共查询到17条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
火焰原子吸收光谱法测定百合中的微量元素 总被引:2,自引:0,他引:2
建立了湿法消解和超声波震荡提取相结合处理样品,火焰原子吸收光谱法快速测定百合中微量元素的分析方法。试验表明,铜、锌、铁、锰之间不存在相互干扰,无背景吸收;钾、钠、钙、镁易于电离,测定时需要在样品稀释液中加入消电离剂氯化锶;钾、钠产生分子吸收,需要自吸收扣背景。测定结果与湿消解法一致,相对误差小于±1.34%。 相似文献
5.
6.
7.
火焰原子吸收法测定石油焦中的铁、镍、钠 总被引:3,自引:0,他引:3
采用火焰原子吸收分光光度法测定石油焦中的铁、镍、钠,方法简便、快速、准确。回收率为96.5%-105.3%,样品测定的相对标准偏差小于6.3%,对实际样品的测定结果令人满意。 相似文献
8.
9.
建立测定注射用头孢噻呋钠含量的紫外分光光度法.结果表明,头孢噻呋钠的最大吸收波长为292nm,头孢噻呋钠在2.5-22.5μg/mL浓度范围内,其吸光度与浓度呈现良好的线性关系:A=0.0547x+0.0102,R2=0.9999(n=9).该方法操作简单快速,结果准确,可用于注射用头孢噻呋钠的含量测定. 相似文献
10.
ICP-AES测定钾石盐中钾、钠、钙和镁的含量 总被引:2,自引:0,他引:2
在选定的最佳条件下,样品直接溶解后采用ICP-AES测定钾石盐中钾、钠、钙、镁的含量,其最终检测结果与化学法测定结果一致。该方法简便、快速、线性范围宽、测量稳定、可多元素同时测定。回收率为98.3%—100.2%。 相似文献
11.
12.
直接溶样-火焰原子发射光谱法测定金属钠中的杂质钾 总被引:3,自引:0,他引:3
中国实验快堆(CEFR)选用金属钠做为冷却剂,其中杂质钾对它的热性能产生影响。为了核级钠中钾的含量,建立了直接溶样-火焰原子发射光谱法测定钠中的杂质钾的方法。实验中研究了超声波加湿溶样系统,优选了燃气(C2H2)、助燃气(Air)流量和燃烧器高度等工作参数,研究了酸效应、基体钠和共存元素的干扰效应。进行了高纯钠中加钾的回收实验,回收率在94.7%-109.8%之间,相对标准偏差为4.2%。本方法能够满足核级钠中杂质钾的分析要求,也适应于工业钠和高纯钠中钾的分析。 相似文献
13.
14.
建立了检测止咳中药制剂中非法掺入的化学止咳平喘药物色甘酸钠的方法。选用Agilent Eclipse XDB-C18(4.6mm×150mm,5μm),以甲醇:0.34%磷酸二氢钾=15:85(V/V)为流动相。根据所检测到化合物的色谱保留时间,并与对照品比较,鉴别中药制剂中非法掺入的色甘酸钠化学药物。本实验建立的条件能够把中药制剂中添加的化学药物(色甘酸钠)完全分离开来;对20个制剂用建立的分析技术进行了检测,经与相应的标准物质比较,20个样品均未含色甘酸钠。该方法选择性强,灵敏度高,可作为中药制剂中非法加入掺入化学药物成分色甘酸钠的有效检测手段。 相似文献
15.
荷移反应用于对氨基水杨酸钠的测定 总被引:2,自引:0,他引:2
本研究了对氨基水杨酸与2,6-二氯醌氯亚胺的荷移反应,确定了反应条件,反应在丙酮介质中进行,二形成1:1的络合物,其最大吸收波长为660nm,表观摩尔吸光系数为1.17×10^3L.mol.cm^-1,用拟定方法测定对氨基水杨酸钠制剂的含量,获得满意的结果。 相似文献
16.
Sodium visibility and quantitation in intact bovine articular cartilage using high field (23)Na MRI and MRS 总被引:2,自引:0,他引:2
Shapiro EM Borthakur A Dandora R Kriss A Leigh JS Reddy R 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2000,142(1):24-31
Noninvasive methods of detecting cartilage degeneration can have an impact on identifying the early stages of osteoarthritis. Accurate measurement of sodium concentrations within the cartilage matrix provides a means for analyzing tissue integrity. Here a method is described for quantitating sodium concentration and visibility in cartilage, with general applications to all tissue types. The sodium concentration in bovine patellar cartilage plugs was determined by three different methods: NMR spectroscopy of whole cartilage plugs, NMR spectroscopy of liquefied cartilage in concentrated HCl, and inductively coupled plasma emission spectroscopy. Whole bovine patellae were imaged with relaxation normalized calibration phantoms to ascertain sodium concentrations inside the articular cartilage. Sodium concentrations in intact articular cartilage were found to range from approximately 200 mM on the edges to approximately 390 mM in the center, with an average of approximately 320 mM in five separate bovine patellae studied. In essence, we have created sodium distribution maps of the cartilage, showing for the first time, spatial variations of sodium concentration in intact cartilage. This average concentration measurement correlates very well with the values obtained from the spectroscopic methods. Furthermore, sodium was found to be 100% NMR visible in cartilage plugs. Applications of this method in diagnosing and monitoring treatment of osteoarthritis are discussed. 相似文献
17.
A method of measuring the sodium diffusion coefficient in neon and argon is presented. It is based on recording the concentration change of sodium in a sodium discharge as it diffuses along a discharge tube. A diagram of the apparatus is given and the technique of measurements is described. It is pointed out that the proposed method can also be used for measuring the diffusion coefficient of other alkaline metals in inert gases and their mixtures.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 57–62, August, 1987. 相似文献