悬浮液技术-火焰原子吸收光谱法测定明胶中钙镁

用悬浮液技术处理明胶样品。将样品烘干、粉碎、过筛,制备成琼脂悬浮液。取适量样品悬浮液加入释放剂Sr2+配制成试剂,喷入空气-乙炔火焰进行测定,建立了悬浮液技术-火焰原子吸收光谱法快速测定明胶中钙、镁的分析方法。以空白溶液为参比,用工作曲线法测定。对琼脂溶液用量、化学干扰、试液与空白溶液粘度一致性、背景吸收干扰及检出限进行了考察。测定结果与灰化法一致,相对误差小于±0．9％,相对标准偏差小于5．2％。方法简便、准确。     

悬浮液进样火焰原子吸收光谱法测定豆米类粮食中镁

将样品磨细配制成悬浮液,并对悬浮剂的选择及化学干扰的消除进行了考查。为消除化学干扰，取适量悬浮液，加入La3+溶液制成试液。将试液喷入空气-乙炔火焰，以空白溶液为参比，用工作曲线法进行测定。测定结果与灰化法一致，相对误差小于±1.3％。方法简便、快速、准确。     

悬浮液进样-火焰原子发射光谱法测定豆米中的钾和钙

将悬浮液进样技术应用于火焰原子发射光谱法,建立了测定豆米类粮食中钾、钙的快速分析方法。对悬浮剂的选择、干扰的消除、线性范围及检出限进行了考查。将样品粉碎、制成琼脂（米类）或琼脂－邻苯二甲酸二丁酯豆类）悬浮液,取适量样品悬浮液加入适量琼脂及释放剂Ｌａ（Ⅲ）或消电离剂ＮａＣｌ 溶液配制成试液。本方法的测定结果与灰化法－火焰原子吸收法一致,ＲＳＤ＜ ３．３％ ,钾、钙的检出限质量浓度分别为０．０１２ ｍ ｇ／Ｌ、０．０４１ ｍ ｇ／Ｌ。     

海洋生物样品中痕量汞的悬浮液进样流动注射-原子荧光法测定

研究了一种使用悬浮液进样原子荧光光谱法测定海洋生物样品中痕量汞的快速简便的方法；控制悬浮液的颗粒粒径小于或等于76μm，用磁力搅拌器搅拌以保证悬浮液分散均匀稳定，以水溶液标准作标准曲线，该法检出限为0．002μg/L，加标回收率为90％-105％，RSD(n=6)为3．9％；将该法用于标准物质GBW08571和实验室互校样的分析，得到了满意的结果，证明该法准确可靠。     

悬浮液进样—火焰原子吸收光谱法测定大豆粉中的镁

将大豆粉制成琼脂悬浮液，直接喷入空气－乙炔火焰，用工作的曲线法进行测定。测定结果与灰化法一致。检测限为９×１０＾０－３ｍｇ／Ｌ，相对标准偏差〈５．４％。     

悬浮液进样—火焰原子吸收光谱法直接测定大豆粉中的钙

钙是人体内极为重要的元素之一，缺钙会产生多种疾病，将样品制成悬浮液直接进样，在非火焰原子吸收光谱法中已有应用，我们将悬浮液进样技术应用于火焰原子吸收光谱法，成功地测定了大豆粉中的钙．，方法简便．１实验部分１．１仪器和试剂ＨＧ－９００２型原子吸收分光光...     

火焰原子吸收光谱法测定猪肝中铜铁锌

用悬浮液技术及非完全消化法分别处理猪肝样品,建立了悬浮液技术和非完全消化-火焰原子吸收光谱法快速测定猪肝中铜、铁、锌的分析方法。试验表明,在悬浮液中加入适量盐酸可显著提高被测元素的吸光度,试液的粘度与空白溶液的一致,无背景吸收干扰。对非完全消化法样品处理条件、悬浮液的稳定时间及酸的影响进行了考察。相对标准偏差小于4.0%,测定结果与灰化法一致,相对误差小于±1.8%(悬浮液法),±2.7%(非完全消化法)。     

悬浮液进样火焰原子吸收光谱法测定面粉中铁锌

提出了一种新的原子吸收光谱法,即悬浮液进样火焰原子吸收光谱法,并用于面粉中铁锌的测定。将面粉配制成悬浮液,直接喷入空气－乙炔火焰,用标准加入法测定,测定结果与灰化法一致。方法简便快速。     

