开缝石英管火焰原子吸收法测定微量汞

采用开缝石英管火焰原子吸收测定微量汞，并加入一定量的基体改进剂。应用本法测定食品中的微量汞，使汞分析操作十分方便，无需专门附属设备。本方法回收率在９８．６％，相对标准偏差为１．０３％。     

火焰原子吸收法测定人参中的微量镁

通过干法灰化、混酸消化、硝酸溶解的方法处理样品,利用火焰原子吸收法测定人参中微量镁的含量。待测溶液在0．06-7．0μg．mL-1范围内有很好的线性关系,回归方程为A=0．0565C＋0．0405,相关系数为0．9987,检出限为0．008μg．mL-1,特征浓度为0．017μg．mL-1／1％,回收率为97．7-103．2％。方法适用于测定各种中药材中的微量镁含量。     

火焰原子吸收法测定植物中微量铬

本文提出了一种简易快捷的火焰原子吸收(FAAS)分析植物样品中的铬的方法。采用甲基异丁基酮萃取富集后,消除了基体的干扰,使分析结果准确可靠。     

火焰原子吸收法测定水中钴

文章探讨了火焰原子吸收法测定水中钴的最佳仪器测量条件、测定下限，并对多种水样进行了加标回收实验和水中共存元素的干扰实验，结果表明该方法简便快捷，准确度高，运行成本低。     

火焰原子吸收法测定植物叶片中的微量铅

通过炭化、灰化、混合酸消解和稀硝酸溶解的方法处理样品,利用火焰原子吸收法测定植物叶片中微量铅的含量.待测溶液在0.1～5.0μg.mL-1范围内有很好的线性关系,回归方程为A=0.1053C+0.0071,相关系数为0.9991,检出限为0.006μg.mL-1,特征浓度为0.031μg.mL-1/1%,平均回收率为100.28%.方法适用于测定各种植物叶片中的微量铅含量,可以据此评价环境质量.     

应用顶空—冷原子吸收法测定水中微量汞

应用静态顶空－冷原子吸收法快速测定水中微量汞，操作简便快速，灵敏度高，重视性好。汞含量在０。０１０－０。０５０μｇ回收率为９５。００％－１０３。３３％，平均回收率为９９。３３％，标准偏差０。０６，变异系数２。２３％，最小检测浓度为０。０４μｇ／Ｌ。     

火焰原子吸收法测定

文章采用硝酸一高氯酸湿法消化发样，用火焰原子吸收法直接测定1～14岁儿童头发中的银、锌、钙、铜、铁，并初步探讨了这些微量元素之间的关系，从对照组可看出，锌与银呈正相关，银与铜呈负相关，铁、钙与银、锌的关系看不出。标准加标回收试验的回收率为95．6％～106％。     

DETERMINATION OF TRACE CADMIUM BY FLOW INJECTION ON-LINE MICROCOLUMN PRECONCENTRATION COUPLED WITH FLAME ATOMIC ABSORPTION SPECTROMETRY USING HUMAN HAIR AS A SORBENT

A novel method using a cone-shaped pipette tip packed with human hair as an adsorption material has been developed for the on-line flow injection preconcentration of trace Cd(II) ions based on its complex formation with the ammonium pyrrolidine dithiocarbamate (APDC) prior to flame atomic absorption spectrometric (FAAS) determination. Cd-PDC complex sorbed on the human hair was eluted by 4.0 mol L^?1 HNO₃. The enhancement factor is 19, and the detection limit (3σ) is 0.77 μg L^?1. The proposed method was successfully applied to the determination of trace cadmium in drinking water, beverage samples, and the certified reference materials.     

DETERMINATION OF COPPER(II) IN NATURAL WATERS BY EXTRACTION USING N-O-VANILLIDINE-2-AMINO-P-CRESOL AND FLAME ATOMIC ABSORPTION SPECTROMETRY

A simple and accurate solvent extraction method was developed for the separation and preconcentration of trace levels of copper(II) in water using N-o-vanillidine-2-amino-p-cresol prior to its determination using flame atomic absorption spectrometry. Analytical parameters such as the pH of the aqueous phase, extraction time, concentration of the reagent, concentration of the nitric acid back extraction agent, volumes of aqueous phase and back extraction agent, and concomitant ions on the extraction yield of the copper(II) were investigated and optimized. Under the optimal conditions, the detection limit (3σ) was 0.61 µ g L^?1 for a 25 mL blank solution, yielding a preconcentration factor of 12.5. The method was succesfully applied to the determination of copper(II) in tap water, river water, and seawater. The accuracy of the method was verified by analyzing two certified reference materials and spiked water samples. The results obtained were in agreement with the certified values and the recoveries for spiked water samples were between 98 and 112%.     

