火焰原子吸收光谱法测定工业废水中铅

研究了利用十二烷基磺酸钠(SDS)的增感作用,火焰原子吸收光谱法测定工业废水中微量铅。考察了各试验参数及共存元素对铅测定的影响,探讨了SDS增感机理。方法用于工厂废水中铅的测定,测定结果的相对标准偏差为0.8%~1.2%,检出限为0.11 mg.L-1,加标回收率为94%~104%。     

FAAS测定妇炎康冲剂中的微量元素

测定妇炎康冲剂中多种微量元素的含量,为研究金属元素在妇炎康冲剂中的含量与药用功能提供有效的数据。采用空气-乙炔火焰原子吸收光谱法测定样品中微量元素的含量。样品中含有钙、镁、铁、硒,方法的加标回收率在98.4%—104.0%范围内,RSD(n=6)在1.0%—4.0%之间。镉、镍、铅未检出。妇炎康冲剂中含有钙、镁、铁、硒,值得进一步研究。     

两种败酱草金属元素含量的比较研究

采用火焰原子吸收光谱法测定黄花败酱和白花败酱中Fe、Cu、Zn、Mn、Mg、Ca的含量。该方法准确可靠,回收率为96.50%—107.50%,RSD为0.42%—1.38%。经比较,黄花败酱的铁、锰、钙含量远高于白花败酱,2种败酱草宜区别使用。     

红河州不同地区野山茶中微量元素的对比研究

研究了火焰原子吸收法连续测定野山茶中微量元素的工作条件,并以相同方法制备了红河州蒙自、石屏、弥勒等4个县市的野山茶实验样品,分别测定了此4个县市的野山茶样品中Pb, Cr, Cd, Cu等九种微量元素的含量,实验方法的相对标准偏差在0.07%～1.67%之间, 回收率在98.7%～116.4%之间。结果表明,对人体有害的元素Pb,Cd,Hg含量最高的是建水县野山茶样品,分别为53.47和6.03,7.68 μg·g-1。有益元素Mn在测定的元素中含量最高,平均含量高达913.48 μg·g-1;Fe作为半微量元素,其平均含量低于锰,为688.46 μg ·g-1;Zn的平均含量为116.64 μg·g-1。从实验样品中未能检测出Se。从实验结果得出,在红河州的野山茶中含有人体内必须的微量元素Mn,Fe,Zn等,野山茶具有一定的开发价值。     

僵蚕中金属元素的测定

收集不同来源的僵蚕药材,采用浓硝酸-高氯酸(4∶1,V/V)混合溶液消解僵蚕样品,用火焰原子吸收光谱法测定其中的Mn、Fe、Cu、Zn、Mg含量,共测定了6种僵蚕样品中的金属元素含量。僵蚕中金属元素含量为Mg>Fe>Zn>Mn>Cu。测定方法的回收率为94.4%—105.8%,相对标准偏差为0.25%—2.07%。僵蚕中含有较丰富的金属元素,其中Mg、Fe、Zn的含量较高。该方法快速、灵敏、准确。     

Online Preconcentration Using Surfactant Coated Alumina Modified with 1,5-Diphenylthiocarbazone and Determination of Cadmium in Environmental Samples by Flame Atomic Absorption Spectrometry

A rapid and sensitive method for the determination of trace levels of cadmium in cigarettes, soil, and blood samples by flame atomic absorption spectrometry (FAAS) has been developed. It is based on the online sorption of Cd(II) ions on a minicolumn packed by sodium dodecyl sulfate–coated alumina modified with dithizone. The optimum experimental parameters for the adsorption and desorption of cadmium were investigated. The recovery obtained was found to be 96% with preconcentration factor of 150. The calibration curve was linear between 50–600 µg/L Cd with a detection limit of 3 µg/L, sample frequency of 30 h^?1 and reuse of column for 10 times without loss of sensitivity. The accuracy of the method was confirmed by applying the standard addition method and quantitative recoveries (95–99%) were obtained.     

Characterization of Heavy Metal Air Pollution in Romania Using Moss Biomonitoring,Neutron Activation Analysis,and Atomic Absorption Spectrometry

ABSTRACT

Heavy metal air pollution in Romania was investigated by using passive moss biomonitoring. This study is a component of an international UNECE ICP Vegetation Program – moss survey. A total of 330 samples of Hypnum cupressiforme, Hylocomium splendens, Pleurozium schreberi, and other mosses were collected in Romania in the summer and autumn of 2010. The concentrations of aluminum, cadmium, chromium, copper, iron, lead, nickel, vanadium, and zinc were determined by graphite furnace/flame atomic absorption spectrometry and instrumental neutron activation analysis. The results were statistically processed to obtain spatial distribution maps of factor scores based on elemental concentrations in the moss, together with the spatial distribution maps of heavy metals in moss. The median concentrations of cadmium, 1.20?mg/kg dry weight, and lead, 30.8?mg/kg dry weight, were high compared with other European countries. The results revealed that the atmospheric deposition of these metals is a problem in north and northwest Romania.     

火焰原子吸收法测定翼梗五味子中微量元素的含量

目的：运用火焰原子吸收光谱法测定中草药翼梗五味子藤中的 Fe、 Zn、 Mg、 Ca、 Cu 5种微量元素的含量。方法用浓 HNO3-HClO4消解样品,采用标准曲线法测定其5种金属元素含量。结果所测的样品中含有丰富的人体必需微量元素, Ca 含量尤其丰富,高达15827μg/g。方法回收率在99．7％～105．0％之间,样品相对偏差小于5％。结论该法快速简便、重复性好、准确度好,适用于同类生物样品中微量元素的测定,结果令人满意。     

Determination of Silver in Human Hair by Ionic Liquid‐based Cold‐induced Aggregation Microextraction as a Solvent Extraction Method

We report on the determination of silver ion in human hair sample using ionic liquid cold‐induced aggregation combined with spectrophotometric detection. Parameters governing the extraction efficiency (such as concentration of ligand, volume of ionic liquid, pH, temperature, extraction time) were optimized and resulted in enrichment factor of 44.4 for silver ion. The calibration curve was linear with correlation coefficient (R²) of 0.999, in the concentration range from 1.0 to 20 ng mL^?1. The relative standard deviation is 2.3% (for n = 10), the limit of detection is 0.262 ng mL^?1, and relative recoveries in real samples were more than 93%.     

微波消解-原子吸收光谱法对海带中6种金属元素的测定

目的建立海带中6种金属元素的火焰原子吸收测定方法。方法利用微波消解处理海带样品,使用火焰原子吸收法测定海带中钙、镁、铁、锌、铜和锰。结果海带中含有丰富的金属元素,实验回收率为95.5%~108.2%,样品进行5次平行测定,RSD为1.22%~4.25%。结论该法具有快速、简便、灵敏、准确的优点,适用于海带中6种金属元素的测定。