羧酸冠醚的合成

羧酸冠醚的合成吴琳，王志林，卞清，张进琪，朱春生（南京大学化学系南京２１００９３）曹建国（盐城师专化学系）关键词冠醚，离子迁移羧酸冠醚环上的羧基，对冠醚环的选择输送金属离子起着协同的作用。近十余年来，将羧酸冠醚选择萃取金属离子的能力应用于金属离子的液...     

Zn（Ⅱ）—Ag（Ⅰ）—组氨酸—H2O系配位平衡研究

Ｚｎ（Ⅱ）┐Ａｇ（Ⅰ）┐组氨酸┐Ｈ２Ｏ系配位平衡研究方福荣张祥麟郭学益（深圳蛇口商检局５１８０６７）（中南工业大学化学系长沙４１００８３）（中南工业大学冶金系长沙４１００８３）金属离子在水溶液中一般都不能以简单离子独立存在，而是与其它分子或离子（如Ｈ...     

Fe（Ⅲ）,Al（Ⅲ）,Mg（Ⅱ）,Ca（Ⅱ）的非有机溶剂萃取分离研究

Ｆｅ（Ⅲ）、Ａｌ（Ⅲ）、Ｍｇ（Ⅱ）、Ｃａ（Ⅱ）的非有机溶剂萃取分离研究邓凡政，石影，马丽华（安徽，淮北煤炭师范学院化学系２３５０００）水溶性高聚物的水溶液在无机盐存在下能分成两相￣［１］，文献［２］提出了用此现象分离金属离子的某些条件。利用高聚物水溶...     

用氧电极结合枯草杆菌M45（Rec~－）和H17（Rec~＋）快速鉴别金属离子的致癌性

用氧电极结合枯草杆菌Ｍ４５（Ｒｅｃ~－）和Ｈ１７（Ｒｅｃ~＋）快速鉴别金属离子的致癌性李辉，迪丽拜尔，邓家祺，陈中孚（复旦大学化学系，上海，２００４３３）（复旦大学遗传所）关键词遗传毒性，金属离子，枯草杆菌医学和生物学研究已证实某些金属离子如铬、镍等的...     

含羟基（巯基）的叔胺型螯合树脂的合成及吸附性能

含羟基（巯基）的叔胺型螯合树脂的合成及吸附性能倪才华（湖北荆州师范专科学校化学系荆沙４３４１００）徐羽梧（武汉大学化学系武汉４３００７２）关键词螯合树脂，巯基，吸附性能，贵金属已有研究表明：含硫氮的资合树脂对于贵金属离子有优良的吸附性能ｌ’一又Ｎ，Ｎ...     

值得一议的一道习题

值得一议的一道习题张黎明范冬梅（山西省吕梁高等专科学校化学系０３３０００）林树昌、胡乃非编《分析化学》（化学分析部分）第３９８页第１７题：有一含２０×１０－２ｍｏｌ／ＬＰｂ２＋和２０×１０－２ｍｏｌ／ＬＡｌ３＋的混合金属离子溶液，当其溶液ｐＨ６?..     

二乙胺苯丙酮的吸附伏安行为的研究

二乙胺苯丙酮的吸附伏安行为的研究谭学才，张升辉（湖北民族学院化学系恩施４４５０００）李启隆（北京师范大学化学系北京１００８７５）关键词二乙胺苯丙酮，吸附伏安法，不可逆吸附波二乙胺苯丙酮的商品名叫丽姿片（Ａｎｆｅｒｐｒａｍｏｎ，简称ＡＮＦ），是一种治疗...     

聚氯乙烯负载席夫碱树脂的合成及其对金属离子的吸附

聚氯乙烯负载席夫碱树脂的合成及其对金属离子的吸附刘理中，俞善信，肖立新（湖南师范大学化学系长沙４１００８１）（中南工业大学冶金化学研究所长沙）关键词聚氯乙烯，负载树脂．席夫碱，金属离子，吸附高分子负载席夫碱可用于离子吸附和催化等领域，汪信［１，２］等...     

水溶液中Cu^2＋,Zn^2＋双组分金属离子与胆固醇的相互作用

水溶液中Ｃｕ２＋、Ｚｎ２＋双组分金属离子与胆固醇的相互作用宋仲容（重庆高等师范专科学校化学系永川４０２１６８）李树伟（四川师范大学化学系成都６１００６６）关键词Ｃｕ２＋Ｚｎ２＋胆固醇吸附中国分类号Ｏ６１１．３铜锌金属离子在冠心病的发生与发展中有着重要...     

