原子吸收光谱法测定香烟烟气中重金属的含量

用原子吸收、荧光光谱法测定了不同品种香烟烟气的水吸收液中铅(Pb)、镉(Cd)、铬(Cr)、汞(Hg)的含量,并用等离子体发射光谱法进行比较测定。结果表明,原子吸收光谱法具有灵敏度高、干扰小、快捷的优点。方法回收率为98%～100%,相对标准偏差小于5.0%。实际样品测定结果令人满意。     

金属有机化合物中过渡金属的原子吸收分光光度法测定

本文报导应用火焰原子吸收分光光度法对金属有机化合物中过渡金属铜、镍、钴、铁、钼及铬的定量测定。我们将金属有机化合物溶解在适当的有机溶剂或水中,不必分离基体,即可用标准加入法直接进行测定。操作简单,速度快,相对误差<0.4％。     

火焰原子吸收分光光度法测定路边青中重金属含量

采用浓硝酸-高氯酸常压消解路边青样品,用火焰原子吸收分光光度法(FAAS)测定了路边青中五种重金属含量.实验结果表明:路边青样品中五种重金属元素含量大小顺序为铜＞铅＞铬＞锌＞镉,加标回收率为98.45％～99.45％,相对标准偏差小于0.78％.该法回收率和准确度高,精密度和重复性好,在中草药重金属含量分析中具有良好的...     

Determination of Vanadium in Foods by Atomic Absorption Spectrophotometry

ABSTRACT

A simple and sensitive method for the determination of vanadium in foods was established by using atomic absorption spectrophotometry with graphite furnace atomization. The proposed method includes formation of a chelate-complex by reacting vanadium with pyrrolidine dithiocarbamate (PDCA), extracting the chelate with xylene and measurement of the extract by atomic absorption. The recoveries of added vanadium to various foods were 91.3 and 109.1%, within 7.9% of the coefficient variation. The sensitivity of this method is 10 - 50 times higher than previous methods with a detection limit of 0.01 μg/g.     

Indirect Determination of Lidocaine by Atomic Absorption Spectrophotometry

Abstract

A new procedure for determining lidocaine chlorhydrate is described. The method consists of extracting an ion pair composed of Lidocaine and the inorganic complex Co(SCN)₄ ^2- into an organic solvent (1, 2 dichloroethane), then measure the Co in the organic phase by A.A.S. at 240.7 mm. Optimal experimental conditions concerning pH, Co(SCN)₄ ^?2 concentration, shaking time, phase ratio, number of extractions and linear range for calibration are studied. The method has a standard deviation of 10^?2. Two pharmaceutical preparations containing lidocaine, have been analyzed with very good results.     

Indirect Determination of Sulfate by Atomic Absorption Spectrophotometry

With a flow injection technique, the content of sulfate in solution was determined indirectly from the concentration of partially equilibrated barium ion in solution. To obtain improved sensitivity, atomic absorption spectrophotometry of a flame was used to determine barium. With these procedures combined with a linear calibration graph, superior sensitivity and detection limit of sulfate determination were obtained compared with those from other indirect methods.     

Indirect Determination of Bromhexine by Atomic Absorption Spectrophotometry

Abstract

A new procedure for determination of Bromohexine is described. The method consists of extracting an ion pair between the Bromhexine and the inorganic complex Co(SCN)² ₄ and measuring Co in the organic phase by AAS at 240. 7 nm. The optimal experimental conditions: pH, concentration of Co(SCN)² ₄, shaking time, phase ratio, number of extractions and the linear range of calibration are studied.

The organic phase used is 1,2-dichloroethane. The standard deviation of the method is 10^?3. The interference of foreign substances which accompany the Bromhexine in pharmaceutical preparations is studied, and the method is applied to their quantitative determination in medicines.     

痕量银的液膜富集与原子吸收法测定

研究了分离与富集痕量银的液条件,摸索出一种新的液膜体系ＴＯＡＮ２０５煤油０－ＮＨ３．Ｈ２Ｏ,提出了最佳富集条件。经５次提取分离,富集倍数可达８２倍。回收率在９８％以上。与火焰原子回收法相结合可测ｎｇ／ｍｌ级的Ａｇ＾＋此法用于富集地质标样中的痕量银,相对标准偏差为２．４％（ｎ＝１０）     

Speciation of Chromium in Natural Waters,Tea, and Soil with Membrane Filtration Flame Atomic Absorption Spectrometry

A sensitive and selective method was developed for the speciation of chromium(III) and chromium(VI) in environmental samples based on membrane filtration and determination by flame atomic absorption spectrometry. Chromium(III) reacts with cochineal red A, yielding a complex that is adsorbed on a cellulose acetate membrane filter, whereas chromium(VI) remains in aqueous solution, permitting separation. After reduction of chromium(VI) to chromium(III) with hydroxylamine hydrochloride, the total concentration of chromium was determined, and the concentration of chromium(VI) was calculated by subtraction. The pH, amount of cochineal red A, and sample volume were optimized on the basis of the recovery of Cr(III). The influence of matrix ions was also investigated. The preconcentration factor was 94. The detection limit (3 sigma) for Cr(III) was 1.4 micrograms per liter. The method was validated using environmental certified reference materials. The method was successfully employed for the speciation of chromium in wastewater and lake water.     