火焰原子光谱法测定中成药丸中钙镁锌

用悬浮液技术处理中成药丸样品，将样品烘干、粉碎、过筛、悬浮于琼脂溶液中制成悬浮液。以Sr^2 溶液作为钙、镁的释放剂，以吸收法测定镁、锌，以发射法测定钙。对样品悬浮液的稳定时间、干扰、试液与空白溶液粘度的一致性及线性范围进行了考察。测定结果的相对标准偏差小于1．7％，加标回收率为96．6％～102．6％。     

中草药中铁锌钙的悬浮液进样-火焰原子吸收光谱法测定

将悬浮液进样技术应用于火焰原子吸收光谱法, 建立了中草药中微量元素的快速分析新方法。将样品粉碎、悬浮在琼脂胶体中制成悬浮液; 取适量样品悬浮液配制成试液, 喷入空气－ 乙炔火焰, 用标准加入法测定。 用该法成功地测定了当归、川芎及川乌中的铁、锌、钙, 测定结果与灰化法一致, 方法简便、快速、准确。     

火焰原子吸收光谱法测定高铋铅中的铜

建立了火焰原子吸收光谱法测定高铋铅中铜含量的方法。研究了多种溶样方法,最终采用硝酸-酒石酸溶解试样,在硝酸(10%)介质中以火焰原子吸收光谱法测定溶液中的铜量,加标回收率在99.4%~105%,相对标准偏差(RSD,n=7)小于3.5%。方法操作过程简单,精密度高,回收率良好,能够较好地满足分析检测的要求。     

火焰原子吸收光谱法连续测定陶瓷绝缘子镀液中的锌、铜、铁

采用火焰原子吸收光谱法进行镉镍电池陶瓷绝缘子镀液中锌、铜、铁含量的连续测定。在优化条件下．该方法灵敏度高，干扰小，选择性和重现性好，步骤简单，操作容易，分析周期短。测定结果的相对标准偏差均小于1．0％，加标回收率为97．0％～99．0％。该法适用于镉镍电池陶瓷绝缘子镀液中锌、铜、铁含量的现场控制分析和样品系统分析。     

火焰原子吸收光谱法测定粗锌中的铜

建立火焰原子吸收光谱法测定粗锌中的铜含量。采用硝酸–酒石酸溶解样品,并以其为测定溶液介质,检测波长为324.7 nm,以水为参比,采用空气–乙炔火焰以原子吸收光谱仪进行测定。在优化的实验条件下,铜的质量浓度在0.10~2.50μg/m L范围内与吸光度有良好线性关系,相关系数为0.999 7,方法检出限为0.01μg/m L。测定结果的相对标准偏差为1.0%~3.0%(n=11),样品加标回收率为97%~102%。该方法具有灵敏度高,干扰少,重现性好等优点,适用于铜含量在0.001%~0.50%之间的粗锌中铜的测定。     

FIA-AAS determination of salicylic acid by a solid-phase reactor of copper carbonate incorporated in polyester resin beads

The determination of salicylic acid was carried out by reaction of the drug with copper carbonate entrapped in a polymeric material in a solid-phase reactor; the released cupric ions were monitored by flame atomic absorption at 324.8 nm. The calibration graph is linear over the range 4.0-75 mug ml(-1) of salicylic acid, with a relative standard deviation of less than 1.5% and a sample throughout of 257 h(-1). The influence of foreign compounds was studied and the method was applied to the determination of salicylic acid content in two different pharmaceutical formulations.     

Determination of copper in medicinal plants used as dietary supplements by atomic absorption spectrometry with direct flame solid analysis

An alternative device for the direct solid analysis (DSA) for copper determination by flame atomic absorption spectrometry (FAAS) is proposed. Copper was directly determined in commercial medicinal plants used as dietary supplements. The determination of copper in solid samples by DSA–FAAS was made by using a conventional air–acetylene flame. Between 0.05 and 1.5 mg of each test, sample was weighed directly into a small polyethylene vial connected to the device used for solid introduction into the flame. Test samples were introduced into the flame as a dry aerosol using a T-quartz cell set between the burner and the optical path. The T-quartz cell has a slit in the superior part by which the solid aerosol passes to the flame. A transient signal, evaluated as integrated absorbance, is produced and it is totally integrated in 2 s. Background signals always presented absorbance values less than 0.1. It was found a characteristic mass of 0.8 ng Cu and absolute limit of detection of 1.2 ng (3 s), or 1.2 μg g⁻¹ if a sample mass of 1 mg was used. Optimized conditions for air flow rate, flame stoichiometry, and so on were established as well. No excessive grinding of the samples was needed and samples with particle of size less than 80 μm were used throughout. No statistical difference between the results from the proposed system and those obtained by sample digestion and determination by conventional FAAS was observed. With the proposed procedure, more than 50 test samples can be analyzed in 1 h and it can be easily adapted to conventional spectrometers for FAAS.     

