悬浮液进样平台石墨炉原子吸收光谱法测定生物样品中痕量铅

本文采用超声粉碎生物样品悬浮液进样平台石墨炉原子吸收光谱法测定痕量铅，使用ＮＨ４Ｈ２ＰＯ４为基体改进剂消除共存元素干扰。方法简便、快速，分析结果准确可靠。     

悬浮液进样石墨炉原子吸收法测定茶叶中镍含量

本文介绍了一种悬浮液进样石墨炉原子吸收光谱法测定茶叶中镍含量的方法.讨论了悬浮液制备、样品粒径、取样量、悬浮液酸度及扣背景方式等因素对测定结果的影响.经优化后,方法检出限为0.32mg/kg,精密度3.64%,回收率102%.方法简单快速,效率高,劳动强度低,是测定茶叶中镍含量的高效方法.     

悬浮液进样石墨炉原子吸收光谱分析进展

悬浮液石墨炉原子吸收光谱分析结合了固体和液体进样方式的显著优势,是一种相对成熟的技术,并已作为常规分析方法广泛应用于有机和无机复杂基体中微、痕量金属元素的分析测定。文章结合最近10年来所取得的新进展进行综述,着重介绍和评论了悬浮液的制备(介质、稳定剂、质量体积比、粒径、均匀化体系)、基体改进剂、背景校正、方法校正及其分析的精密度等,并对悬浮液石墨炉原子吸收光谱分析的发展趋势进行了展望。全文共引用国内外文献80篇。     

悬浮液进样石墨炉原子吸收法测定近海沉积物中的铜

本文研究了一种使用悬浮液进样石墨炉原子吸收光谱法快速、简便地测定近海沉积物中痕量铜。采用超声波将悬浮液分散，由磁力搅拌器保证悬浮液分散、均匀、稳定，以与样品基体相匹配的近海海洋沉积物成分分析标准物质(GBW07314)进行校正。试验了悬浮液的介质、酸度、悬浮液浓度等因素的影响。本法的检出限为0．6μg／g，加标回收率为88．7％-108％，RSD为2．42％。用于实际样品的分析。本方法准确、可靠，结果令人满意。     

悬乳液进样平台石墨炉原子吸收光谱法测定生物样品中痕量铅

本文采用超声粉碎生物样品悬浮液进样平台石墨炉原子吸收光谱法测定痕量铅，使用NH4H2PO4为基体改进剂消除共存元素干扰。方法简便、快速，分析结果准确可靠。     

石墨炉原子吸收光谱法测定高纯锌中铜含量

本文对合成硒化锌单晶的原料之一－－高纯锌中铜杂质含量体了石墨炉AAS分析，测定了国产及日本产的6N和7N纯度的锌样品。实验发现，使用热解涂层石墨管时，硝酸酸度的差异对测Cu产生影响。硝酸比盐酸的空白值小得多。盐权或硝酸介质时，样品的最高灰化温度分别为200℃和700℃，基体对测Cu分别产生60％和30％的负干扰。酒石酸可消除锌基体对铜的负干扰。本方法测Cu的特征量为30皮克／0.0044A，回收率为88－116％。     

微乳液进样石墨炉原子吸收光谱法测定润滑油中铬

润滑油、Tween80、与 1%硝酸溶液 3种组分按 1.5∶ 3∶ 18的配比可形成稳定的微乳液。本文采用标准加入法 ,微乳液直接进样 ,石墨炉原子吸收光谱法测定润滑油中铬。进样量为 2 0 μL,对最佳原子化条件进行了试验。方法的精密度为 6.6%,检出限为 0 .0 5 2μg· m L-1,回收率为 91.7%— 10 2 .5 %。     

人发中铜的石墨炉原子吸收光谱分析

文献报导的人发中铜的测定样品处理多采用干灰化法或混合酸消化原子吸收法测定。虽然这两种消化样品的方法都是可行的,但都比较费时,也容易受到试剂和高温炉的污染。笔者采用有机碱融化发样并经Triton X-100稀释后,石墨炉原子吸收法直接进样测定。本法样品处理简便、快速、无污染、分析结果精度高、回收率好。与混合酸消化样品的测定结果无明显差异。     

石墨炉原子吸收光谱法测定氯化镁中铬

以硝酸改变氯化镁基体为硝酸镁 ,减轻基体对铬的干扰。选取优化的条件 ,在硝酸镁介质中 ,使用原子吸收光谱法测定铬 ,线性范围 0— 80 ng/ m L,回收率 87.5 %— 10 9.7% ,相对标准偏差小于 10 %。方法简便 ,结果令人满意。     

火焰原子吸收光谱法间接测定碘

在弱酸性介质中 ,I- 与Cu+生成沉淀 ,经硫代硫酸钠溶解后 ,以火焰原子吸收法测定铜 ,从而间接求得碘的含量。本方法的线性范围为 0～ 80 0 μg·mL- 1 ,回收率为 99 9%～ 1 0 0 3 %,相对标准偏差为 0 7%。将方法应用于碘盐、华素片、紫菜中碘的测定 ,结果满意。     

Recent highlights in graphite furnace atomic absorption spectrometry

Graphite furnace atomic absorption spectrometry (GFAAS) is an elemental analysis technique that has been employed for virtually all types of samples. Traditionally, hollow cathode lamps, line excitation sources, have been employed for excitation. However, in the past two decades, high resolution continuum source (HR CS) GFAAS has been shown to offer greater potential for multielemental analysis, greater flexibility in wavelength selection, the ability to determine molecules, and better characterization and correction for spectral backgrounds. The recent analytical literature is critically reviewed, including solubilization and preconcentration procedures. Solid and slurry sampling have been the focus of recent work; in particular, the enhanced capabilities of HR CS GFAAS provide green methodology with suitable sensitivity, precision, and accuracy. GFAAS has also been employed for elemental speciation, including characterization of forms using the atomization profiles.     

