石墨炉原子吸收法测定纯棉纺织品中重金属的含量

介绍了利用石墨炉原子吸收分光光度计测定纯棉纺织品中Cr、As、Pb、Cd等重金属总量的方法.结果表明:不同工艺阶段的产品重金属含量有较大差异,其中,总铬含量(6.9～118.4mg/kg)远远超过规定限量(1.0～2.0mg/kg),应引起厂家对绿色纺织品中有害金属控制的重视,以提高我国加入WTO后纺织品在国际市场上的竞争能力.

石墨炉原子吸收法测定全血中的锰和铝

研究了石墨炉原子吸收法测定全血中锰和铝的方法。并提出测锰采用含硝酸镁和氨水为基体改进剂 ,测铝采用含硝酸铜和氨水为基体改进剂。按 1∶ 5体积比稀释血样 ,建立无干扰的加入法基体匹配校准曲线。本法检出限低 ,灵敏度高 ,实测样品具有良好的准确度和精密度。

火焰原子吸收光谱法中湿法消解和干灰化前处理法测定三七中总铅和铬含量的比较

利用火焰原子吸收光谱法中常用的消解方法(湿法消解法和干灰化法)对文山中草药三七中总铅和铬含量进行测定研究,通过比较不同前处理方法的检测结果、试剂消耗量、所用时间,找出每种方法的优劣。干灰化法时间短;湿法消解耗费时间长,酸用量大,其溶出率相对干灰化法低。本研究对三七中总铅和铬含量测定的方法选择有一定意义。

火焰原子吸光谱法测定全血中锌、铜、铁、钙、镁

目的 :研究直接喷入火焰测试全血中锌、铜、铁、钙、镁。方法 :用 0 .5 %曲拉通 X- 1 0 0 (Trion X- 1 0 0 )稀释全血样品 ,直接用火焰原子吸收光谱进行测定。结果 :该方法的变异系数优于 6 .2 % ,样品加标回收率为 94 .3%～1 0 2 .2 %。结论 :方法的灵敏度高 ,选择性好 ,操作简单 ,适合于卫生防疫、临床医学日常检验工作。

石墨炉原子吸收光谱中GdCl_3、Gd（NO_3）_3基体的背景吸收

研究了石墨炉原子吸收光谱中ＧｄＣｌ３、Ｇｄ（ＮＯ３）３基体的背景吸收影响。背景吸收波长特性的研究表明，ＧｄＣｌ３和Ｇｄ（ＮＯ３）３的背景吸收都具有明显的波长特性。蒸发行为研究表明ＧｄＣｌ３的背景吸收主要来自ＧｄＣｌ３的分子蒸气，Ｇｄ（ＮＯ３）３的背景吸收主要来自ＮＯ。钆基体的背景吸收峰高与灰化温度有关，ＧｄＣｌ３背景吸收曲线轮廓与原子化温度和原了化方式有关。Ｇｄ（ＮＯ３）３的背景吸收远小于ＧｄＣｌ３。

微波消解石墨炉原子吸收法测定葛粉中的铅

目的:建立葛粉中铅含量的测定方法。方法:采用微波消解法处理葛粉样品,加入20.0g/L磷酸二氢铵作为基体改进剂,用石墨炉原子吸收分光光度法测定铅含量。结果:加标回收率为95.23%～101.10%,RSD=4.68(n=6),检出限为10μg/kg。结论:该法简单、快速、准确,可用于葛粉中铅的测定。

原子吸收的基本原理及汽油检测中的应用

利用原子吸收光谱分析原理制成原子吸收分光光度计由光源、原子化器、分光器、检测系统和显示装置组成.原子吸收光谱分析是汽油质量分析中必不可少的定量分析方法,是一种测量物质所产生的蒸气中原子对电磁辐射的吸收强度的仪器分析方法.