A MODULAR-TYPE ATOMIC ABSORPTION INSTRUMENT WITH THE GRAPHITE FURNACE IN A GLOVE BOX FOR NUCLEAR APPLICATIONS

This article describes a glove box adaptation of an atomic absorption spectrometer with a graphite furnace as the atomization source. Unlike flame atomic absorption, in which the ground state atoms quickly diffuse out of the atom cell, graphite furnace atomic absorption, being a total consumption technique, offers the ability to de-solvate and atomize the entire sample solution in a more controlled environment. This significantly improves the sensitivity and provides superior detection limits with microliter sample volumes. An atomic absorption instrument was converted into separate modular units consisting of the source, atomizer, and detection system. In addition, these units were modified to enable their use in the glove box, allowing the analysis of nuclear samples. Proper optical alignment of the source, atomizer, and detector system was performed to allow the analysis of toxic samples.     

火焰原子吸收光谱法测定茶叶中铅铜

本文采用干灰化 盐酸消解试样 ,消解液用火焰原子吸收光谱法测定茶叶中铅和铜。在铅吸收波长 2 1 7 0nm处 ,铅在 0～ 1 0 μg/mL呈现良好的线性关系 ,在铜吸收波长32 4 nm处 ,铜的线性范围为 0～ 5 0 μg/mL ,相关系数γ =0 .9996。以 3SA/S计 ,铅检出限 :0 0 6 μg/mL ;铜检出限 :0 0 0 8μg/mL ;方法精密度RSB <3%。回收率 96 %～ 1 0 2 %。     

花卉土壤中钾和钠的原子吸收测定方法研究

土壤中的有机物先用硝酸和高氯酸加热氧化,然后用氢氟酸分解硅酸盐等矿物,硅与氟形成四氟化硅逸去,继续加热至剩余的酸被赶尽,使矿物质元素变成金属氧化物或盐类。用盐酸溶液溶解残渣,使钾、钠分别转变为钾离子和钠离子,经适当稀释后用火焰原子吸收分光光度法测定溶液中的钾离子和钠离子的浓度,再换算为土壤中钾、钠的含量。     

火焰原子吸收光谱法测定茄子中钙镁

本文建立悬浮液技术及非完全消化 -火焰原子吸收光谱法快速测定茄子中钙、镁的分析方法。试验表明 ,在悬浮液中加入适量盐酸可显著提高钙、镁的吸光度。对盐酸溶液用量、化学干扰、背景吸收干扰、试液与空白溶液物理性质的一致性进行考察。测定结果的RSD小于 1.1% ,测定结果与灰化法一致 ,相对误差小于± 1.0 %。     

介质辅助微波消解用于原子荧光测定蔬菜中的汞

利用介质辅助微波消解仪对样品进行前处理,原子荧光准确测定蔬菜中汞的含量,加标回收率在90％-101％之间,RSD在0．6％～2．6％。介质辅助微波消解可使消解、赶酸、定容一次完成。具有快速高效、安全方便等优点。     

非完全消化-火焰原子吸收光谱法测定苦瓜中的矿质元素

非完全消化处理样品,即在低温下用浓硝酸一高氯酸（4＋1）混合酸消解样品,再加入乳化剂TX-10溶解消化过程中所产生的油脂,可得黄绿色透明的样品溶液。建立了非完全消化一火焰原子吸收光谱法快速测定苦瓜中的钙、镁、铁、锌、铜的分析方法,对非完全消化法样品处理条件、干扰、混合酸及试液的物理性质与其空白溶液的一致性、检出限和特征浓度进行了考察。测定结果的相对标准偏差小于2．0％。本方法的测定结果与灰化法一致,相对误差小于2．4％。实验所测定钙、镁、铁、锌、铜元素的检出限分别是O．51、0．009、0．145、0．009、0．019μg／mL。