石墨炉原子吸收光谱法测定电子行业用丙酮中痕量铅

石墨炉原子吸收光谱法测定电子行业用超高纯电子级丙酮中痕量铅,较火焰原子吸收法灵敏度高,检出限低,但由于超高纯电子级丙酮中基体比较复杂,因此在石墨炉原子吸收光谱法测定中,由基体引起的背景吸收干扰往往比较严重。为此利用氘灯进行背景校正。同时进行加标回收测定。试样经处理后,注入原子吸收分光光度计石墨炉中,电加热原子化吸收283.3nm共振线,测定超高纯电子级丙酮中痕量铅,获得了较满意的结果。     

浅析测定超高纯化学试剂中微量钙元素

研究了超高纯试剂异丙醇中痕量钙的石墨炉原子吸收光谱测定法,制定了石墨炉原子吸收光谱法测定痕量钙的分析程序,试样经挥发浓缩,采用标准曲线法测定;还确定了仪器最佳工作条件、原子化条件等,研究了共存离子的干扰、回收试验及实测样品等;同时将石墨管用氯氧化锆进行适当的处理,并控制合适的工艺条件,提高了石墨炉原子吸收法测定钙的灵敏度,获得了较满意的结果.     

石墨炉原子吸收法测定土壤样品中的痕量铊

本文建立了石墨炉原子吸收法测定土壤样品中痕量铊的方法。样品经盐酸-硝酸-高氯酸-氢氟酸分解后,以抗坏血酸作基体改进剂消除基体影响,用石墨炉原子吸收进行痕量铊测定。方法测定痕量铊的方法检出限为0.2ng/g,精密度（RSD）为3.19%,结果令人满意。     

测定超高纯试剂无水乙醇中的铁

研究了超高纯试剂无水乙醇中痕量铁的石墨炉原子吸收光谱测定法。制定了石墨炉原子吸收光谱法测定痕量铁的分析程序,试样经挥发浓缩,采用标准曲线法测定。还确定了仪器最佳工作条件,原子化条件,回收试验及实测样品等。该方法结果准确、稳定,RSD<1%,在线性范围内,相关性系数r=0.99950。获得了较满意的结果。     

平台石墨炉原子吸收法测定山楂叶中的痕量镉

以硫脲-EDTA-磷酸二氢铵为基体改进剂,利用平台石墨炉原子吸收法分析了山楂叶中痕量镉的含量,探讨了平台石墨炉测定镉的基体改进剂和仪器条件的影响.方法检出限为0.06 ng/mL,样品检出限为0.19 ng/g.     

压力消解石墨炉原子吸收法测定小龙虾中铅和镉

目的：建立了压力消解技术进行样品前处理,石墨炉原子吸收法测定小龙虾中铅和镉含量的测定方法。方法：采用硝酸和过氧化氢混合消解液,压力消解法对小龙虾样品进行消解,以磷酸二氢铵作为基体改进剂,氘灯扣背景,石墨炉原子吸收光谱法对样品中铅和镉含量进行测定。结果：铅在0μg/L～50μg/L范围,镉在0μg/L～4.0μg/L范围具有良好的线性,相关系数大于0.999,RSD〈10%。结论：压力消解法具有方法简便、试剂空白低、样品测定准确、易于普及等优点。     

聚氨酯泡塑富集-石墨炉原子吸收法测定土壤样品中的痕量金

本文论述了一种聚氨酯泡塑预富集-石墨炉原子吸收法测定土壤化探样品中痕量金的方法。样品经马弗炉700℃灼烧3～4h,再经王水溶解、泡塑振荡吸附、硫脲解脱,以抗坏血酸作基体改进剂消除基体影响,用石墨炉原子吸收进行痕量金的测定。方法测定痕量金的检出限为0.03μg/g。用本方法测定土壤样品中痕量金,回收率为91.6%～102.6%,方法精密度(RSD)为3.45%～7.33%。     

石墨平台原子吸收光谱法测定铅

石墨平台原子吸收光谱法测定铅周鸣（广西化工研究院南宁５３０００１）采用石墨炉原子吸收光谱法，应用石墨平台技术，以磷酸二氢铵作基体改进剂，氖灯扣除背景，测定硅藻土助滤剂痕量铅，方法准确、快速、克服了化学法、比色法检测痕量铅的困难，还做了不同酸介质影响试...     

石墨炉原子吸收光谱法测定高纯钛酸钡中痕量硅

高纯超细钛酸钡中硅的存在会导致钛酸钡某些性能的下降，限制了其应用领域。用石墨炉原子吸收光谱法研究钛酸钡中痕量硅的测定，在高纯钛酸钡新领域的研究及生产中都有重要的现实意义。用氢氟酸高压密封溶解样品，石墨炉原子吸收光谱法测定高纯钛酸钡中痕量硅，干扰少，测定结果准确，相对标准偏差小于6％。     

石墨炉原子吸收光谱法测定水中镉

文章采用磷酸二氢铵作为基体改进剂,利用石墨炉原子吸收法测定水中痕量镉,镉在0～2.5μg/L范围内有良好的线性关系,相对标准偏差为3.1%,回收率为95.1%～105.2%,具有良好的精密度和回收率,可以快速,准确地测定水中镉的含量。     

石墨炉原子吸收法测定水中镉和铅

采用石墨炉原子吸收光谱法测定不同水体中的铅,镉的含量.分别试验了不加改进剂、加重铬酸钾、加磷酸二氢铵三种检测方法对测定结果的影响.铅、镉的线性范围分别为0~20 ng/mL、0~15 ng/mL,相关系数r分别为0.999 8、0.999 8,回收率分别为96.5%~101.1%和98%~103.1%,相对标准偏差分别为RSD≤1.026%和RSD≤1.038%。     

Sampling improvements in atomic absorption spectroscopy

Atomic absorption spectroscopy is being used as a routein method to determine sodium, potassium, calcium, magnesium, copper and many other metallic elements in oils, fats, milk and other substances. Copper and iron can be measured directly in milk without sample preparation. When highly acidified samples are run, a new plastic-lined nebulizer is useful to prevent spurious results due to corrosion. A new sampling device, the Graphite Furnace, can analyze extremely small samples and gives detection limits in the picogram (10⁻¹² g) range. One of 28 papers presented at the Symposium, “Metal-Catalyzed Lipid Oxidation,” ISF-AOCS World Congress, Chicago, September 1970.     