直接吸入火焰原子吸收分光光度法测定废水中锌含量的研究

本文研究了直接吸入火焰原子吸收分光光度法测定废水中的锌含量,最大吸收波长213.9 nm,锌含量在0.022 mg/L～1.250 mg/L内符合比耳定律,相关系数r=0.9991,利用该方法测定废水中的锌含量,变异系数小于5%,标准回收率98%～105%。

原子吸收光谱法测人体尿中Cu、Fe、Zn含量

用原子吸收光谱法(简称 AAS 法)直接测尿中 Cu、Fe、Zn 含量,以 NH_4Cl 溶液作为基体改进剂测 Cu、Fe;以 NH_4Cl 和 KCl 混合液作为基体改进剂测 Zn,既消除了基体干扰又提高了方法的灵敏度,方法的准确度和精度均符合要求。

原子吸收光谱法检测血液及其组分中5种微量元素的探讨

目的通过原子吸收光谱法检测全血、血浆和红细胞中的钙、镁、铜、铁、锌5种微量元素,了解用该方法检测的微量元素在3种样本内的含量分布状况。方法用原子吸收光谱法分别检测5个人的全血、血浆和红细胞中的微量元素,并对其结果进行统计分析。结果锌、镁和铁主要存在于红细胞中,钙主要存在于血浆中,铜在3者间分布无显著性差异,全血的锌、镁和铜约为全血和血浆之和的1/2。结论 3种样本中因血浆铁和红细胞钙不能用该方法直接检测,故不便于确定参考范围;而全血检测结果有较好的临床指导意义,适宜作为微量元素检测分析的样本。

两种基体改进剂在石墨炉原子吸收光谱法测定土壤重金属镉中的研究

探讨了磷酸二氢铵溶液、磷酸二氢铵-抗坏血酸复合溶液作为石墨炉原子吸收光谱法测定土壤重金属镉基体改进剂,结果显示:5%磷酸二氢铵-抗坏血酸复合基体改进剂在峰形(峰高、尖度、拖尾度)显著优于5%磷酸二氢铵、吸光值极显著大于5%磷酸二氢铵,表明5%磷酸二氢铵-抗坏血酸复合基体改进剂在消除土壤基体干扰效果上显著优于5%磷酸二氢铵溶液,其对土壤总镉测定结果灵敏度高、准确性好。

原子吸收法测定乙肝病毒携带者血清中钙、镁、锰、镉的含量

本文用原子吸收光谱法测定了30例乙肝病毒携带者和30例正常人血清中的钙、镁、锰、镉。结果表明,乙肝病毒携带者血清中钙显著降低,而镁、锰、镉与对照组相比无显著差异。

碘酸钾氧化还原滴定法和原子吸收法对退锡废水中锡含量的测试与应用

通过分析对比碘酸钾氧化还原滴定和原子吸收法对退锡废水中锡含量测试效果，为线路板退锡废水测试监控提供简单、准确，可靠的分析方法。

石墨炉原子吸收光谱法测定蔬菜中铅和镉

目的:分析探讨蔬菜中铅、镉测定的最佳工作条件。方法:对西兰花与蒜苔蔬菜样品采用硝酸-高氯酸-硫酸消解,利用石墨炉原子吸收光谱法对蔬菜中的铅与镉进行测定。结果:在最佳条件下利用石墨炉原子吸收光谱法测定蔬菜中铅和镉,测得加标回收率铅98.90%,镉102.6%。结论:在对蔬菜中的铅和镉含量进行检测中,采用石墨炉原子吸收光谱法具有快捷、准确的优势,可得到满意的测定结果,满足分析要求。

微波溶样FAAS法测定人发中锰

采用微波溶样技术消解头发样品 ,用 FAAS法测定头发中锰。实验结果表明 ,用微波溶样技术消解头发具有节省时间、节约试剂、消解完全等优点。本方法的相对标准偏差为 1.7%— 3.6 % ,回收率为93.8%— 10 2 .5%。

Determination of Chromium and Zinc in Soil by Microwave Digestion and Flame Atomic Absorption Spectrometry

