共查询到20条相似文献，搜索用时 62 毫秒
1.
基于亚硝酸根与碘化钾反应生成单质碘,碘可使异硫氰酸荧光素发生荧光猝灭的原理,采用流动注射连续可更新液滴荧光法测定亚硝酸根.体系的激发和发射波长分别为492nm和516nm,亚硝酸根含量在25~100μg/L范围内有良好的线性关系,检测限为3.9μg/L.本方法灵敏度高,选择性好,操作简单.用于环境水样中痕量亚硝酸根的测定,结果满意. 相似文献
2.
氯酸钾氧化溴甲酚绿催化光度法测定亚硝酸根 总被引：1，自引：0，他引：1
徐茂田 《商丘师范学院学报》1996,(Z3)
基于亚硝酸根对氯酸钾氧化溴甲酚绿而使其褪色所起的催化作用，建立了高灵敏度催化光度法测定痕量亚硝酸根的新方法，测定范围为０．０８～０．６４μｇ／ｍｌ，用于硝酸钾和唾液中亚硝酸根的测定，结果满意． 相似文献
3.
基于酸性介质中溴氧化甲基红反应,提出了测定痕量亚硝酸根新的催化光度法,本法测定亚硝酸根的线性范围为０．０２￣０．１２μｇ／ｍｌ可用于水样中亚硝酸根的测定。 相似文献
4.
庄会荣 《临沂师范学院学报》2005,27(6):33-35
在盐酸介质中,阳离子表面活性剂溴化十六烷基三甲基铵的存在,提高了亚硝酸根与氨基黑10B 之间的重氮化偶联反应的完全程度,使测定亚硝酸根的灵敏度提高8．8％,据此,建立了一种增敏吸光光度法测定微量亚硝酸根的新方法．方法的线性范围为0-4μg／10ml,表观摩尔吸光系数为2．73×104L·mol-1· cm-1．用于水样中亚硝酸根的测定,结果满意． 相似文献
5.
基于亚硝酸根（NO）在稀磷酸溶液中催化依文思蓝-氯酸钾氧化还原反应,建立了微量NO的催化光度分析法。在最大吸收波长610nm处,NO在0～3．0μg／25ml范围呈线性关系,检测下限为3．51×10-9g·ml-1。本法用于肉制品中NW的测定,结果满意,与国标法结果相符。 相似文献
6.
在6．0mol·L^-1 HCl介质中,碘酸根在KBr的催化作用下氧化钍试剂Ⅰ而使之褪色,且褪色程度与碘酸根含量呈线性关系,据此建立了一种测定痕量碘的新方法．实验结果表明：钍试剂Ⅰ的最大吸收波长为480nm,KIO3浓度在0．0214-8．56μg·mL^-1范围内与△A480nm之间基本符合比尔定律,其表观摩尔吸光系数ε为2．45×10^4L·mol^-1·cm^-1．该方法可直接用于测定食盐中痕量碘． 相似文献
7.
在硫酸介质中,碘酸钾与番红花红0反应褪色程度与碘酸根量在一定范围内呈线性关系,从而建立了碘的光度测定新方法。结果表明,方法的最大吸收波长在518nm处,碘定量测定的线性范围为0。1．2mg／L,ε=3．19×10^4L／moL·cm.本法可直接测定食盐中的碘,结果满意。 相似文献
8.
铬黑T氧化褪色光度法测定碘的研究 总被引：2，自引：0，他引：2
探讨了硫酸介质中，碘酸根氧化铬黑T褪色分光光度法测定碘的最佳条件，其最大吸收波长为510nm，碘酸根离子浓度在0-70μg/25mL范围内呈线性关系，实验中进一步测定了动力学参数以及共存离子的影响，探讨了反应机理，方法用于测定加碘盐中碘的含量，结果满意。 相似文献
9.
10.
汪凤云 《商丘师范学院学报》2008,24(3):83-84
目的：建立一种准确、方便、易操作的水碘测定方法,方法：利用碘化物对砷-铈氧化还原反应的催化作用进行分光光度法测定,结果：取水样0．25mL,最低检测浓度31．μg／L,碘浓度在0—600μg／L的范围内呈良好的线性关系,相关系数r=-0．9998,回收率范围98．71％～101．44％,精密度与准确度均符合要求,多种离子均不干扰测定结果,结论：操作及计算简单快速,结果准确可靠。 相似文献
11.
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
12.
13.
14.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
15.
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
16.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
17.
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
18.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
19.
20.
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