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苯甲酸具有很弱的荧光,在Co2 的催化下,过氧化氢能氧化苯甲酸发出强的荧光.基于此现象,建立了测定酱油中痕量苯甲酸的催化动力学荧光新方法.该方法的灵敏度高,检出限可达8.0×10-8 g·mL-1,线性范围为2.0×10-7-8.0×10-6 g·mL-1.对8.0×10-7 g·mL-1的苯甲酸进行9次连续测定,相对标准偏差为2.4%.该方法已成功地应用于酱油中痕量苯甲酸的测定. 相似文献
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溴酸钾氧化靛蓝胭脂红催化光度法测定痕量铁的研究 总被引：1，自引：0，他引：1
庄会荣 《临沂师范学院学报》2001,23(6):28-29
研究了在稀硫酸介质中 ,痕量铁 (Ⅲ )对溴酸钾氧化靛蓝胭脂红的催化褪色作用 ,建立了催化动力学光度法测定痕量铁的新方法 .方法的线性范围为 0— 2 μg/2 5ml,检出限为 7.48× 10 - 7g·L- 1 ,用于饮用水中铁的测定 ,结果满意 . 相似文献
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催化动力学极谱法测定铬(Ⅵ)的研究 总被引：2，自引：0，他引：2
在0 01mol·L-1H2SO4介质中,铬(Ⅵ)对溴酸钾氧化甲基橙的反应具有强烈的催化作用,甲基橙于-0 59V处产生一灵敏的导数极谱波,以极谱法测定催化反应过程中甲基橙浓度的变化,建立了测定痕量铬(Ⅵ)的催化动力学新方法。该方法的线性范围为8 0×10-4～3 6×10-2mg·L-1,检出限为1 25×10-7mg·L-1,应用于电镀废水中痕量铬(Ⅵ)的测定,结果令人满意。 相似文献
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本文基于F4~(3 )对KIO_4 氧化紫脲酸铵褪色的催化效应,利用流动注射技术建立了一个催化动力学光度法测定痕量Fe~(3 )的新方法;该方法的线性范围:1×10~(-9)—1×10(-7)g/mL;检出限为:3.5×10~(-10)g/mL Fe~(3 ),RSD为1.2％(c=5×10~(-8)g/mL);方法用于人发及血清样品中痕量Fe~(3 )的测定,效果满意。 相似文献
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环境水样中NO2-的催化光度法测定 总被引：1，自引：0，他引：1
提出了催化褪色光度法测定痕量NO2-的新方法.此法是基于百里香酚蓝在H2SO4介质中被KBrO3氧化的反应受到痕量NO2-的催化.本法的检测限为4.6×10-8g/mL,测定范围为2～12μg/25mL. 相似文献
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褪色光度法测定痕量亚硝酸根的研究 总被引：2，自引：0，他引：2
研究了在稀硫酸介质中NO2-催化溴酸钾氧化邻苯三酚红的褪色反应,建立了测定痕量NO2-的新方法。线性范围0～3.1μg/25ml,检出限为4.45×10-6g/L。用于池塘水中痕量NO2-的测定,结果满意。 相似文献
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研究了在硝酸介质中,痕量Ti((Ⅳ))催化过氧化氢氧化甲基橙褪色的指示反应。研究了催化褪色反应的最佳条件,建立了测定痕量钛的新方法。方法的检出限为3.8×10~(-11)g Ti((Ⅳ))/mL,测定范围0～0.5μgTi((Ⅳ))/25mL,用于测定大米中的痕量Ti((Ⅳ)),获得了满意的结果。 相似文献
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在硫酸介质中,抗坏血酸存在下,痕量铅能灵敏地催化溴酸钾氧化吖啶红褪色．研究了该催化褪色反应的最佳条件,建立了一种测定痕量铅的新方法．该方法的线性范围为20-85μg·L^-1,检出限为3×10^-7μg·L^-1．用于中药中铅的测定,相对标准偏差为1．73％～4．06％,加标回收率为97．1％～103．8％．实验结果表明,在三种中药中,山药中铅的含量最高,山楂中铅的含量最低． 相似文献
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梁国柱 《南通职业大学学报》2004,18(2):77-78
本文研究了在硫酸介质中,痕量铁(Ⅲ)催化过氧化氢氧化茜素红而使其褪色的动力学条件,建立了测定痕量铁的新方法,其灵敏度为2.0×10-9g/mL,线性范围0—7μg/25 mL,用于水样、食品中痕量铁(Ⅲ)的测定,结果令人满意。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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李晓劲 《读与写:教育教学刊》2008,5(6)
Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context. 相似文献
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宋少华 《读与写:教育教学刊》2008,5(5):3-5
This essay mainly studies the linguistic features of News English on stylistics.The study is made mainly on three aspects of News English.They are lexical features.sentence features and grammar features of News English.Through the study we find that News English,as a distinctive and new language.has its own lin-guistic features in words, sentences and grammar. 相似文献
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正Nong Luhuan had a wild dream when he was little.He wanted to become a cartoonist and publish books of his own.Now,the 22-year-old art design major at Sichuan Fine Art Institute has achieved his dream.His micro blog cartoon has more than 260,000 followers and he will publish his first book this week.农璐焕小时候有一个疯狂的梦想,他想成 相似文献
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正The hardest arithmetic to master is that which enables us to count our blessings.世界上最难的算术题是如何清点我们的祝福。According to legend,a young man while roaming the desert came across a spring of delicious crystal-clear water.The water was so sweet,he filled his leather canteen so he could bring some back to a tribal elder who had been his 相似文献