[Objective] The aim was to develop a rapid, simple method for determination of chromium and zinc in soil samples by flame atomic absorption spectrometry.[Method] The method for determination of Cr and Zn in soil by combined flame atomic absorption spectrometry and microwave digestion was used. [Result] The concentration curve was linear within the range of 0-0.8 mg/L for Cr and 0-0.8 mg/L for Zn, the detection limits of Cr and Zn was 0.0025 mg/L and 0.002 3 mg/L, respectively. Recoveries of 102.4%-103.2% for Cr and 97.7%-98.3% for Zn were obtained for there soil samples. [Conclusion] The proposed method has the advantages of simple operation, high sensitivity, and high efficiency; it was successfully used for determination of Cr and Zn in soil samples.

Determination of Cadmium and Lead in Sugarcane by Graphite Furnace Atomic Absorption Spectrometer with Zeeman Correction

[Objective] The aim was to develop a rapid,simple method for determination of cadmium and lead in sugarcane samples by graphite furnace atomic absorption spectrometry.[Method] The method for determination of Cd and Pb in sugarcane by combined graphite furnace atomic absorption spectrometry and microwave digestion was used.[Result] The concentration curve was linear within the range of 0-0.80 μg/L the detection limits of Cd and Pb was 0.015 and 0.030 μg/L,respectively.The precision for elevenfold determination of Cd and of Pb at the 0.40 μg/L level were 1.8% and 2.3%（RSD）,respectively.Recoveries of 96.7%-98.2% for Cd and 104.6%-106.7% for Pb were obtained for two sugarcane samples and one certified reference material.[Conclusion] The proposed method has the advantages of simple operation,high sensitivity,and high efficiency;it was successfully used for determination of Cd and Pb in sugarcane samples.

DFT Study of Alkali Metal Atom Adsorption on Defect-Free MgO（001）Surface

The adsorption of isolated alkali metal atoms （Li, Na, K, Rb, and Cs） on defect-free sur- face of MgO（001） has been systemically investigated with density functional theory using a pseudopotential plane-wave approach. The adsorption energy calculated is about -0.72 eV for the lithium on top of the surface O site and about one third of this value for the other alkali metals. The relatively strong interaction of Li with the surface O can be explained by a more covalent bonding involved, evidenced by results of both the projected density of states and the charge density difference. The bonding mechanism is discussed in detail for all alkali metals.

Determination of the Trace Element Contents in Plants Using Atomic Absorption Spectrophotometer

The aim of the study is to investigate the contents of trace element Se, Cd, Pb in three plants including burdock, ginkgol and garlic via graphite furnace atomic absorption and standard addition method. The results show that Se in burdock stem, skin and leaf are 32.40, 48.63, 38.10 μg/g, respectively; Cd in burdock stem, skin and leaf are 0. 160 0, 0. 300 0, 0. 140 0 μg/g, respectively; Cd in burdock stem, skin and leaf are 2. 020, 3. 960, 2. 410 μg/g, respectively. In the ginkgo and ginko leaf, Se contents are 17.63 and 16.91 μg/g, respectively ; for Cd are 0. 181 0 and 0.2020μg/g, respectively ; for Pb are 3. 572 and 4. 021 μg/g, respectively. In garlic, Se, Cd and Pb are 73. 900 0, 6. 900 0 and 0. 390 0, respectively. All the standard deviations of measured results are below 2.3%, recovery rate are from 99% to 101%.

Determination of Mg Content in Crayfishby Microwave Digestion-Flame Atomic Absorption Spectrometry

[Objective] This study was conducted to investigate the Mg level in cray- fish. [Method] Microwave digestion was applied to treat crayfish sample, Mg content in which was then determined by flame atomic absorption spectrometry, and recov- ery test and the determination of standards were also performed. [Result] This method was used for the detection of Mg in crayfish, obtaining satisfactory effect. The sample recoveries were in the range of 90.0%-110%, and the detection limit was 0.8 mg/kg. [Conclusion] The method is rapid, simple, accurate and reliable, worth extending.