流动注射化学发光法测定芦丁

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.     

流动注射化学发光法测定氧氟沙星

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.     

高锰酸钾-H_2SO_4-安乃近化学发光体系的研究

在酸性溶液中,高锰酸钾可直接氧化安乃近,产生很强的化学发光,由此建立了一各测定安乃近的流动注射化学发光分析法．方法的检出限为3．1×10-8g／mL,相对标准偏差为1．8％（6．0×10－6g／mL安乃近,n＝11）,线性范围为1．0×10－7～1．0×10-4g／mL,此法已用于安乃近针剂和片剂中安乃近含量的测定．并对该反应的机理进行了探讨．     

鲁米诺-铁氰化钾化学发光体系测定异丙嗪

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%.     

高锰酸钾-甲醛-S2-化学发光反应的研究

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-.     

NaIO4-VB2化学发光反应体系测定维生素B2

利用建立的NaIO4-H+-H2O2-VB2化学发光新体系,结合流动注射技术建立起一种测定维生素B2的化学发光新方法.方法的线性范围为1.0×10-7～5.0×10-5g/mLVB2;检出限为2.7×10-8g/mL;相对标准偏差(RSD)为2.3%(Cs=1.0×10-6g/mLVB2,n=11).     

合金钢、铁合金中微量硼的测定

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 .     

高锰酸钾-鲁米诺-流动注射化学发光测定山奈酚

在NaOH介质中,山奈酚对KMnO4-luminol体系的化学发光有增敏作用,据此采用流动注射技术,建立测定山奈酚的化学发光新方法。该法测定山奈酚的检出限为1.2×10-8g.mL-1,线性范围为8×10-8～1×10-5g.mL-1,对1×10-6g.mL-1山奈酚进行了11次平行测定,其RSD为3.8%。考察了影响该体系发光强度的因素,该法用于合成样品中山奈酚的测定获得满意结果。     

电化学分离富集抑制铜化学发光法测定汞的研究

在流通体系中于-0.2V(相对于AgCl/Ag电极)电位下把试样中的汞富集在工作电极上,于+0.35V电位下使富集的汞在Luminol-CN--Cu2+溶液中溶出,溶出的汞使Luminol-CN--Cu2+溶液化学发光强度减弱,化学发光减弱程度与汞浓度成正比,据此测定Hg2+浓度. 本法的选择性较好,检出限为3.3×10-10g/mL,线性范围为1.0×10-7～1.0×10-9g/mL,对1.0×10-7g/mL的汞七次平行测定的相对标准偏差为2.9%,成功地用于雨水和井水中汞的测定.     

流动注射偶合反应化学发光测定亚硝酸根的研究

本文将亚硝酸根在酸性介质中催化溶解氧氧化Fe~(2+)的反应与Fe~(2+)-Luminol-O_2化学发光反应相偶合,利用流动注射技术,建立了一个痕量亚硝酸根的化学发光测定新方法。该方法检出限为:8×10~(-8)g/L亚硝酸根,亚硝酸根浓度在2×10~(-7)～2×10~(-4)g/L范围内与体系化学发光强度减小量呈良好线性;RSD为2.1％(C=5×10~(-6)g/L,n=7)。方法用于水样中亚硝酸根的测定,效果满意。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

Western and Eastern culture differences in commercial field

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.     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

风的曲线

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.     

团图为数的图中的闭团贯数

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.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.