共查询到19条相似文献,搜索用时 78 毫秒
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PE公司AA-200型原子吸收分光光度计常见故障分析 总被引:3,自引:0,他引:3
原子吸收分光光度计作为测量痕量金属元素的重要手段,是一种无机化学成分分析仪器.着重分析了PE公司生产的AA-200型原子吸收分光光度计在测定过程中的常见故障及其原因,提出了处理这些故障的相应措施. 相似文献
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以PinAAcle 900T型原子吸收分光光度计(AAS)为研究对象,针对其石墨炉原子化法中常见的故障进行判断,并提出相应的解决措施. 相似文献
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汪素萍 《理化检验(化学分册)》2005,41(4):305-306
原子吸收光谱仪经过半个世纪的发展已成为微量和痕量分析的重要常规设备,其在理化分析实验室的普及程度据原子光谱分析仪器的首位。 相似文献
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《Analytical letters》2012,45(20):2521-2536
Abstract A selective and sensitive spectrophotometric and atomic absorption spectrophotometric method is developed for the determination of traces of mercury with N-phenylcinnamohydroxamic acid (PCHA) in the environment. Mercury is extracted into a chloroform solution of PCHA at pH 8.5-10.0 and determined by AAS. The mercury hydroxamate binary complex is yellow in colour having a maximum absorbance at 390 nm and molar absorptivity 4.3 × 103 1 mol?1 cm?1, sandell sensitivity 0.0466 μg/cm2. The ternary system using 1-(2-pyridylazo)-2-naphthol has molar absorptivity 8.82 × 103 1 mol?1 cm?1 at 550nm, sandell sensitivity 0.0228 μ/cm2. Beer's law is obeyed in the concentration range of 2.37-38.0 ppm and 0.80-19.5 ppm of mercury for binary and ternary system, respectively. The extraction of Hg-PCHA binary system is studied with a liquid cation exchanger, bis-(2-ethyl hexyl) phosphoric acid (HDEHP) and found to have better selectivity than Hg-PCHA-PAN system. The molar absorptivity of the Hg-PCHA-HDEHP system is 8.82 × 103 1 mol?1 cm?1 at 390 nm and Beer's law is obeyed in the concentration range of 0.47-20 ppm of mercury. The present method is applied to the determination of mercury in eye drops, aurvedic drugs and environmental samples. 相似文献
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Y. K. Agrawal G. D. Mehd 《International journal of environmental analytical chemistry》2013,93(3-4):183-188
Abstract The eight newly synthesized chlorosubstituted hydroxamic acids are described for the extraction and spectrophotometric determination of vanadium. The sensitive and selective reagent, N-m-Chlorophenylpalmito hydroxamic acid, (m-CPPHA), which gives violet coloured vanadium complex was extracted with chloroform from 6M HCl. The violet coloured complex thus obtained has a maximum absorbance at 520 nm and molar absorptivity 4.9 ± 1031mol?1cm?1. The Beer's law obeyed in the region 0.50-12.0ppm. Effects of acidity, reagent concentration, diverse ions have also been investigated. A comparison has been made with atomic absorption spectrophotometric method. Vanadium has been determined in the environment, e.g. plant, soil, rock, etc. 相似文献
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《Analytical letters》2012,45(13):1095-1104
Abstract A procedure has been developed which permits the direct analysis of powdered whole-coal samples by atomic absorption or atomic emission methods using conventional instrumentation, thereby eliminating time-consuming ashing and sample-digestion procedures. Linear plots of the absorption signal intensity versus the elemental concentration of analyzed whole-coal samples were obtained for several elements. Preliminary results indicate this method is applicable for the estimation of both minor-level (eg., Fe and Ca) and trace-level (eg., Pb and Zn) constituents. 相似文献
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探讨了非色散原子荧光光度计检定中部分技术指标与检测方法对高灵敏度、智能化新型仪器的适应性,提出了相关修改补充建议。经实际计量检定证明行之有效,较好的解决了实际工作中遇到的无法实施或检定指标与具体检测要求不相适应的问题,保证了计量检定后仪器分析结果的准确程度与公正性。 相似文献
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以高分辨连续光源原子吸收光谱仪为基础,通过对仪器硬件系统的改造、相关附件的安装以及软件的升级更新,实现砷、汞等重金属元素,铝、钛、锡等高温元素以及高盐样品的准确测定,从而实现了仪器的升级改造及功能拓展,应用范围得到提升,为研究工作提供更全面的无机元素分析. 相似文献
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利用原子吸收分光光度法分别用钾空心阴极灯测钠、锌空心阴极灯测铜,标准曲线线性良好,相关系数均在0.999以上。钾灯测量钠质控样结果为0.747 mg/L,在质控样标称值范围(0.712±0.049)mg/L之内。锌灯测量铜质控样结果为1.23 mg/L,在质控样标称值范围(1.19±0.05)mg/L之内。钾灯测钠的相对标准偏差为0.47%(n=6),加标回收率为99.8%。锌灯测铜的相对标准偏差为0.53%(n=6),加标回收率为103%。一灯多用在环境监测工作中是可行的。 相似文献
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建立连续光源原子吸收分光光度法同时测定磷酸一二钙(MDCP)中铅、镉的方法。MDCP经盐酸消解后,以氢氧化钠溶液调节p H为11,加入KCN作为掩蔽剂,用二乙氨荒酸钠–四氯化碳络合铅、镉离子,再经CCl_4进一步萃取浓缩,采用连续光源原子吸收分光光度法测定铅、镉的含量。该方法铅、镉的检出限为1,0.5 mg/kg;用于不同批次MDCP产品测定,铅、镉测定结果的相对标准偏差分别为3.58%,6.91%(n=11);铅、镉的加标回收率分别为88.9%~104.7%,91.0%~106.4%。该法可用于MDCP中痕量铅、镉的同时测定。 相似文献
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《Analytical letters》2012,45(10):855-868
Abstract Background correction in atomic absorption spectrophotometry using a high temperature furnace has a close relation to the chemical treatment and the detection limit. Conventionally used for this correction is the D2 lamp method, but spectral interference is inevitable in this method because the spectral bandwidth of the light from the D2 lamp after passing through a monochromator is as wide as 0.1 to 5 nm. In the analysis of Sb in lead alloy or in steel, there is spectral interference due to high concentration of elements such as Pb, Cu or Fe, in the matrix, so accurate measurement is impossible unless these elements are removed at the pretreatment stage. In polarized analyte Zeeman atomic absorption spectrophotometry developed by the authors, the wavelength of the measuring beam is the same as that of the reference and they are identical in spectral line profile as well as in geometrical shape. They differ only in the direction of polarization. For these reasons, we found that there is no spectral interference like that recognized in the D2 lamp correction technique. As a result, a direct analysis was done simply by dissolving gunmetal or steel in acid without removing the matrix elements Pb, Cu or Fe. 相似文献