微波等离子体原子发射光谱法(MP-AES)测定果汁中的常量元素

介绍了使用配有Agilent 4107氮气发生器的Agilent 4200微波等离子体原子发射光谱法(MPAES)分析果汁样品中的钙、镁、钠和钾等常量元素的分析方法,在分析两种质量控制(QC)测试材料时,加标回收率在90%~110%,6h中所有四种元素的相对标准偏差(RSD)均小于4%。与火焰原子吸收光谱法(FAAS)相比,MP-AES的等离子体源在检出限和线性动态范围等性能方面有所改善,MP-AES无需使用可燃性气体,也无需使用昂贵又费时的改性剂和电离抑制剂,对标准物质的测定结果与标准值基本一致。4200 MP-AES将是替代火焰原子吸收仪器的理想选择。     

大黄及其不同炮制品中6种元素的含量测定

采用火焰原子吸收光谱法(FAAS)测定了大黄及其不同炮制品中6种元素的含量。结果表明,大黄不同炮制品中这些元素的含量与生品相比均有差异。     

乌贼骨中微量元素测定方法对比

乌贼骨样品经高压消化罐消解,采用电感耦合等离子体原子发射光谱法(ICP-AES)和火焰原子吸收光谱法(FAAS)分别测定了样品中铁、锌、铜、锰、钙、镁、钴、镍、钾、铬、硅、铝、鉛和镉等14种微量元素的含量。结果表明:两种方法的回收率分别在96.5%~107.1%(FAAS)和96.7%~100.3%(ICP-AES)之间,相对标准偏差分别为0.7%~3.0%(FAAS)和0.2%~2.2%(ICP-AES)。经F法和t法检验,ICP-AES和FAAS测定微量元素含量的测定值之间无显著性差异。     

冬虫夏草中8种矿物元素含量分析

利用火焰原子吸收光谱法(FAAS),测定了冬虫夏草中Cu,Zn,Fe,Mn,Mg,Ca,Co以及Cd等8种矿物元素的含量,测定了各元素的加标回收率在98.9%~109.3%之间,相对标准偏差(RSD)小于1.2%,具有良好的准确度和精确度。结果表明,冬虫夏草中含有丰富的Cu,Zn,Fe,Mn,Mg,Ca,Co等多种矿物元素,不含有毒金属元素Cd。     

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...     

样品基体化学改进剂-石墨炉原子吸收光谱法测定镍合金中痕量铋

镍基合金是航空工业的重要金属材料,合金中铋、铅、锡等易挥发元素的含量对合金材料性能影响很大[1,2].原子光谱法常被用于分析镍基合金中的痕量元素,如火焰原子吸收光谱法(FAAS)、氢化物发生-原子吸收(荧光)光谱法(HG-AAS/AFS) [3]、电感耦合等离子体-质谱法(ICP-MS).     

火焰原子吸收法快速测定铁矿石中金属铁

探讨了火焰原子吸收法(FAAS法)快速测定铁矿石中金属铁的分析条件。对试样的溶解方法、元素分析线、共存元素干扰、仪器分析最佳条件等进行了试验。金属铁含量在0.2%~2.0%范围与吸光度呈良好的线性,线性方程为y=22.924x–0.8458,相关系数r=0.9991。将该法用于铁精粉样品中金属铁的测定,测定结果的相对标准偏差为1.10%~2.98%(n=6),加标回收率为98.0%~103.0%。     

ICP-AES法测定方铅矿中多元素的方法研究

采用电感耦合等离子体原子发射光谱法(ICP-AES)进行方铅矿中多元素同时测定.通过对方铅矿样品化学处理试验建立了HCl-NH4Cl-HNO3的溶矿体系.本体系采用基体匹配、背景系数和元素干扰系数校正及元素内标法确定了最佳综合实验测试条件.本实验建立的ICP-AES法同时测定方铅矿中镉、钴、铜、铁、铟、铅、锌7种元素的方法,本方法测量相对误差RE (n=8)为1.50%～7.50%,相对标准偏差RSD (n=8)为1.7%～5.7%.经国家一级标准物质GBW 07269分析验证可以满足方铅矿单矿物样品的分析要求.     

