平台石墨炉原子吸收法测定血清铬

介绍了用平台石墨炉原子吸收法测定血清铬的方法，详述了测定的实验条件，比较了平台石墨炉原子吸收法与火焰法、普通石墨管石墨炉原子吸收法测定血清铬的差异，提出以硝酸镁为基体改进剂，血清经酸处理后可使测定结果几无干扰，并测定了７５名健康体检者，其参考范围为０．４７６￣０．５９２μｇ／Ｌ。     

塞曼效应石墨炉原子吸收法测定骨肿瘤患者血清中铬

用镧盐涂覆石墨管,大幅度提高测定血清铬灵敏度,选用硝酸铵基体改进剂,消除干扰,方法简便快速,灵敏度和精密度高。     

石墨炉原子吸收法测定微量血清中铜

铜是人体必需的微量元素之一,对造血,细胞生长,某些酶的活性及内分泌功能等均有重要的作用.但大量吸收铜的粉尘,烟气及铜盐的气尘后,将引起急性中毒,此时血清铜可升高.此外中毒后的某些毒物也可使机体铜代谢紊乱.因此,测量血铜含量可作为某些疾病和某些含铜毒物中毒时临床诊断的参考指标.     

石墨炉原子吸收法测定PU材料中的铬

采用微波消解技术进行样品前处理,建立了石墨炉原子吸收法测定PU材料中铬含量的方法。在波长429.0 nm下,利用石墨炉程序升温测定,狭缝设为0.5 nm,塞曼效应作为背景校正。标准工作曲线线性良好,相关系数r=0.9986,方法检出限为0.051μg/L,测定结果的相对标准偏差为3.78%,加标回收率为92%～120%(n=6)。该方法简便、可行,适用于PU材料中铬的测定。     

石墨炉原子吸收法测定动物组织中的微量铬

采用石墨炉原子吸收法测定动物组织中的微量铬,以HNO3-HC lO4为消化剂,消化温度为250℃,消化时间为90 m in。研究了进样酸度和共存离子对测定结果的影响,铬的浓度在10~300 ng/(10 mL)内服从比耳定律,铬的浓度与吸光度的线性相关系数为0.998 4。将该方法用于兔肝脏中铬的测定,测定结果的相对标准偏差为5.0%(n=10),加标回收率为93.8%~95.0%。     

石墨炉原子吸收法测定红细胞锰

以１％Ｔｒｉｔｏｎ Ｘ－１００溶液稀红细胞成悬液，用日立１８０－８０型塞曼原子吸收分光光度计石墨炉原子化法测定其中的锰含量、由工作曲线校准，回收率在９７．０％－１０４．０％，重现性变异系数〈５．０％。     

石墨炉原子吸收法测定泥蚶中的铬含量

本文研究了HNO3-H2O2体系消解石墨炉原子吸收法测定泥蚶中的铬的方法,结果表明本方法简便、精密度好、准确性高。方法检测限为0.039μg/g,实际样品回收率为80.0%~98.0%。     

石墨炉原子吸收光谱法测定糖尿病人和健康人血清和尿中微量铬

研究了石墨炉原子吸收光谱法测定糖尿病人和健康人血清及尿中微量的铬，在测定血清铬时，对其蛋白质进行沉淀，有效地降低了基体干扰，该法回收率高，精密度好，在测定健康人和糖尿病人血清和尿中微量铬时，得到满意结果。     

Selenium Determination in Serum by Graphite Furnace Atomic Absorption Spectrometry

Selenium concentration in serum has been proposed as the most valuable indicator of human selenium status. In this work, the concentration of selenium in serum is measured by GFAAS using longitudinal Zeeman-effect background correction, a highly sensitive technique that can be used to determine selenium at sub-ppb level. Standard reference materials are analyzed to verify the accuracy and precision of this technique. The direct method proposed in this study is used for the determination of selenium in human serum collected from healthy people of 19–25 years and women of 21–34 years in the First trimester of pregnancy. The method developed in this study, which can quickly and accurately measure serum selenium, is suitable for applications in clinical diagnosis or biological monitoring.     

Direct Determination of Ultra Trace Nickel in Serum by Controlled-Temperture Graphite Furnace of Atomic Absorption Spectrophotometry

Abstract

This paper describes a method of direct determination of serum Ni by controlled- temperature graphite furnace of AA. Ammonium oxalate is used as a matrix modifier to eliminate interferences caused by chlorides of alkali and alkaline earth in sample. The operating procedure has been applied to determine Ni contents of serum from 190 adults in Hefei district of China and good results have been obtained.     