MVS法制备的PdZn／C燃料电池电极的性质

ＭＶＳ法制备的ＰｄＺｎ／Ｃ燃料电池电极的性质吴世华黄唯平朱常英阿力塔（南开大学化学系天津３０００７１）（内蒙古民族师范学院化学系通辽０２８０４３）碱性燃料电池（ＡＦＣ），作为一种清洁、有效、高能的电源，受到人们高度重视。ＡＦＣ研究的核心问题之一是改进...     

一种具有快速响应特性的光导纤维铁传感器

将邻氨基苯甲酸共价偶联到聚乙烯醇基质上,制得一个基于荧光碰撞猝灭机理的测定Fe^3^+的光导纤维化学传感器。此传感器响应速度仅为90ms,且可逆性好。用它测定铝合金中的铁含量,取得满意的结果。     

以Sephadex为基质的光纤铜传感器的研究

本文发展了一种新的光纤铜传感器, 用DEAE Sephadex为基质, 通过电价键固定亚硝基红盐作为指示剂, 该传感层在520nm波长下, 反射光强度的变化与铜离子的浓度呈函数关系。用流动法和平衡法对传感器特性进行了研究, 响应时间为5秒,且可逆性好, 已成功应用于自来水和废水中痕量铜离子的直接测定。     

A rapid and mercury pollution-free redoximetry determination of total iron in copper ore

A rapid and mercury pollution-free method for the determination of total iron in the presence of copper is described. The sample was decomposed either by an acid attack of hydrochloric acid-nitric acid (1 + 2) or by fusion with sodium peroxide. The ferric ion in the sample solution was amenable to direct reduction to ferrous ion with potassium borohydride in sulphuric acid medium under the catalysis of cupric ion, followed by titration with potassium dichromate using sodium diphenylaminesulfonate as an indicator. After reduction, the iron (II) in the solution was stable for 300 min. The proposed method is free of interference from copper and has been successfully used for the large-scale routine determination of total iron in copper ores showing the same or better degree of precision and accuracy as those obtained by the classic standard stannous chloride-mercuric chloride method with the separation of iron from copper.     

A Fiber-Optic iron Sensor with Deae Sephadex as a Substrate

Abstract

A fiber-optic sensor for iron (III) has been developed, based on the reflectance intensity change on DEAE sephadex at 460nm. The response time is 10 seconds, the sensor has good sensitivity as well as good reversibility.     

A flow-through fluorescent sensor to determine Fe(III) and total inorganic iron

A flow-through fluorescent sensor for the consecutive determination of Fe(III) and total iron is described. The reactive phase of the proposed sensor, which has a high affinity for complexed Fe(III), consists of pyoverdin immobilized on controlled pore glass (CPG) by covalent bonding. This pigment selectively reacts with Fe(III) decreasing its fluorescence emission. Total inorganic iron is determined as Fe(III) after on-line oxidation in a mini-column containing persulphate immobilized on an ion exchange resin. The developed method allows the determination of Fe(III) in the 3-200 (g l(-1) range. The relative standard deviations of 10 determinations of 60 (g l(-1) of Fe(III) and 20 (g l(-1) of Fe(III)+Fe(II) are 3 and 5%, respectively. The sensor has been satisfactorily applied to speciate iron in synthetic, tap and well waters and wines. There were no significant differences for total inorganic iron determination between this new method and the atomic absorption spectroscopy reference method at the 95% confidence level. The sensor allows the concentration of Fe(II) to be calculated as the difference between total inorganic iron and Fe(III). The lifetime of the sensor is at least 3 months in continuous use or the equivalent of 1000 determinations.     

