共查询到18条相似文献,搜索用时 203 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Reale L Lai A Tucci A Poma A Faenov A Pikuz T Flora F Spano L Limongi T Palladino L Ritucci A Tomassetti G Petrocelli G Francucci M Martellucci S 《Microscopy research and technique》2004,64(1):21-29
A method for detecting cadmium uptake in leaves of Saponaria officinalis doped with a solution of cadmium acetate is described. The technique based on the exposure of dried leaves to X-rays of a wavelength close to that of the metal K-edge could be useful for phytoremediation studies as it could reveal the bioaccumulation in plants due to the treatment either in vivo or in vitro with heavy metals. X-ray microradiography measurements are in agreement with those from peroxidase enzyme assay utilized to follow the oxidative damage induced by heavy metals. At present, as we will see in this report, microradiography has still poorer sensitivity in comparison with enzyme assay, but it has the advantage of being faster, not destructive, and usable even at very high doping levels, where the enzyme assay technique results are fully saturated. Further analysis of the optical density values could lead to a quantitative measurement of the heavy metal in the sample. Thus, the technology developed in this article could be useful for tracing the intake in phytoremediation studies. 相似文献
12.
采用X荧光光谱法测定了塑料、金属、陶瓷等多类玩具饰品表面中的重金属Cr、Cd、Pb、Hg含量。仪器预热初始化后,对不同大小,不同形状,不同属性的样品无需做任何的预处理,直接无损测定其表面重金属的含量。单个样品测定时间为2~3分钟,可连续不间断测定,检测限低,可达2mg/kg,相对标准偏差低于4.6%。所用仪器为国产仪器,仪器成本及运行和维护成本低,应用于现场实时分析,便于推广。该法具有分析速度快、操作简单、对样品无任何损坏等特点,用于玩具饰品中重金属Cr、Cd、Pb、Hg含量的测定,简单,实用。 相似文献
13.
针对挥发性和半挥发性有机物的现场检测,基于快速色谱分析技术和三维离子阱质谱技术,研制了便携式快速色谱-质谱联用仪,仪器具有吸附热解吸进样和进样口直接进样两种分析模式,能实现气体、水体和固体中有机物的现场测试。本文详细描述了该仪器的主要组成结构,对该仪器进行性能测试,结果显示该仪器分析速度快(苯系物分析时间不超过2分钟),灵敏度高(0.1ng甲苯总离子流色谱峰的峰/峰信噪比143),便携性优(重量14kg)、性能稳定(峰面积RSD≤5%)。土壤、污染源和刑侦领域中挥发性有机物和半挥发性有机物(地西沣,沸点492℃)的现场分析结果表明,仪器具有分析速度快、进样方式多样和适用于半挥发性有机物分析等优点,能用于现场监测领域有机物快速定性定量分析。 相似文献
14.
15.
A low cost microcontroller based Sodium analyzer is developed to measure the concentration of sodium in blood serum. A dedicated ATmega8535 based microcontroller and its associated peripherals are employed for the hardware. This paper explains the details of interfacing, calibration, and procedure of operation. The Sodium Ion Selective Electrode (ISE) is used as sensor for the measurement. Software is developed in ‘C’ language in order to measure, analyze, and to display the results. The blood samples are collected from many patients. Sodium concentration is measured from the collected samples. The performance of the instrument is studied by using linear regression analysis. 相似文献
16.
17.
激光共振电离质谱是激光共振电离技术和质谱技术相结合的一种新型质谱分析技术,具有高元素选择性和高灵敏度的特点,能有效克服商业质谱仪存在的同量异位素干扰难题。为满足复杂基体干扰下超痕量核素分析测量的需求,实验室研制了一台基于磁 电双聚焦质量分析器的激光共振电离质谱仪。该装置的质量分析器采用正向Nier-Johnson型双聚焦结构,由柱形静电分析器和扇形磁质量分析器组成。本文介绍了仪器质量分析器的结构和理论参数,并对其进行理论仿真与实验测试。结果表明,该仪器实现了方向和能量双方向聚焦,具有较小的高阶像差,仪器的水平方向放大率为0.78,质量色散达到500 mm,当源狭缝宽度0.25 mm、探测器入口狭缝宽度0.65 mm时,质量分辨率(10%峰谷)达到580左右,接近质量分辨率的理论极限605。最后,介绍了本实验室利用该仪器开展的分析测量工作,展示了该装置在强同量异位素干扰下超痕量核素测量方面的部分应用情况。 相似文献
18.
金相图像分析是现代信息技术与材料科学相结合的产物,是金属材料分析的重要手段;金相图像分析仪是定量分析金属材料内部显微组织必不可少的工具。概要地追溯了金相图像测量的历史,结合图例从硬件和软件两个方面综述了部分国内外的金相图像分析仪及其主要功能和应用领域,并结合网络技术的进步就其未来的发展方向进行了预测。 相似文献