原子吸收光谱法测定植物叶中微量重金属

用浓硝酸与高氯酸混酸消解植物叶,其中铜、锌及锰含量较高,可直接用火焰原子吸收光谱法测定;铅、镉及铬含量较低,用石墨炉原子吸收光谱法测定;铅和镉含量甚微,受基体及共存元素干扰严重,用标准加入法消除干扰。     

火焰原子吸收光谱法测定辉锑矿中锑

对辉锑矿中Sb的溶矿条件进行了研究。采用HNO3和酒石酸溶矿,在稀HNO3介质中制备成含Sb的溶液,不经任何分离,用FAAS直接测定Sb含量。线性范围为0～80μg/mL,可用于高含量Sb的测定。1　实验部分1.1　仪器及工作参数岛津680型原子吸收分光光度计;Sb空心阴极灯,波长217.6nm;灯电流8mA;狭缝0.2nm;空气流量80L/min;乙炔流量1.8L/min;燃烧器高度0.7cm。1.2　试剂及溶液酒石酸溶液:20g/L、200g/L;Sb标准溶液:称取高纯Sb2O30.1198g于100mL烧杯中,加入10mLHNO3,10mL200g/L酒石酸溶液,加热溶解,移入100mL容量瓶中,用20g/L酒石酸溶液稀释…     

The Determination of Titanium in Silicates by Atomic Absorption Spectrophotometry

Abstract

A procedure for the quantitative determination of titanium in silicates is given. Interferences usually associated with silicate parting solutions are studied in order to develop the proper conditions for the titanium sample solution.     

微波消解-石墨炉原子吸收光谱法测定鱼肉和河蚌中的重金属

建立微波消解样品,石墨炉原子吸收光谱法测定鱼肉和河蚌中重金属Pb,Cd,Cr,Cu,Ni含量的方法。优化了石墨炉原子吸收光谱法测定条件,在最佳实验条件下,选用磷酸二氢铵作为Pb,Cd,Cr,Cu的基体改进剂,抗坏血酸作为Ni的基体改进剂。Pb,Cd,Cr,Cu,Ni的检出限分别为0.05,0.01,0.05,0.05,0.07μg/g,实际样品测定结果的相对标准偏差为6.3%~14.5%(n=6),加标回收率为84.5%~113.0%。测定了牡蛎标准参考样,测定值在标准值可接受范围内。该方法检出限低、准确度高,适用于鱼类、河蚌样品中重金属含量的分析。     

Determination of Rubidium in Biological Materials by Atomic Absorption Spectrophotometry

Abstract

A sensitive and rapid quantitative method employing atomic absorption spectrophotometry was developed for the determination of low concentrations of Rb⁺ in urine, plasma and tissue. The method requires only a single set of Rb⁺ standards, which are applicable for samples containing variable amounts of Na and K. The sensitivity of detection is 0.001 meq/L of Rb⁺.     

有机硅化合物中硅的原子吸收分光光度法测定

本文提供了一个简便、快速测定有机硅化合物中硅的方法。用氧瓶法分解试样(2-3 mg),用氢氧化钠和过氧化氢溶液为吸收液。样品溶解后,置于90℃水浴上加热半小时。冷却后,选择最佳原子化条件,用氧化亚氮/乙炔焰,采用标准加入法测定之。实验结果表明,对标准硅酸钠(Na_2SiO_3·9H_2O)中硅的测定,回收率为98.00～102.5％。吸收液氢氧化钠浓度为3N和6N时,对硅的定量测定均无影响,测定样品的相对误差<0.5％。     

固体进样-石墨炉原子吸收法测定农产品中重金属元素含量

采用直接固体进样-石墨炉原子吸收光谱法(SS-GFAAS)测定农产品中镉、铅、铜和铬重金属元素含量.通过标准物质、质控样品和电感耦合等离子体质谱法比对试验验证,各元素方法检出限均低于25 pg.方法操作简单、对环境友好、重复性好、结果准确、检出限低,满足农产品检测要求.     

原子吸收光谱法测定水中重金属镍的干扰研究进展

讨论了影响原子吸收光谱法测定水中镍元素的干扰因素及消除或抑制的方法,并展望了光谱干扰中背景校正技术和原子吸收仪器的发展前景.     

磁性石墨烯固相萃取/原子吸收法测定环境水样中的痕量铜

以1-(2-吡咯偶氮)-2-萘酚(PAN)为络合剂络合水样中的痕量铜,以磁性石墨烯(G)纳米材料为固相萃取吸附剂,建立了测定水样中痕量铜的磁性固相萃取/火焰原子吸收分光光度法。此方法将磁性石墨烯比表面积大、吸附性能好的优点与Fe3O4纳米粒子的磁性相结合,采用的磁性固相萃取避免了传统固相萃取中离心和过滤等繁琐的操作步骤。对影响G-Fe3O4萃取效率的实验因素进行了优化。在优化实验条件下,对铜离子的富集倍数为80.4倍,线性范围为0.5～100μg/L,相关系数(r)为0.998 1,检出限为0.067μg/L,相对标准偏差为2.1%～5.2%。此方法成功地应用于矿泉水、自来水、公园湖水中铜离子含量的测定,其加标回收率为94%～103%。结果表明,该磁性石墨烯纳米材料G-Fe3O4对水样品中铜的PAN络合物具有较高的富集能力。     

电感耦合等离子体原子发射光谱法测定电镀污泥浸出液中的重金属

采用硫酸-硝酸溶液浸提电镀污泥中的重金属,建立电感耦合等离子体原子发射光谱法(ICP-AES)测定电镀污泥浸出液中铜、锌、镍、铬、铅、镉、钡元素的分析方法。研究了仪器的工作条件及影响检测方法的干扰因素和消除。在选定的条件下,线性相关系数均为0.9999,检出限为0.002～0.01 mg/L,加标回收率为93.5%～106.0%,测定结果的相对标准偏差小于10%(n=6)。该方法准确快速,可用于电镀污泥浸出液中多种重金属的含量测定。