原子吸收光谱法快速分析纯锌中的铁铅镉

研究了利用原子吸收光谱法快速测定纯锌中铁、铅、镉含量的方法,并找出了仪器最佳的使用条件和化学试剂的合理用量,该方法具有快速、准确的效果,测定结果满意。     

微波消化-原子吸收光谱法测定中成药中Cu、Pb、Hg、As

本文建立了微波消化-原子吸收光谱法测定中成药中Cu、Pb、Hg、As的方法。四种元素方法的相对标准偏差RSD％为2-4.8％,回收率在90～110％之间,定量检出限分别为6.8μgCu/g(干态)、0.41μg Pb/g(干态)、0.13μg As/g(干态)、0.1μg Hg/g(干态)。     

原子吸收光谱法测定铅镉锌分析

原子吸收光谱法因其在测定镉、铅、锌等元素含量时有着灵敏度高以及成本低的特性而得到广泛应用,其中以火焰法和石墨炉法应用最为广泛。本文主要对原子吸收光谱法的进展进行阐述以及进行试验研究。     

原子吸收光谱法测定空气悬浮颗粒物与烟尘中的铅、镉

本文用HCl+HNO3+H2O2消解处理采集在滤膜(或滤筒)上的悬浮颗粒物(或烟尘)样品,火焰原子吸收光谱法测定试液中的铅、镉,方法快速、简便、结果准确。     

石墨炉原子吸收光谱法测定六堡茶中的铅和镉

本文用石墨炉原子吸收光谱法测定六堡茶中的铅和镉含量,优化了样品前处理条件和光谱仪的各项技术参数。结果表明:应用微波消解-石墨炉原子吸收法测定六堡茶样品中的铅和镉时,铅的加标回收率在93.1%~99.2%之间,镉的加标回收率在92.3~97.3%之间,相对标准偏差均小于5%。方法准确、方便,可满足检测六堡茶中的铅和镉要求。     

用石墨炉原子吸收光谱法测定次磷酸钠中微量铅

试样直接用水溶解,以磷酸氢二铵作测铅基体改进剂,考察了基体改进剂用量,原子化温度以及基体元素对测定的影响,在最佳测定条件下,用石墨炉原子吸收光谱法测定了次磷酸钠中微量铅,测试结果为:线性范围为0～60×10-3μg/mL,检出限为1.6×10-3μg/mL,回收率为94.0%～102.6%,RSD<5%。方法简便,灵敏度高,重现性较好。     

石墨炉原子吸收光谱法测定金银花中铅镉的研究

采用石墨炉原子吸收法(GFAAS)检测中药材金银花中微量重金属铅、镉的含量.考察了基体改进剂、灰化/原子化温度和常见共存离子等因素对测定的影响,建立以NH4H2PO4为基体改进剂石墨炉原子吸收光谱法测定金银花中微量铅、镉的方法.条件优化后的方法简便快速,重现性好,灵敏度、准确度高,铅的检出限为0.268 μg/L,镉的检出限为0.013 μg/L,回收率85%～110%.     

石墨炉原子吸收光谱法测定大米中镉含量研究

目的:通过采用石墨炉原子吸收光谱法来对大米中镉的含量进行测量。方法:首先对所要进行试验的大米做实验前的处理,对大米采用湿法消解法进行处理,采用石墨原子吸收光谱法来测定大米中镉的含量,从而对大米中镉含量的最佳测定时间、重复性、回收率和精密度进行检测。结果:选用实验大米质量1g,采用消解剂为硝酸,实验时间13h,在该实验条件进行处理,然后对进行酸化处理的大米采用石墨炉原子吸收光谱法对镉含量进行测定。石墨炉原子吸收光谱法测定大米中镉含量的加标回收率为98.78%。结论:通过石墨炉原子吸收光谱法对大米中镉含量进行测量,具有测量准确、重复性好、误差小的特点,可以用于大米中镉含量的测定。     

微波消化石墨炉原子吸收光谱法测定中成药中痕量铅、镉方法研究

本文建立了微波消化石墨炉原子吸收光谱法测定中成药中铅、镉方法。方法的相对标准偏差对铅为5.1％,镉为7.0％。回收率铅在94—110％之间,镉在99—112％之间,检出限分别为铅0.6ng/mL、镉0.02ng/mL。     

石墨炉原子吸收光谱法测定绿茶中的镉、铅

本文采用微波消解绿茶样品,利用石墨炉原子吸收法测定市售几种知名绿茶中的镉、铅的含量。实验结果表明不同省份的绿茶中镉、铅含量有不同的分布规律,其中浙江省西湖龙井茶中的镉和铅的检出限分别为0.067和1.05μg/L,回收率分别81.11～116.23%和87.05～118.68%。相对标准偏差分别3.2～5.9%和3.1～5.5%。该方法分析速度快,结果准确,适合测定绿茶中的镉和铅。     

Determination of trace metals by atomic absorption spectrometry after coprecipitation with europium hydroxide

A procedure for the determination of trace amounts of chromium(III), iron(III), lead(II) and manganese(II) is described, that combines atomic absorption spectrometry-europium hydroxide coprecipitation. The influences of analytical parameters including amount of europium(III), amount of ammonia, sample volume, etc. were investigated on the recoveries of analyte ions. The effects of concomitant ions were also examined. The recoveries of the analyte ions were in the range of 95-104%. The detection limits (3 s) were in the range of 1.7-17.1 microg/L. The validation of the presented coprecipitation procedure was performed by the analysis of Bovine Liver 1577-b and BCR-144R Sewage Sludge (domestic origin) standard reference materials. The method was applied to the determination of analytes in real samples including natural waters and some food, soil and fertilizer samples, etc. and good results were obtained (relative standard deviations < 10%, recoveries > 95%).     

