石墨探针—石墨炉原子吸收光谱法测定人发中痕量铬研究

石墨探针原子化技术是一种实现等温原子化,改善灵敏度的行之有效的方法,采用此方法对痕量铬进行了一系列条件试验,峰面积与铬浓度在０～１００ｎｍ．ｍｌ＾－１范围内呈线性关系,特征为１６．９ｐｇ,检出限为２７．２ｐｇ（３σ）,相对标准偏差为３．１％测定了发标和发样中痕量铬的含量,回收率为９４．５％～１０６．７％。该方法灵敏度高,操作简单、快速,结果满意。     

石墨炉原子吸收法测定感光胶片中的痕量钯

1 引言 金作为感光乳剂的增感剂已有多年的历史,但将钯应用于感光胶片则是近十余年的事。国外某些著名感光胶片生产厂家,已成功地将钯增感技术用于某些片种的生产过程。为了提高国产胶片的质量,我们对胶片中痕量贵金属的分离分析方法,作了一些探索和研究。本文采用聚四氟乙烯密封溶样罐酸解胶片乳剂膜,丁二酮肟—氯仿溶液萃取钯,石墨炉原子吸收法测定。方法简便、可靠,优于国外文献报道方法,回收率高于90％,相对标准偏差<10％。     

化学修饰电极富集石墨炉原子吸收法测定痕量金

本文提出用聚丙烯脒硫氰酸盐化学修饰石墨管内壁、电化学预富集石墨炉原予吸收测定Au的分析方法.分析灵敏度提高100倍.应用于矿石中痕量Au的测定,获得了满意的结果.     

悬浮液进样石墨炉原子吸收法测定土壤中铋

对于微、痕量元素分析中的试样分解、分离技术和检测手段既要求方法简捷、测试灵敏,并要求分解试样中减少元素污染和损失。其中悬浮液进样石墨炉原子吸收法是很有前途的分析技术,但用于铋的测定未见报道。本文使用悬浮液进样,试样粒度不超过50μm。用铵盐作基体改进剂较有效地解决石墨炉中的基体干扰。本文采用1.5g·L~(-1)磷酸三铵作为土壤中铋的测定基体改进剂。方法不经试样分解、分离等步骤,快速、灵敏、准确测定土壤中微、痕量铋,对有代表性的风化土壤样分析,结果令人满意。     

悬浮液进样-石墨炉原子吸收光谱法测定生物样品中微量铬

提出了固体悬浮液进样石墨炉原子吸收光谱法直接测定铬的方法,并对各分析条件进行了优化.采用1.2 g·L-1琼脂溶液为悬浮剂,将样品均匀悬浮于其中,由自动进样器直接将样品悬浮液注入石墨炉中,加入基体改进剂,石墨炉原子吸收光谱法测定生物样品中铬.在优化的试验条件下,方法的检出限(3σ)为0.5 pg·L-1.铬的质量浓度在50 μg·L-1以内呈线性关系,回归方程为A=0.2521 C 0.0311,样品加标回收率为98.6%～103.2%.     

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乎无干扰，并测定７５名健康体检者，其参考范围为０．４７６－０．５９２μｇ／Ｌ。     

石墨探针-石墨炉原子吸收光谱法测定人发中痕量镍

石墨探针原子化技术是一种实现等温原子化和改善灵敏行之有效的方法，采用此方法对痕量镍的测定作了一系列条件试验，峰面积与镍浓度在０－２００ｎｇ／ｍＬ范围内呈线性关系，特征量为５１．８３ｐｇ，检出限为８６．８２ｐｇ，相对标准偏差为３．８６％。     

The Determination Of Thallium In Human Hair By Graphite Furnace Atomic Absorption Spectrophotometry

Abstract

An atomic absorption spectrophotometric procedure is des-scribed for the rapid determination of thallium in human hair. Samples of 500 μg are dissolved in nitric acid and treated with hydrogen peroxide. Aliquots of 10 μL are then analyzed using electrothermal atomization in a graphite tube furnace. The characteristic concentration for the method is 1 mg Tl kg^?1 which is adequate for forensic investigation. The relative standard deviation for a series of signals from a hair sample spiked to contain 32 mg Tl^?1 kg was 3 per cent.     

润滑油中痕量铜的石墨炉原子吸收光谱法测定

润滑油、Tween80、1%硝酸溶液三种组分按1.5∶3∶21的体积比可形成稳定的微乳液.采用标准加入法,微乳液直接进样,石墨炉原子吸收光谱法测定润滑油中铜.进样量为20μL,对最佳原子化条件进行了试验.方法的精密度为5.1%,检出限为0.055mg.L-1,回收率为96.7%～105.0%.     