不同消解方法对火焰原子吸收光谱法测定乳制品中无机元素含量的影响

取鲜奶及酸奶样品分别用3种不同的消解方法(即常规湿法酸消解法、微波加热酸消解法和干法消解法)做预处理。在所得最终的试样溶液中分别用火焰原子吸收光谱法测定其中6种无机元素(即钙、镁、铜、锌、铁及锰)。试验结果表明:采用微波加热酸消解法处理的样品,6种元素的回收率可达94.5%～100.0%高于其他两种方法的回收率最高值,相关测定值的相标准偏差(n=6)在1.9%～4.2%之间。因此,用火焰原子吸收光谱法测定乳制品中无机元素含量时,用微波加热酸消解法处理样品的效果较好。     

盐酸超声提取-火焰原子吸收光谱法测定加热不燃烧卷烟烟丝中钾、钙、钠、镁的含量北大核心CSCD

加热不燃烧卷烟(HNB)烟丝样品经干燥、搅碎和过筛后,分取0.1 g置于锥形瓶中,加入0.05 mol·L^(-1)盐酸溶液50 mL,超声提取20 min,离心。分取5 mL上清液,定容至50 mL,采用火焰原子吸收光谱法(FAAS)测定其中钙和钠含量;分取1 mL上清液,用水定容至100 mL,用FAAS测定其中钾和镁含量。结果显示,钾、钙、钠、镁的质量浓度均在一定范围内与其对应的吸光度呈线性关系,检出限(3s/k)分别为0.50,0.08,0.02,0.02 mg·kg^(-1);对实际样品进行6次平行测定和3个浓度水平的加标回收试验,测定值的相对标准偏差(n=6)均小于5.0%,回收率为90.0%~104%。方法用于5种分别用造纸法、稠浆法、辊压法和干法制备的HNB烟丝样品的分析,发现不同工艺所制样品中4种元素含量差别较大。     

微波等离子体原子发射光谱法(MP-AES)测定地质样品中的常量和微量元素

建立了微波等离子体原子发射光谱法(MP-AES)测定地质样品中的常量和微量元素的方法,四酸(盐酸+硝酸+高氯酸+氢佛酸)消解样品,得出了使用4200 MP-AES仪分析地化认证参考物质中常规金属元素(Ag,Cu,Ni,Pb和Zn)的结果,测定样品结果的相对标准偏差落在±10%范围内,另外,IEC和FLIC模型可成功校正光谱干扰。MP-AES仪无需使用乙炔等危险气体,极大提高了实验室安全性并显著降低了运行成本。MP-AES仪已成功应用于地化样品的分析中,结果准确可靠。     

Efficiency of decomposition procedures for the determination of some elements in soils by atomic spectroscopic methods

Nine decomposition procedures for soil samples, such as via acid mixtures and fusion in open systems and microwave and autoclave dissolution (in closed systems under elevated temperature and pressure) were assessed using certified soil reference materials. The determination of various elements in solutions was performed by FAAS and ICP-OES and the results were compared with certified values and with direct current arc OES analysis.     

Determination of mercury, selenium, bismuth, arsenic and antimony in human hair by microwave digestion atomic fluorescence spectrometry

A novel method for determination of Hg, Se, Bi, As and Sb based on microwave digestion followed by continuous flow vapour generation atomic fluorescence spectrometry was developed. The digestion for Hg was based on a two stage digestion involving HNO(3) and H(2)O(2), whilst for the hydride forming elements a common digestion using HCl and H(2)O(2) was found to be the most effective. The instrumentation and chemistry were optimised in order to provide the best accuracy and precision. The method detection limit for hair samples was found to be 0.2 ng g(-1) for Hg and between 2 and 10 ng g(-1) for the hydride forming elements. The atomic fluorescence detector showed excellent linearity over the concentration ranges studied with linear correlation co-efficients between 0.99984 and 0.99997. To validate the accuracy of the method a human hair certified reference material (GBW 0706) was analysed and excellent agreement with the certified value was obtained for all elements.     