石墨炉原子吸收法测定头发中硒

利用优级纯硝酸浸润,放置过夜,适当水浴加热的方法,将头发样品制备成溶液,用石墨炉原子吸收法测定头发中硒,在选定的测定条件下检出限0．004mg／l,精密度3．7％,回收率在91．1％-98．2％之间。     

FCC催化剂中锑含量

工业上经常采用锑金属钝化剂防止FCC催化剂失活,但必须严格控制钝化剂的添加量,否则会起副作用,本文采用高温盐消解法处理FCC平衡剂,然后用火焰原子吸收光谱法测定催化剂中锑含量,考察了消解温度、消解时间、酸度等对测量结果的影响,优选出了最佳分析测试条件。所建方法简便、灵敏、准确,该方法回收率在95%-99%之间,变异系数小于2.5%,最小检出限为0.092 mg/L。     

原子吸收法测定酱油中铅不确定度的评定

通过对测定酱油中铅含量的不确定度评定分析,找出不确定度产生的主要因素,评定确认最小二乘法拟合校准标准曲线及测量重复性是影响结果的最主要因素,使用标准物质(标准储备液)及稀释过程引入的不确定度也应引起重视,此方法对类似的火焰原子吸收法测定样品中待测元素含量有借鉴和参考作用。     

原子吸收光谱在分析中药微量元素中的应用

本文对近年来原子吸收光谱在分析中药微量元素中的应用现状做一概述。为我国中草药的种植与开发利用提供参考。     

Determination of trace lead in water samples by continuous flow microextraction combined with graphite furnace atomic absorption spectrometry

A new method of continuous flow microextraction (CFME) combined with graphite furnace atomic absorption spectrometry (GFAAS) was proposed for the determination of trace lead in water samples. A drop of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) dissolved in benzene is injected into a glass chamber by a microsyringe and held at the outlet tip of a PTFE connecting tube, the sample solution flows right through the tube and the glass chamber, the solvent drop interacts continuously with the sample solution, and the analyte was extracted into the drop and concentrated. After extracting for a period of time, the drop was retracted into the microsyringe and directly injected into graphite furnace for determination of Pb. Several factors affecting the extraction efficiency, such as solution pH, sample flow rate, drop volume and extraction time, were optimized. Under the optimized conditions, a concentration factor of 45 was achieved, and the detection limits for Pb were 12 pg mL(-1). The relative standard deviation for six replicate analyses of 10 ng mL(-1) Pb was 6.8%. The proposed method was applied to determine of trace Pb in water samples with satisfactory results.     

Determination of trace nickel in water samples by cloud point extraction preconcentration coupled with graphite furnace atomic absorption spectrometry

A new method based on the cloud point extraction (CPE) preconcentration and graphite furnace atomic absorption spectrometry (GFAAS) detection was proposed for the determination of trace nickel in water samples. When the micelle solution temperature is higher than the cloud point of surfactant p-octylpolyethyleneglycolphenyether (Triton X-100), the complex of Ni2+ with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) could enter surfactant-rich phase and be concentrated, then determined by GFAAS. The main factors affecting the cloud point extraction were investigated in detail. An enrichment factor of 27 was obtained for the preconcentration of Ni2+ with 10 mL solution. Under the optimal conditions, the detection limit of Ni2+ is 0.12 ng mL(-1) with R.S.D. of 4.3% (n = 10, c = 100 ng mL(-1)). The proposed method was applied to determination of trace nickel in water samples with satisfactory results.     

火焰原子吸收分光光度法测定碳素钢中铜含量的测量不确定度评定

对火焰原子吸收分光光度法测定碳素钢中铜含量的测量不确定度进行了分析,分析了测量不确定度的主要来源,并对各不确定度分量进行了评定,求得合成标准不确定度和扩展不确定度分别为0.00071%和0.0014%.     

Monochromatization of resonance radiation in Zeeman atomic absorption spectrometry

Two methods of background correction in atomic absorption spectrometry with nonselective atomic effects are investigated: first, with a source possessing a continuous spectrum and, second, that of correction based on the Zeeman effect. The parameters of the monochromator, which was developed expressly for Zeeman atomic absorption spectrometry, are considered. __________ Translated from Izmeritel’naya Tekhnika, No. 9, pp. 20–24, September, 2007.     

浅谈用氢化物——原子吸收分光光度法测定化妆品中的砷

砷是化妆品中最常见的有害元素之一,用氢化物-原子吸收分光光度法测定微量砷,具有较高的灵敏度,而且分析方法简便、快速、准确度高,测定过程中砷损失少。