乳化剂OP存在下乙炔-空气火焰原子吸收法测定人发中锶

本文研究了八种表面活性剂对空气乙炔火焰中Ｓｒ原子吸收信号的影响，发现乳化剂ＯＰ能使Ｓｒ原子吸收信号增强５５％，同时还有降低和消除共存离子干扰的效果。采用６％（Ｖ／Ｖ）乳化剂ＯＰ为增敏剂测定了人发中痕量锶，回收率为９６～１０４％，相对标准偏差为２．５％。     

Determination of Lead in Human Hair by High Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry with Microwave Digestion and Solid Sampling

The content of lead in human hair was measured by high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS) combined with microwave-assisted digestion (MAD) and direct solid sampling (DSS). Hair strands were washed, dried, and then cut into three parts (root, middle portion, and tip). For MAD-GFAAS assays, approximately 0.25 g of hair was completely digested using a mixture of concentrated nitric acid and hydrogen peroxide in a closed system. In the DSS-GFAAS assays, 0.1–0.2 mg of dried hair was directly introduced into a graphite furnace using a solid autosampler. The temperature programs were optimized and the effects of various added modifiers were compared. The results indicated that NH₄H₂PO₄ was the optimal modifier for analysis of Pb using GFAAS. Use of the optimal modifier and temperature program gave similar limits of detection for MAD-GFAAS and DSS-GFAAS of 1.16 ng/g and 0.82 ng/g, respectively. Both methods also produced satisfactory recoveries ranging from 98.69% to 103.14%. There was no significant difference observed between the Pb contents of hair strands determined by the MAD-GFAAS and DSS-GFAAS assays, which both indicated that the Pb levels increased along the hair strands. Comparison of the two methods revealed that DSS-GFAAS had several advantageous characteristics over MAD-GFAAS, including the need for much less sample material and having a less time-consuming procedure, lower sample blank absorbance, lower memory effect, and no risk of environmental pollution by digesting chemicals. The direct solid sampling technique can be employed as a good alternative to conventional wet digestion in AAS assays.     

铁盐增敏-石墨炉原子吸收法测定岩石样品中超痕量金

在解脱测定液中引入三价铁盐,并在其增敏下,使用石墨炉原子吸收法测定岩石样品中的超痕量金．方法检出限为0．02ng／g,精密度（RSD,n=12）为5％～8％．方法准确可靠．进行国家一级标样物质的测试,结果符合质量要求,与标准值吻合．     

氟化钙增敏石墨炉原子吸收法测定人发和血清样品中痕量钼的研究

石墨炉原子吸收法测定生物样品中痕量钼时，用氟化钙作基体改进剂，可使钼的原子吸光度提高５．７倍，其特征量原来的４．２× １０＾－１１ｇ／１％吸收降低到５．１×１０＾－１２ｇ／１％吸收，测定下限为０．５５ｎｇ·ｍＬ＾－１，线性范围为０～１０００ｎｇ· ｍＬ＾－１． 对人发和牛血清标样中痕量钼测定。结果满意。     

微波消解石墨炉原子吸收法测定环境空气中痕量锡

建立石墨炉原子吸收法测定环境空气中痕量锡的方法。采用混合纤维素微孔滤膜采集环境空气样品,用硝酸–氢氟酸微波消解样品,以5%硝酸镧–10%酒石酸混合液作基体改进剂,石墨炉原子吸收法进行测定。当采样体积为4 800 L,定容体积50 m L时,方法检出限为0.024μg/m~3,样品加标回收率为96.0%~106.0%,测定结果的相对标准偏差为2.74%~5.81%(n=7)。该方法样品处理操作过程简单,酸用量少,可用于环境空气中痕量锡的测定。     

湿法消解–石墨炉原子吸收标准加入法测定土壤中的镉

土壤样品经过硝酸–氢氟酸于130℃加热回流处理后,采用石墨炉原子吸收标准加入法测定半消解样品中镉的含量。以5%氯化铵或0.1%硝酸钯作为化学改进剂,灰化温度为500℃、原子化温度为2 000℃。当标准系列吸光度在0.18以内时,镉标准溶液的质量浓度在0~3.0μg/L内与吸光度呈良好的线性,相关系数r=0.998 6,方法的检出限为0.02 mg/kg,实际样品测定结果的相对标准偏差为3.93%~5.30%(n=5)。用该法与国标方法对土壤标准样品进行测定,两种方法测定结果一致。该法快速、简便,适用于土壤中镉含量的快速检测。