检出限为0.1mg/L,回收率为94．5％－102％,结果令人满意。     

激光烧蚀-双光束二极管激光原子吸收光谱法测定固体样品中的铀同位素比

以两个二极管激光作为光源 ,采用激光烧蚀 双光束二极管激光原子吸收光谱法测定了2 3 5U/ 2 3 8U同位素比。实验对用于样品烧蚀的Nd :YAG激光聚焦点位置进行了优化 ,在同时满足一定原子化程度和较高2 3 5U 6 82 6 736nm信背比的原则下 ,选择了聚焦点位置低于样品表面 0 4cm作为分析条件。测量2 3 5U/ 2 3 8U同位素比的精密度和准确度分别为 5 %和 2 % ,2 3 5U检测限为 18μg·g-1。结果表明 ,双光束检测法能消除激光烧蚀脉冲间信号波动对测量重现性的影响 ,比早先报道的单光束检测法在精密度和准确度上有了很大的改善     

Acid Interferences in Indirect Determination of Silicon bt Atomic Absorption Spectroscopy (AAS)

Although silicon may be determined directly by AAS using a nitrous oxide - acetylene flame, there have been reported procedures for its indirect determination based on interference with other elements, mostly strontium, magnesium, calcium and barium.     

Evaluation of Water Removal and Memory Effect in 13CO2 Breath Tests by Isotope Ratio Mass Spectrometry

The usefulness of different ways of water removal in off-line sample preparation of human breath samples for ¹³CO₂ breath tests was examined and compared. Cryogenic water trapping and water removal with common desiccants like silicagel blue, Mg(ClO₄)₂, and molecular sieves were checked for reliability and reproducibility. With silicagel blue and Mg(ClO₄)₂ memory effects for ¹³C content were observed. The use of molecular sieve 4 Å and 5 Å led to tremendous carbon isotope fractionation. Molecular sieve 3 Å was found to be an excellent alternative to the established use of Mg(ClO₄)₂ and of cryogenic water trapping.     

原子吸收光谱法测定皖景天吸收镉和锌的研究

通过原子吸收光谱法研究了皖景天对镉和锌的吸收特性,结果表明:皖景天对镉和锌的吸收量随时间的延长而增加,皖景天对镉吸收速率随时间的延长而降低,皖景天对锌吸收速率随时间的延长呈现先下降后上升的趋势。     

石墨炉原子吸收光谱法测定质子交换膜燃料电池(PEMFC)膜电极中铂含量

质子交换膜燃料电池膜电极中铂催化剂的含量对于电极的成本和性能是非常重要的,文章以石墨炉原子吸收光谱法测定了膜电极中铂的含量,探讨了石墨炉升温程序及实验方法的最佳工作条件。该方法准确、快速和简便。回收率在97.3%～101.2%之间,相对偏差小于2.67%。     

Determination of (13)CO(2)/(12)CO(2) Ratio by IRMS and NDIRS

Abstract Breath tests using (13)C-labelled substrates require the measurement of (13)CO(2)/(12)CO(2) ratio in breath gas samples. Next to isotope ratio mass spectrometry (IRMS), which is very sensitive but also complex and expensive, alternatively isotope selective nondispersive infrared spectrometry (NDIRS) can be used to determine the (13)CO(2)/(12)CO(2) ratio in expired breath. In this study we compared NDIRS- with IRMS-results to investigate whether the less expensive and very simply to operate NDIRS works as reliable as IRMS. For this purpose we applicated 1-(13)C-Phenylalanine to patients with advanced liver cirrhosis and healthy volunteers and took duplicated breath samples for IRMS and NDIRS at selected time points. Our data show a good correlation between these two methods for a small number of samples as required for simple breath tests. Longer series, where repeated measurements are required on the NDIRS instrument lead to a decreasing correlation. This indicates the superiority of IRMS concerning (13)CO(2)-kinetics over longer time periods.     

火焰原子吸收法测定牙膏中的锶

本文阐述了牙膏锶的测定方法，各种类型的牙膏成份较为复杂，宜采用标准加入法。获得满意的精密度，准确度。     

利用原子吸收技术(FAAS)对聚苯胺酚树脂除铁性能进行评价

采用铁的次灵敏线，利用火焰原子吸收分光光度法对聚苯胺酚树脂的除铁性能进行测试，其对高含量铁的测试结果与化学滴定法比较相一致，但操作简便、快速。     

原子吸收法测定加氢脱炔催化剂中的钯和铅

着重研究了空气－乙炔火焰原子吸收法测定钯和铅的介质影响条件，以及消除对钯干扰的释放剂和保护剂，拟定了采用酸浸溶不经分离直接测定的方法     

电热原子吸收光谱法测定奥沙利铂中的铅和砷

采用电热原子吸收光谱法测定抗肿瘤新药奥沙利铂中的痕量铅和砷,实验优选了灰化、原子化的最佳温度条件,进行了加标回收实验和精密度实验,加标回收率铅在97.88%—103.96%之间,砷在92.12%—105.72%之间。奥沙利铂是含贵金属的原料药,价格昂贵,检测时不耗费大量的样品、降低成本很重要。本法取样量少,不需要高温灰化和繁琐的样品富集和前处理技术,简单的酸溶解处理配成溶液后,即可直接上机测定,试样中的有机成分在灰化阶段可被除去。     