巯基棉富集分离-火焰原子吸收法测定镉

研究了巯基棉富集分离 ,火焰原子吸收法测定镉的分析方法。该法测镉灵敏度为 3.95× 10 - 3μg·ml- 1,为不用巯基棉时的近 10倍 ,方法简便 ,选择性好 ,用于皮蛋中的镉的测定 ,方法的变异系数为 2 %～ 5% ,回收率为 94 %～ 10 6%。     

Dithiocarbamate-incorporated monodisperse polystyrene microspheres as specific sorbents: Adsorption of cadmium ions

In this study, adsorption of cadmium ions from aqueous solutions by using dithiocarbamate-incorporated monodisperse crosslinked polystyrene (PS)-based sorbents was investigated. Monodisperse PS microspheres with a diameter of 2 μm were produced by dispersion polymerization of styrene in isopropyl alcohol/water by using polyvinylpyrrolidone and azobisisobutyronitrile as stabilizer and initiator, respectively. These microspheres were then crosslinked by using divinylbenzene. In order to incorporate dithiocarbamate functional groups on the PS microsphere, first benzylamine was physically absorbed, then the amine groups were transformed into dithiocarbamate groups by interacting these microspheres with carbon disulphide. These PS-based sorbents carrying physically entrapped benzyl dithiocarbamate were characterized by scanning electron microscopy, optical microscopy, FTIR, and elemental analysis. Adsorption of cadmium ions on the PS-based sorbents were investigated in the batch equilibrium experiments by using atomic absorption spectrophotometer. Adsorption rates were very fast. Adsorption equilibria were achieved within 5-60 min. The highest adsorption capacity achieved was 154.1 mg cadmium/g sorbent. The most suitable pH was 6.0. © 1996 John Wiley & Sons, Inc.     

乙苯或二甲苯和异丙醇二元体系等压汽液相平衡

用经E llis汽液平衡釜验证的自制汽液平衡釜测定了异丙醇+乙苯及异丙醇+邻二甲苯、间二甲苯、对二甲苯4个二元液系在压力为99.80 kPa时的等压汽液平衡数据,并进行了热力学一致性检验。用UNIQUAC模型处理了实验数据,得出了二元体系的混合自由能。这不仅为二元液系混合体系充实了实验数据,还为二元液系的热力学研究丰富了理论依据。     

Atomabsorptiometrische Bestimmung von Kupfer und Eisen in Butter

Determination of Copper and Iron in Butter by Atomic Absorption Spectroscopy A pressurized digestion method for the determination of traces of copper and iron in yellow fats (butter) by atomic absorption spectroscopy is described. As the specimen is only in contact with inert materials (PTFE) in a closed system during the digestion period contaminations are minimal. The repeatability of the method, expressed as relative standard deviation, was 7.13% for Cu and 8.56% for Fe. Standard recovery was better than 95% for both elements. The Cu and Fe content of 128 Austrian butter samples evaluated with the described procedure averaged 0.025 ppm Cu and 0.167 ppm Fe respectively.     

原子吸收光谱技术在重元素测定方面的应用

重金属元素如铜、铅、钴、锰、镉、汞等如果超过一定的浓度会对人体产生危害,与人的身体健康可谓是息息相关。原子吸收光谱法一般用来测定样品中的重金属元素,本文从原子吸收光谱的应用等方面简单介绍了原子吸收技术在重金属研究方面的应用。     

微波消解-火焰原子吸收光谱法测定氧化铝中的氧化钠

氧化铝中氧化钠含量的测定,一般采用高温熔结,用水浸出钠盐后,用原子吸收火焰光度法测定,该方法的测定周期比较长,而且高温熔结时对铂金皿的损耗比较大。文章提出了试样用磷酸和硫酸混合溶液,在高压微波消解器中进行处理,将样品在较短的时间内消解,并在试液中加入一定量的氯化铯,消除钠的电离干扰,采用原子吸收光谱法直接测定,测试结果与标准样品推荐值比较,结果令人满意。     

Binary component sorption of Cu(II) and Pb(II) with activated carbon from Eucalyptus camaldulensis Dehn bark

The objective of this work is to illustrate the potential in the use of activated carbon in the binary component sorption of copper and lead ions. Eucalyptus bark was used as a precursor for the activated carbon which was prepared through the phosphoric acid activation process. This activated carbon was then used for the sorption of copper and lead ions. The quantity of the metal ions in the solution was measured with the Flame & Graphite Furnace Atomic Adsorption Spectrophotometer. The results indicated that the optimal pH for sorption was 5. The maximum sorption capacities for Cu(II) and Pb(II) were 0.45 and 0.53 mmol g⁻¹. Carboxylic, amine and amide groups were found to involve in the sorptions of Cu(II) and Pb(II). A major mechanism for the uptake of both heavy metals was proven not to be ion exchange but adsorption. In binary component sorptions, activated carbon still could sorb Pb(II) in a greater amount than Cu(II). However, the presence of the secondary metal ions suppressed the sorption of the primary metal ions. There seemed to have a linear inverse dependency between the sorption capacity and the concentration of the secondary metal ion.