滴水珠中总生物碱和微量元素的含量测定

采用酸性染料比色法测定了滴水珠中总生物碱的含量 ,采用等离子体发射光谱法测定了其微量元素的含量。结果表明滴水珠中总生物碱的含量为 0 65 3 1 % ;含有Cu、Mn、Zn、Fe、Co、Cd、Cr等多种微量元素 ,其中Fe的含量最高 ,为 1 3 4 80 0× 1 0 - 6 。     

绿茶和红茶中微量元素初级形态含量的研究

本文采用沸水浸泡法对茶叶的初级形态进行分离 ,原子吸收光谱法测定了绿茶和红茶初级形态中 8种微量元素含量 ,计算并讨论了微量元素初级形态分析参数 ,获得茶叶中微量元素初级形态的有关信息。结果表明 ,绿茶和红茶中 8种微量元素初级形态含量各有差异 ,初级形态分析参数自符合程度为87.2 0 %— 10 3.73% ,样品的回收率为 87.1%— 10 2 %。     

Direct determination of Hg in polymers by solid sampling-graphite furnace atomic absorption spectrometry : A comparison of the performance of line source and continuum source instrumentation

This work explores the potential of solid sampling-graphite furnace atomic absorption spectrometry (SS-GFAAS) for the fast and direct determination of Hg in polymers. Eight certified reference materials with different composition (polyethylene-PE-, polystyrene-PS-, poly vinyl chloride-PVC- and acrylonitrile butadiene styrene-ABS-) were selected for the study, covering a wide Hg content range (from 20 to 1100 μg g^− 1).     

原子吸收光谱法测定首饰镍释放量的不确定度评定

通过对原子吸收光谱法（AAS）测定首饰中镍释放量不确定度的评定,建立了该分析过程的相应数学模型,对数学模型中各个参数进行不确定度来源分析。研究结果表明:配制标准液以及标准工作曲线拟合线性方程是不确定度的主要来源。通过计算,首饰中镍释放量的合成标准不确定度为3.02×10-3,当包含因子k=2,置信水平为95%时,扩展不确定度为 6.04×10-3 μg/(cm2·week）。     

铜质水嘴中铅含量与析出量的相关性探讨

试验探讨铜质水嘴中铅含量与析出量的关系。对一系列含铅标准铜片按照GB/T 17219–1998《生活饮用水输配水设备及防护材料的安全性评价标准》要求进行浸泡试验,使用原子吸收光谱法或电感耦合等离子体质谱法检测浸泡液中的铅含量,再利用20个已知铅含量的铜质水嘴样品进行析出量的检测和验证。得到铜质水嘴中铅含量与析出量的关系。试验结果表明:大部分内腔有电镀层的铜质水嘴,铅析出量小于5.0μg/L;内腔无电镀层的铜质水嘴中铅含量小于0.5%时,铅析出量小于5.0μg/L,符合GB/T 17219–1998标准要求。     

AAS测定紫皮石斛中5种重金属元素的含量

对天然紫皮石斛(Dendrobium devoninum Paxt.)根和茎中Cr、Cd、Pb、Hg、Cu 5种重金属元素的含量进行了测定,旨在为该资源的药(食)利用提供基础数据.利用干法灰化处理样品,采用原子吸收光谱法(AAS)分别测定紫皮石斛根和茎中Cr、Cd、Pb、Hg、Cu 5种重金属元素的含量.根中Cr、Hg和Cu 3种元素含量分别为122.8043士39.02、311.5152士24.28、0.2890士0.19mg·kg-1,相对标准偏差(RSD)在3.20％-14.07％之间;茎中Cr、Hg和Cu 3种元素的含量分别为139.3997士14.72、276.0101士45.61、0.2854士0.29mg·kg-1,相对标准偏差(RSD)在4.83％-10.99％之间;根和茎中均未检出Cd、Pb两种元素,可能与地球化学背景有关.与人工种植石斛中重金属元素含量相比,Cr、Hg两种元素含量相对较高,Cu元素含量较低.本法操作简便,重复性好,测定结果满意.     

同一种前处理方法测定烟草中砷、铅和镉

采用同一种前处理方法即硝酸和高氯酸消解处理烟草样品后,氢化物发生-原子荧光光谱法测定烟叶中砷、铅;原子吸收光谱法测定烟叶中镉。样品溶液介质为10%的盐酸,对7个样品平行3次重复实验,其相对标准偏差为砷:0.81%—4.96%、铅:2.82%—5.83%、镉:0.96%—4.60%,砷、铅、镉的检测线性范围分别为:0.0—120.0、0.0—60.Oμg·L^-1和0.0—800.0μg·L^-1,加标回收率:砷在94.5%—96.9%之间、铅在92.7%—101.6%之间、镉在102.2%—110.9%之间。     

On Atomization of Calcium,Magnesium and Antimony from ThO2 Matrix by Atomic Absorption Spectrometric Techniques

ABSTRACT

Atomic Absorption Spectrometric methods (AAS) developed for the direct determination of Ca and Mg using flame-AAS technique have linear ranges of 0.1-2.0 μg/ml and 0.025-0.4 μg/ml with thorium concentrations optimized at 2.5 and 0.5 mg/ml, respectively, while the analytical range obtained for Sb using electrothermal-AAS technique is 0.002-0.1 μg/ml with Th sample aliquot of 2.5 mg/ml. The precision of determinations for both the techniques as evaluated from analyses of synthetic samples is 5% RSD or better. Probable mechanism for atom formation for Sb has been discussed in detail. In addition, role of chemical modifiers in enhancing the analyte signal has also been discussed.     

Determination of Trace Copper in Cord Blood Serum from New Born Infants by Flameless AAS with Aerosol Deposition Technique

Abstract

This paper discusses the appropriate conditions for determining trace cooper by flameless atomic absorption spectrophotometry with the aerosol deposition technique. Seventeen samples of cord blood serum from the new born infants in the Hefei district of China were analyzed by this method. The range of trace copper in the samples is between 0.40-0.77 ppm, mean value 0.55 ppm. The recovery is over 90%. The relative standard deviation is 2.8%, determined by measurement of six times on a certain serum sample.     

Determination of Thallium In Solid Environmental Samples By Electrothermal Atomic Absorption Spectrometry

Abstract

A method for the determination of thallium in solid environmental samples is developed. After destruction of the sample, TI(III) is extracted from 0.5 M hydrobromic acid solution into diisopropyl-ether. the organic phase is evaporated and the residue taken up in a mixture of sulfuric and nitric acids. Measurements are carried out with an atomic absorption spectrometer with Zeeman background corrector. the accuracy of the method is tested by analysis of certified reference materials and the method is applied to fly ash and emitted particulate matter from a municipal refuse incinerator and to soil samples.