共查询到20条相似文献，搜索用时 828 毫秒
1.
流动注射化学发光法测定L-色氨酸 总被引：1，自引：0，他引：1
在酸性溶液中 ,高锰酸钾能氧化L_色氨酸产生化学发光反应 ,甲醛的存在可使化学发光强度增强 .据此 ,采用流动注射技术 ,建立了一种测定L_色氨酸的化学发光分析法 .方法的检出限为 3 5× 10 - 8g/mL ,相对标准偏差为 1 8% (1 0× 10 - 6 g/mLL_色氨酸 ,n =11) ,线性范围为 1 0× 10 - 7～ 6 0× 10 - 6 g/mL 相似文献
2.
流动注射化学发光法测定芦丁 总被引：2，自引：0，他引：2
提出使用芦丁增强KMnO4-NaOH化学发光体系,结合流动注射分析技术进行芦丁的测定.本法选择性好、灵敏度高.芦丁在1 0×10-7～5 0×10-5g/mL浓度范围内与化学发光分析信号呈线性关系;检出限为7×10-8g/mL;对5 0×10-6g/mL的芦丁进行11次连续测定,相对标准偏差为2 5%.方法已成功地应用于片剂中芦丁含量的测定. 相似文献
3.
在亚硫酸钠存在下,高锰酸钾与奎宁、奎尼丁等能够发生化学发光反应,产生很强的化学发光,由此建立了测定奎宁、奎尼丁的化学发光分析法．方法的检出限分别为 3．2×10－7g/mL奎宁、2．1×10－7g/mL奎尼丁,相对标准偏差分别为1．6％（8．0×10－6g/mL 奎宁,n＝11）,2．1％（8．0×10－6g/ml。奎尼丁,n＝11）,线性范围分别为1．0 × 10－6～6,0 × 10－4g／mL奎宁,1．0 × 10－6～6．0 × 10－4 g/mL奎尼丁．该法可用于复方奎宁注射液中奎宁含量的测定． 相似文献
4.
流动注射化学发光法测定氧氟沙星 总被引：1，自引：0，他引：1
瞿鹏 《商丘师范学院学报》2003,19(2):83-85
提出使用氧氟沙星增强KMnO4-NaOH化学发光体系,结合流动注射分析技术进行氧氟沙星的测定.该法选择性好、灵活度高.氧氟沙星在5.0×10-7～2.0×10-5g/mL浓度范围内与化学发光分析信息号呈线性关系;检出限为8×10-8g/mL;对5.0×10-6g/mL的氧氟沙星进行11次连续测定,相对标准偏差为2.5％.方法已成功地应用于胶囊中氧氟沙星含量的测定. 相似文献
5.
在碱性条件下,铁氰化钾能氧化鲁米诺产生化学发光,异丙嗪对该体系的化学发光有显著的增强作用。基于此,结合流动注射技术,建立了测定异丙嗪的化学发光新方法。该方法具有很高的灵敏度,检测限为5.7×10-9g/mL(IUPAC),线性范围为1.0×10-8～1.0×10-6g/mL,对1.0×10-7g/mL异丙嗪平行测定11次,其相对标准偏差为2.9%. 相似文献
6.
利用姜黄素在强酸非水介质中与硼酸生成有色络合物测定微量硼 ,并进行比色测定 ,方法检出限为 7 7× 10 - 8g mL ,相对标准偏差为 0 5 9% (3 3× 10 - 7g mL ,姜黄素 ,n =10 ) ,线性范围 :2 0× 10 - 7～ 1 2× 10 - 6g mL . 相似文献
7.
高锰酸钾-甲醛-S2-化学发光反应的研究 总被引：1，自引：0，他引：1
何云华 《陕西理工学院学报(社会科学版)》2001,19(6):59-61
甲醛存在的条件下,酸性溶液中高锰酸钾可以氧化S2-产生很强的化学发光.据此,采用流动注射技术,建立了利用高锰酸钾-甲醛-S2-化学发光体系测定硫的化学发光分析法.方法的检出限为2.3×10-8g/mL,相对标准偏差为1.2%(6.0×10-7g/mL S2-,n=11),线性范围为1.0×10-7～1.0×10-5g/mL S2-. 相似文献
8.
提出了异烟肼一次氯酸钠化学发光新体系．结合流动注射技术，建立了一种新的测定异烟肼的流动注射化学发光新方法．该法选择性较好，操作简单，精密度好试剂易得．异烟肼在1．0×10－6～1．0×10－4g·ml－1浓度范围内与化学发光信号强度呈线性关系．检出限为2．7×10－7g·ml-1．RSD=2．4％（n＝11；Cs=5．0×10－6g·ml－1）． 相似文献
9.
本文用伏安法对药物中的维生素B6（VB6）进书测定。在0．05mol／L（CH3）4NBr－（CH3）4NOH底液中（pH-6．0～11．0），VB6在-1．88V（VS，SCE）产生一灵敏还原峰，峰高与VB6浓度在8．0×10-7～2．2×10－5mol／L范围内成线性关系，检测下限为2．0×－7mol／L，用本法，可直接测定药物中VB6的含量。 相似文献
10.
流动注射化学发光法测定盐酸利多卡因 总被引：1，自引：0，他引：1
在碱性介质中,当把鲁米诺和KMnO4的混合溶液注入到盐酸利多卡因溶液中时,会产生很强的化学发光现象．由此结合流动注射技术,建立了测定盐酸利多卡因的流动注射化学发光新方法．在优化的实验条件下,测定盐酸利多卡因的线形范围为1．0×10^-7～1．0×10^-5g／mL,检出限（3or）为4×10^-8g／mL,对1．0 ×10^-6g／mL的盐酸利多卡因进行11次平行测定,其相对标准偏差为0．25％．该方法已用于盐酸利多卡因注射液中盐酸利多卡因的测定． 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
14.
15.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
16.
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
17.
《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
19.
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
20.
Anton Franks 《English in Education》1999,33(2):39-49
This paper looks at the way drama works to bring a model of an arts curriculum into reality. He also shows how drama is valuable when discussed as a separate, autonomous subject in the school curriculum as opposed to one subsumed within English. He argues for a view of the arts and gives an example of a sequence of work in an English GCSE class based around Arthur Miller's play View from the Bridge. From this he draws out several strands about the relationship of the drama curriculum to the individual students and teachers, the school, and to culture. He also emphasises the primacy of performance in drama education. 相似文献