微波消解石墨炉原子吸收光谱法测定钛白粉中铅

采用微波消解系统消解钛白粉样品，研究了各种酸的用量与不同消解程序对消解效果的影响，选择了微波消解的最佳工作条件。用平台石墨炉原子吸收光谱法测定样品中的铅，与常压酸消解法的结果作比较，结果基本一致。     

石墨炉原子吸收分光光度法测定血清中铜

铜系人体内含有的微量元素。测定血清中Cu/Zn比值,有助于病因分析和提供诊断依据。目前,测定血清铜所用的仪器分析方法甚多。本法无需对血清样进行预处理,取样量仅20—50μl。碱金属和碱土金属卤化物无干扰。特征质量m。为5.6pg/0.0044A.S,回收率98～102%,变异系数1.7-2.7%。     

石墨炉原子吸收光谱法绝对分析

石墨炉原子吸收光谱法(GFAAS)绝对分析近年来得到了较显著的发展,其主要原因是由于GFAAS中基体干扰问题获得了解决;用以描述GFAAS性能的特征质量MOE值相对稳定;以及用L’vov提出的计算MOT值的式子算出的32个元素的MOT值已比较接近其实验MOE值。大量数据表明完全有可能实现GFAAS绝对分析。     

Speciation Analysis of Serum Copper by Ultrafiltration Combined with Graphite Furnace Atomic Absorption Spectrometry

Ultrafiltration combined with graphite furnace atomic absorption spectrometry (GFAAS) was used to study protein binding and speciation of copper in human serum. Ultrafiltration was carried out using a cell unit with ultrafiltration membranes having a nominal cut‐off of 10,000 Dalton. The effects of various experimental factors including the kind and concentration of electrolyte, sample storage, pH. pressure and the preconditioning of the membranes on the speciation analysis of serum copper by ultrafiltration were examined. It was observed that 4.5 ± 2.3% of the total copper in serum was ultrafiltrable and this value did not seem to be influenced by the total serum elemental concentration, the pH (6.5–10) and the pressure (≤ 1.5 kg/cm²). The preconditioning of the ultrafiltration system with 0.1 mol/L calcium nitrate can overcome the adsorption loss of copper effectively, and the addition of tris‐HCl solution (pH 7.4) to serum accelerates the ultrafiltration. The present method was proved to be suitable for speciation analysis for its simplicity, rapidity, small sample requirement and easy control. The results obtained with the method are accurate and reliable.     

Iron Interference in the Measurement of Selenium in Whole Blood,Plasma and Serum by Graphite Furnace Atomic Absorption

Abstract

Selenium is considered to be a trace element and the determination of diagnostic levels are most conveniently measured in blood, plasma or serum in humans and animals. The approach that is taken varies according to laboratory preferences. One such method involves the use of Graphite furance Atomic Absorption Spectroscopy (GFAAS). The simplicity of diluting the sample followed by direct determination without further preparation is the most attractive characteristic of this method, coupled with good sensitivity. Proper precautions must be taken however, including that of choosing the proper instrumental parameters for the analysis. If deuterium background correctiopn is used then then analyses should be carried out at the 204.0 nm line of Selenium. By using a matrix modifier consisting of Cu/Mg, deuterium background correction and off the wall of the graphite tube atomization, the determination of the analyte was demonstrated to be possible at the mentioned wavelength, free from iron interference present in the samples.     

等温平台石墨炉原子吸收法测定食用明矾中的铅

本文介绍了通过应用等温平台石墨炉,以(NH_4)_2HPO_4为基体改进剂,塞曼背景校正和积分吸收信号测定食用明矾中的Pb。本法有效地抑制了样品中基体干扰。重现性好,检测限为10pg,平均回收率为101.1%。     

平台石墨炉原子吸收法直接测定高温镍基合金中硒

研究了基体改进剂及其用量,硒的灰化、原子化和出现温度,以及近20种共存离子的干扰。采用镍和钯混合液作基体改进剂,硒的灵敏度高,抗干扰能力强,不需要分离样品基体,可以采用平台石墨炉法直接测定高温镍基合金中硒。