火焰原子吸收法测定海水中的铜和钴

本文用火焰原子吸收光谱法测定海水中的铜,钴,方法简单,快捷,具有良好的精密度和准确性。本法的相对标准偏差为Ｃｕ３．９％－５．０％,Ｃｏ１．６％－３．１％,回收率为Ｃｕ９３％￣１０３．５％,Ｃｏ９４．４％￣１０５％。     

火焰原子吸收光谱法测定烟草中的钙

研究了用火焰原子吸收光谱法测定烟草中微量钙的方法 ,确定了最佳测试条件 ;测定结果表明 ,校准曲线的线性测定范围为 1— 7μg· m L-1,线性相关系数 r=0 .9998;应用于样品测定 ,RSD为 0 .914 %—1.4 13% ,平均加标回收率为 99.5 % ,结果与偶氮胂 - 光度法一致 ;该法简便快速 ,准确可靠。     

富氧空气-乙炔火焰原子吸收光谱法测定钨

试样在2％磷酸介质中，加入0．5％过硫酸钾，在富氧空气－乙炔火焰的条件下用原子吸收光谱测定钨，可有效地抑制干扰，具有较高的原子化效率，方法的检出限为0．23μg/mL，灵敏度为2．4μg/mL。     

火焰原子吸收法测定食用仙人掌中微量元素含量

用灰化法溶解试样,配制混合标准系列溶液,加入LaCl₃和CsCl消除相关干扰,采用空气-乙炔火焰原子吸收法在同一试液中测定10种微量元素含量。建立了优化的仪器测定条件,方法简便、准确。结果表明,食用仙人掌中含Mg,K,Ca 为13～47 mg.g-1;Zn,Mn,Fe,Na为108～243 μg.g-1, Cu为34.8 μg.g-1;Ni和Sr为9.8～11.7 μg.g-1,其中Mg,K,Ca,Zn,Mn,Fe,Na,Cu的含量均显著高于胡萝卜中含量。     

富氧空气-乙炔火焰原子吸收光谱法测定钡

于试样溶液中加入0．25％镧和0．5％氯化钾，在富氧空气－乙炔火焰的条件下，可有效地降低干扰及电离效应，具有较高的原子化效率，方法的检出限为0．001μg/mL，灵敏度为0．12μg/mL，可用于矿泉水中钡的测定。     

Trace Metals Analysis of Legal and Counterfeit Cigarette Tobacco Samples Using Inductively Coupled Plasma Mass Spectrometry and Cold Vapor Atomic Absorption Spectrometry

ABSTRACT

A closed-vessel microwave-digestion method was developed for the determination of trace amounts of Be, V, Cr, Mn, Co, Ni, Cu, Zn, As, Se, Mo, Cd, Sb, Ba, Tl, and Pb by inductively coupled plasma mass spectrometry and Hg by cold-vapor atomic absorption spectrometry in cigarette tobacco samples. In order to gauge the effectiveness of the digestion procedure, recovery studies were conducted using solutions prepared from National Institute of Standards and Technology Standard Reference Material 1573a Trace Elements in Tomato Leaves and Polish Certified Reference Material Virginia Tobacco Leaves. Limits of detection were below 1 µg g^?1 for all elements studied. Samples from two genuine-brand and three counterfeit packs were analyzed. The mean amounts of Be, As, Mo, Cd, Sb, Tl, Pb, and Hg were higher in counterfeit cigarettes, while the amounts of V, Cr, Mn, Co, Cu, Zn, Se, and Ba were comparable among legal and counterfeit cigarettes; the amount of Ni was higher in the legal cigarettes. Evaluation of Be, As, Mo, Cd, Sb, Tl, Pb, and Hg with their potential hazards for smokers is briefly discussed.     

原子吸收光谱法测定脑血管病患者脑脊液中微量元素

采用原子吸收光谱法对脑梗塞脑出血患者和正常人脑脊液不经消化,直接测定了微量元素Zn,Cu,Fe,Cd含量。该方法的加标回收率为97.6%～104.8%,相对标准偏差(RSD)小于5%。患者脑脊液中Cu含量较正常人低,Zn,Fe,Cd的含量均比正常人明显升高。该测定结果为研究其微量元素含量与脑血管疾病的相关关系以及该疾病的诊断、治疗和预防提供了有用的数据。     

用原子吸收法测定大气颗粒物中的金属元素 --用CA-CN型微孔滤膜采样

本文用０．２２μｍ孔径的微孔滤膜采集大气颗粒物中的铜,铅,锌,镉,锰,铁,镍,铬,并用原子吸收分光光度计测定。