共查询到20条相似文献,搜索用时 109 毫秒
1.
本文研究了酸性铬蓝K的极谱分析法.结果表明,在pH=10.0的NH3-NH4Cl底液中,酸性铬蓝K产生-峰形好、稳定、灵敏的还原峰,其峰电位约为-0.56 V(vs SCE),峰电流及二阶导数极谱峰高随酸性铬蓝K浓度变化的线性范围在8.0×10-8mol/L-3.0×10-5mol/L(r=0.996~0.9999),检测限为2.0×10-8mol/L,精密度RSD=0.646%(n=10).标准回收率在99.4%~103.4%之间,平均回收率为100.97%,可望用于酸性铬蓝K的定量分析.此外,本文还研究了β-环糊精时酸性铬蓝K电化学行为的影响和超分子体系;利用等摩尔系列法测定了酸性铬蓝K与β-环糊精形成的包结物的包结比为1:1,用电流法测定其包结常数为33.4 L/mol;并且测定了酸性铬蓝K的还原峰电流和扫描速度、客体浓度及pH值的关系,峰电位与pH值的关系,初步讨论电极反应机理. 相似文献
2.
在pH=11的NH3-NH4Cl缓冲溶液中,Mn(Ⅱ)催化KIO4氧化酸性铬蓝K的反应可被痕量Mg^2+有效的阻抑,利用此反应可建立起一种分光光度法测定痕量镁的新方法,方法的线性范围是0.05—0.20mg/L,检出限为8.4×10^-9g/mL。此方法用于海带痕量Mg^2+测定获得了满意的结果。 相似文献
3.
在pH =7.00的条件下,痕量锰对高碘酸钾氧化酸性铬蓝K有催化作用.实验表明,测定痕量锰的最佳条件为pH =7.00B-R缓冲溶液5.0mL,酸性铬蓝K1.20mL,高碘酸钾2.80mL,氨三乙酸1mL,加热时间4min,水浴温度90℃.催化体系和非催化体系的△A =0.081,线性相关系数r=0.9994. 相似文献
4.
5.
稀硫酸介质中,痕量甲醛的存在对溴酸钾氧化甲基橙的反应有很强的催化作用。而甲基橙及其氧化产物均能在滴汞电极上产生灵敏的极谱吸附波。本文以极谱法测定催化反应过程中甲基橙浓度的变化,建立了催化动力学极谱法测定痕量甲醛的方法。 相似文献
6.
用氧化剂存在时布洛芬产生的极谱催化波提高分析灵敏度,用线性单极扫描谱法实现快速测定。在0.08mol/L HAc-NaAc(pH=4.2)支持电解质中,布洛芬于-1.06 V处产生一极谱波,当氧化剂K2S2O8存在时,K2S2O8氧化布洛芬羰基还原中间体自由基,使布洛芬再生,产生布洛芬的极谱催化波。其催化波的二次导数峰电流ip″与浓度在4.0×10-8~5.0×10-7mol/L范围内呈线性关系(r=0.9980,n=8),检测限为2.0×10-8mol/L。该方法可用于药物制剂中布洛芬含量的测定。 相似文献
7.
8.
9.
催化退色光度法测定废水中痕量铬(Ⅵ) 总被引:5,自引:0,他引:5
在pH<3的H2SO4介质中,痕量铬(Ⅵ)对催化过氧化氢氧化乙基紫(EV)的退色反应具有强烈的催化作用,据此建立了测定微量铬(Ⅵ)的催化光度法的新方法.结果表明,体系的最大吸收波长为590 nm,铬(Ⅵ)含量在0.05~0.60mg/L内符合比尔定律,方法的检出限为1.01×10-4mg/L.在氟化钠和硫脲存在下,多数常见离子不干扰测定,方法可直接用于废水中铬(Ⅵ)的测定,结果与滴定法相符,12次测定值RSD<4.5%. 相似文献
10.
催化光度法测定痕量硒的研究 总被引:8,自引:0,他引:8
利用 1 10—邻菲 口罗 啉为活化剂 ,硒 (IV)催化高碘酸钾氧化酸性铬蓝K褪色的指示反应 ,方法具有一定的选择性 ,表现摩尔吸光系数可达 3 6 5× 10 6Lmol-1cm-1。测量的线性范围为 0~ 10 0ng/ 2 5mL ,本法可直接用于头发、茶叶、火腿、牛肉等样品中痕量硒的测定 ,结果令人满意 相似文献
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
13.
14.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
15.
16.
17.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
18.
A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
19.
塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献