Direct flame solid sampling for atomic absorption spectrometry: determination of copper in bovine liver

In this work a new device for the direct introduction of solid samples into flame atomizers is proposed. The determination of copper in bovine liver reference material by flame atomic absorption spectrometry (FAAS) using a conventional air–acetylene flame was chosen as an example. Between 0.05 and 0.50 mg of the test sample was weighed directly into a small polyethylene vial connected to a glass chamber. A flow of air carries the test sample as a dry aerosol to a T-shaped quartz cell positioned above the burner in the optical path. The atomic vapor generated produces a transient signal of less than 3-s duration; integrated absorbance is used for signal evaluation. Optimized conditions for air flow rate, flame stoichiometry, etc., were evaluated. There was no statistical difference between the results from the proposed system, compared with those obtained by prior sample digestion and determination by conventional FAAS. No excessive grinding of the samples was required and samples with particle size less than 80 μm were used throughout. Background signals were always low and a characteristic mass of 1.5 ng was found for Cu. The proposed system allows the determination of 60 test samples in 1 h and it can be easily adapted to conventional atomic absorption spectrometers.     

Comparison of slurry sampling and microwave-assisted digestion for calcium, magnesium, iron, copper and zinc determination in fish tissue samples by flame atomic absorption spectrometry

The development of a slurry sampling method for the determination of calcium, copper, iron, magnesium and zinc in fish tissue samples by flame atomic absorption spectrometry is described. In comparison with microwave-assisted digestion, the proposed method is simple, requires short time and eliminates total sample dissolution before analysis. Suspension medium was optimized for each analyte to obtain quantitative recoveries from fish tissue samples without matrix interferences. Nevertheless, iron recoveries higher than 46% were not found. Treatment of samples slurried in nitric acid by microwave irradiation for 15-30 s at 75-285 W permitted to achieve efficient recoveries for calcium, iron, magnesium and zinc. Further improvement in the matrix effects for iron determination was accomplished by the use of an additional step of short microwave-assisted suspension treatment. However, standard addition method was required for calcium and copper determination, being necessary hydrochloric acid as suspension medium for the last one. Although copper could not be determined in the certified reference material using microwave-assisted digestion, the accuracy of the slurry sampling method was verified for all the investigated analytes. Detection limits were 22.8 ± 8.0, 0.884 ± 0.092, 5.07 ± 0.76, 35.5 ± 0.7 and 1.17 ± 0.04 μg g⁻¹ for calcium, copper, iron, magnesium and zinc, respectively. The standard deviations obtained using slurry sampling method and microwave-assisted digestion were not significantly different, and the mean relative standard deviation of the over-all method (n = 3) of the slurry sampling method for different concentration levels was below 12%.     

Determination of Nickel,Manganese, Copper and Zinc in Blood Serum by Atomic Absorption Spectrometry after Deproteinization by Microwave Irradiation

ABSTRACT

Deproteinization of serum was performed by microwave irradiation combined with a small volume of diluted trichloracetic acid. The procedure reduced the protein level of the samples to less than 99% of the total with a small dilution factor (1+1) and allowed the determination of nickel and manganese by electrothermal atomic absorption spectrometry and copper and zinc by flame atomic absorption spectrometry directly without modifiers or matrix interferences. As metallic ions are normally bonded to serum proteins they must be released during protein precipitation. Spiked serum samples were submitted, before the deproteinization, to an incubation treatment to bond the added ions to the proteins. To check the efficiency of the incubation time for each ion, serum samples were ultrafiltered at set time intervals and the metals determined in the ultrafiltrate. The proposed method was compared with the common deproteinization by acids for the separation of the proteins. The reduction of proteins allowed a small dilution of the sample and the use of faster temperature programmes for the determination of nickel and manganese by electrothermal atomic absorption spectrometry and the aspiration of samples more similar to aqueous standards for copper and zinc determination by flame atomic absorption spectrometry. Recoveries from spiked, incubated and deproteinized samples compared to only diluted samples show that the method can satisfactorily be used for atomic absorption spectrometric determination of these elements.     

悬浮进样原子吸收法测定茶叶中的微量元素

用悬浮液技术处理茶叶样品,即将样品烘干、粉碎、过筛,并悬浮在1.5g/L琼脂溶液中制成均匀的悬浮液,建立了火焰原子吸收快速测定茶叶中微量元素的方法。该法快捷、简便、具有良好的精密度和准确度,应用于实际样品的测定结果满意。