Increasing the sensitivity of atomic absorption determination of iron

We have studied the effect of the nature and concentration of surfactants on the atomic absorption of iron. We show that using sodium dodecylbenzenesulfonate as the modifier in flame atomic absorption determination of iron in real samples makes it possible to make the measurements in a low-temperature flame (propane-butane-air type) with increased sensitivity and selectivity and also a lower detection limit for iron. We have developed a procedure for atomic absorption determination of iron in food products using sodium dodecylbenzenesulfonate as the modifier. The detection limit for iron is C_min = 0.008 μg/cm³. Report given at the International Congress of Analytical Sciences, ICAS-2006, 20–30 June 2006, Moscow, Russia __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 2, pp. 263–266, March–April, 2007.     

Increasing the sensitivity and accuracy of zinc determination in atomic absorption spectrometry

We have studied the effect of the nature and concentration of surfactants on the analytical signal of zinc. We show that of all the studied surfactants, sodium dodecylbenzenesulfonate increases the sensitivity and selectivity of the zinc determination the most. We have designed a method for atomic absorption determination of zinc in food products using sodium dodecylsulfate as a modifier. The detection limit for zinc according to the proposed procedure is C_min = 0.003 μg/mL. Report given at the International Congress of Analytical Sciences, ICAS-2006, 20–30 June 2006, Moscow, Russia. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 2, pp. 269–273, March–April, 2008.     

循环富集—冷蒸气原子吸收法测定食品中痕量汞的研究

本文以自制的循环富集装置，配以冷原子吸收测汞系统，对痕量汞的测定进行了研究。分析多种食品样品及国家标准物质得到了满意的结果。     

高分辨连续光源石墨炉原子吸收光谱法测定面制食品中的铝

使用微波消解-高分辨连续光源石墨炉原子吸收光谱法测定四种面制食品(挂面、饺子皮、油条和梳打饼干)中铝的含量.样品置于密闭聚四氟乙烯消解罐中经HNO3和H2O2混合溶液完全消解.对微波消解条件、灰化温度和原子化温度进行了优化.确定最佳实验条件为:消解液HNO3和H2O2体积比7∶1,微波功率1 000 W,190℃消解4...     

Flame atomic absorption spectrometric determination of copper,lead, and cadmium in Gastrodiae rhizoma samples after preconcentration using magnetic solid-phase extraction

In this research, ferroferric oxide nanoparticles were coated with silicon dioxide and further functionalized with alizarin complexone as the adsorbent of magnetic solid-phase extraction, thus aiming for extraction and preconcentration of heavy metals in Gastrodiae rhizoma samples. The determination of heavy metals was carried out by flame atomic absorption spectrometry. The results showed that the functionalized magnetic nanoparticles demonstrated higher extraction efficiency for copper, lead, and cadmium. The synthesized magnetic sorbents were characterized by transmission electron microscope, X-ray diffraction, and Fourier-transformed infrared spectra. Different parameters influencing the extraction efficiency including the amount of sorbent, sample pH, sorption time, solution volume, elution solvent, and reuse times were optimized. Under the optimal conditions, the method detection limit was 0.18, 0.25, and 0.12 µg/L for copper, lead, and cadmium, respectively. The proposed method was successfully applied to extract copper, lead, and cadmium in Gastrodiae rhizoma samples, and the recoveries of the samples ranged from 90.0 to 102.0% and relative standard deviations (n = 5) were in the range of 1.93–3.82%.     

悬浮液进样—火焰原子吸收光谱法测定玉米中的锌和铁

本文提出了一种悬浮液进样－火焰原子吸收光谱法测定玉米面中锌,铁的新方法。将玉米面悬浮于琼脂胶体中,直接喷入空气－乙炔火焰中,用标准加入法测定,测定结果与灰化法一致。方法简便,快速。     

悬浮体进样石墨炉原子吸收光谱法直接测定煤中微量砷

以Pd为基体改进剂 ,建立了浮体制样石墨炉原子吸收光谱法直接测定煤中微量As的方法。研究了悬浮体的稳定性、试样粒度、基体改进剂、灰化温度、原子化温度和常见共存离子等因素对待测物信号强度的影响。在优化实验条件下 ,方法的检出限为 0 0 5 4 μg·g-1,相对标准偏差 (RSD)为 8 9%     

转基因水稻糙米中痕量铅和镉的交联羧甲基魔芋葡甘聚糖微柱预富集-GFAAS测定研究

建立了以交联羧甲基魔芋葡甘聚糖(CCMKGM)为微柱预富集-GFAAS测定转基因水稻糙米中痕量铅和镉的新方法。考察了溶液的pH值、样品流速和体积、洗脱液的浓度和体积及共存离子干扰等因素对CCMKGM微柱吸附重金属的影响。结果表明:在优化条件下,方法用于富集、测定转基因水稻及亲本糙米中Pb和Cd的检出限分别为0.11和0.002μg.L-1;测定大米标准参考物质中Pb和Cd的含量,结果与标准参考值相吻合。对转基因水稻及亲本糙米进行标准加入回收实验及测定,回收率分别在90%～103%和93%～105%范围。该研究可为转基因水稻中痕量Pb和Cd分析提供技术支持。