An optical reflected device using a molecularly imprinted polymer film sensor

A novel and highly selective optical sensor with molecularly imprinted polymer (MIP) film was fabricated and investigated. The optical sensor head employing a medium finesse molecularly imprinted polymer film has been fabricated and characterised. A blank polymer and formaldehyde imprinted polymer were using methacrylic acid as the functional monomer and the ethylene glycol dimethacrylate as a crosslinker. The transduction mechanism is discussed based on the changes of optical intensity of molecularly imprinted polymer film acting as an optical reflected sensor. Template molecules, which diffused into MIP, could cause film density, and refractive index change, and then induce measurable optical reflective intensity shifts. Based on the reflective intensity shifts, an optical reflection detection of formaldehyde was achieved by illuminating MIP with a laser beam. For the same MIP, the reflective intensity shift was proportional to the amount of template molecule. This optical sensor, based on an artificial recognition system, demonstrates long-time stability and resistance to harsh chemical environments. As the research moves forward gradually, we establish the possibilities of quantitative analysis primly, setting the groundwork to the synthesis of the molecular imprinted optical fiber sensor. The techniques show good reproducibility and sensitivity and will be of significant interest to the MIPcommunity.     

Solvent extraction of Fe(III) by di-(2-ethylhexyl)phosphoric acid from phosphoric acid solutions

The extraction of iron(III) from aqueous phosphoric acid was studied using di-(2-ethylhexyl)phosphoric acid and trioctylphosphine oxide in nonaromatic hydrocarbon diluent. Distribution ratios have been investigated as a function of concentration of iron(III), phosphoric acid concentration, extractant concentration and extraction temperature. The apparent enthalpy change for the extraction reaction has been calculated from the temperature dependence data. It was found that the extractant dependency for iron(III) is first power indicating hydrolysis of iron(III) in the aqueous phase.     

甲壳素色谱柱富集—快速吸光光度法测定环境试样中痕量铁

研究了甲壳素色谱柱富集Fe(Ⅱ)-磺基水杨酸-十八烷基二甲基氨基乙酸的红紫色缔合物,用磺基水杨酸洗脱后,在分光光度计上直接测定洗脱液的吸光度,方法快速,简单、富集倍数高,用于环境水样中痕量铁的测定,结果令人满意。     

An automatic flow-injection analysis system for determining phosphate ion in river water using pyruvate oxidase G (from Aerococcus viridans)

An automated flow-injection system combining a pyruvate oxidase reaction and chemiluminescence for the detection of phosphate ion in river water has been developed. In this research, we used pyruvate oxidase G (PyrOxG), from Aerococcus viridans, immobilizing it on N-hydroxysuccinicacidimido beads without a cross-linker. In this sensor system, which was constructed as a trial system of desktop type, the temperature was precisely controlled. After the sensor system was optimized, a calibration curve was obtained with a detection limit of 96 nM phosphate ion, a range between 96 nM and 32 microM phosphate ion, and a relative standard deviation of 2.3% (n=5) at 25 degrees C. The sensitivity of this sensor was sufficient to determine the maximal permissible phosphate-ion concentration in the environmental waters of Japan (0.32 microM). In addition, the sensor could determine the calibration curves between 0.16 and 32 microM phosphate ion (five points, n=3; averaged correlation, r=1.00) for at least 2 weeks, demonstrating enough stability for practical use. Furthermore, we investigated the influence on the sensor response of dissolved substances in river water such as metal ions, heavy metal ions, inorganic ions, and organic compounds. Treatment with activated carbon could improve the response of the sensor when inhibited by dissolved substances in river water, except for manganese ion and uric acid. The sensor system could determine the concentrations of phosphate ion in various samples of river water from the Tone River. The results obtained by this sensor system and the modified molybdenum blue method were compared, and good correlation (r=0.94) was obtained.     

Immunosensor Based on Surface Plasmon Resonance for Antigen Recognition

A novel immunosensor based on surface plasmon resonance（SPR） has been developed for the recognition of antigen. The sensor was designed on the basis of the fixed angle of incidence and measuring the reflected intensities in a wavelength range of 430--750 nm in real-time. An ultra-bright white light-emitting diode（LED） was used as the light source. Molecular self-assembling in solution was used to form the sensing membrane on gold substrate. It has been seen that the sensitivity of the SPR sensor with 3-mercaptopropionic acid（MPA）/protein A（SPA） sensing membrane is considerably higher than that with MPA or SPA modified sensing membrane. The kinetic processes on the sensing membrane were studied. The human B factor（Bf）, an activator of complement 3（C3）, was recognized among the other antigens. This sensor can also be used for other antigen/antibody or adaptor/receptor recognition. Under optimized experimental conditions, the sensor has good selectivity, repeatability, and reversibility.