Efficiency of decomposition procedures for the determination of some elements in soils by atomic spectroscopic methods

Nine decomposition procedures for soil samples, such as via acid mixtures and fusion in open systems and microwave and autoclave dissolution (in closed systems under elevated temperature and pressure) were assessed using certified soil reference materials. The determination of various elements in solutions was performed by FAAS and ICP-OES and the results were compared with certified values and with direct current arc OES analysis. Received: 3 March 1997 / Revised: 30 May 1997 / Accepted: 3 June 1997     

广东省西南部沿海三市的翡翠贻贝、虾米、蠔中矿物质元素的研究

用火焰原子分光光度法测定了广东省阳江、茂名、湛江三地的翡翠贻贝、虾米、生蠔中的11种矿物质元素含量。结果表明,这三种水产品是优质食品,富含对人体有益的营养元素,具有较高营养价值。     

微波消解-原子光谱吸收法测定皮蛋中的六种营养元素

目的建立了皮蛋中6种营养元素的火焰原子吸收测定方法。方法利用微波消解处理样品,火焰原子吸收法测定皮蛋蛋白和皮蛋蛋黄中钙、镁、铁、锌、铜和锰。结果皮蛋中含量丰富的营养元素,回收率为97.2％～110.0％,样品进行5次平行测定,RSD为1.87％～5.61％。结论方法具有快速、简便、灵敏、准确的优点,适于皮蛋中6种营养元素的测定。     

Polarized X ray fluorescence spectrometer (EDPXRF) for the determination of essential and non essential elements in tea

Polarized X ray fluorescence spectrometer (EDPXRF) is employed for the determination of essential and non essential elements in several kinds of tea marked in Italy. The quality of data was assured by calibrating the instrument with certified reference materials. The elements are found to be present in the different kinds of tea in various proportions depending on soil composition and the climate in which the plant grows.     

FAAS法测定新疆两种不同产地沙枣中的6种微量元素

目的建立沙枣中Ca、Mg、Cu、Zn、Fe、Mn等6种微量元素的火焰原子吸收光谱法。方法在确定的火焰原子吸收光谱法检测条件下,使用马弗炉处理样品,对新疆两种不同产地的沙枣中Ca、Mg、Cu、Zn、Fe、Mn等6种微量元素的含量进行了测定。结果各元素的回收率（／Z=5）在97．50％～104．60％之间,RSD（n=5）在1．61％～3．51％之间。结论该法简单、快速,具有很好的精密度和灵敏度,适用于沙枣中6种微量元素的测定。     

On-line speciation and determination of Cr(III) and Cr(VI) in drinking and waste water samples by reversed-phase high performance liquid chromatography coupled with atomic absorption spectrometry

A simple, rapid, and selective on-line method for the speciation and determination of Cr(III) and Cr(VI) in aqueous solutions by ion-pairing HPLC coupled with flame atomic absorption spectrometry (FAAS) is described. The composition of the mobile phase has been optimized for better separation. The effects of column temperature, volume of injection loop, fuel flow rate of FAAS, and nebulizer suction rate of FAAS have also been investigated. Separation is accomplished in almost 2.5 min on a 25 cm length C18 column at 40 degrees C. The selectivity of the method has been established by investigating the effect of interfering elements on chromium determination. The detection limit (3sigma) achieved by the method was calculated as 3.7 ng/mL for Cr(III) and 2.0 ng/mL for Cr(VI). The proposed method has been validated by analyzing certified reference material (BCR 544) and successfully applied to the analysis of drinking water and wastewater samples with a relative error below 6%.