吸光光度法测定混合液中Fe^2＋及Fe^3＋和Ni^2＋的含量

1,10-邻菲罗啉在pH=3.9时与Fe~(2+)、Fe~(3+)形成稳定络合物,在pH=5.4时与Ni~(2+)形成稳定络合物,它们的最大吸收波长也不相同。利用吸光度的加和性,测定不同波长下的吸光度,联列方程组,用可见-紫外吸光光度法,可同时测定混合液中Fe~(2+)、Fe~(3+)和Ni~(2+)的含量。     

柱后衍生离子色谱法同时测定水中Fe^3＋,Fe^2＋,Cu^2＋,Zn^2＋方法研究

将Dionex 4000i离子色谱仪和国产721分光光度计组合联用,建立了一种同时测定水中Fe~(3+)、Fe~(2+)、Cu~(2+)、Zn~(2+)四种金属离子的柱后衍生离子色谱法。以磺基水杨酸/酒石酸/草酸为络合剂,质子化的二价乙二胺离子(EnH_2~(2+))为淋洗离子,在Dionex HPIC-CS2分离柱上先实现混合金属离子的分离,之后,各被分离的离子依次进入柱后反应器,与PAR在此反应显色生成有色络合物。借助国产721分光光度计,在500 nm的固定波长下依次检测流出的各离子。Fe~(3+)、Fe~(2+)、Zn~(2+)三种离子仅需6 min就可全部淋洗出。Cu~(2+)在切换淋洗液后检测,也仅需10 min。本法可用于同时测定天然水(mg/L级浓度)和电站高纯水(μg/L级浓度)以及金属腐蚀产物中的Fe~(3+)、Fe~(2+)、Cu~(2+)、Zn~(2+)。进样分析前,仅需将水样酸化和过滤即可。     

n—InP在Fe^3＋／Fe^2＋溶液中光脉冲暂态行为（Ⅳ）

研究了波长、温度及表面处理对ｎ－ＩｎＰ光脉冲暂态行为的影响。结果表明，波长对时间常数无影响；随着温度升高，峰值下降，衰减变快。讨论了表面处理的影响，并对实验结果作了必要的解释。     

A Novel Coumarin-based Fluorescence Chemosensor for Fe^3＋

A novel coumarin derivative[7-diethylamino-2-oxo-2H-chromene-3-carboxylic acid（6-amino-pyridin2-yl）-amide,CFe1] has been synthesized and its potential application as a chemosensor for the detection of metal ions has been further investigated.The responses of CFe1 to Fe^3＋ were studied by fluorescence emission spectrometry in the presence of other metal ions such as Al^3＋,Ba^2＋,Ca^2＋,Co^3＋,Cr^3＋,Cu^2＋,Fe^2＋,Hg^2＋,Mg^2＋,Mn^2＋,Na^＋,Ni^＋,Pb^2＋,Zn^2＋,K^＋,and Ag^＋.CFe1 showed a good selectivity for Fe^3＋ with fast response,a wide pH span of 3.3-9.18,and a large Stocks shift.CFe1 in the presence of Fe^3＋ and ethylene diamine tetraacetic acid（EDTA） makes the blue solution fade to colorless,which is due to the formation of CFe1-Fe^3＋ complex instead of any catalytic action of Fe^3＋.Furthermore,the imaging of Fe^3＋ in cultured single mice microglia cells was realized with the aid of CFe1,indicating that CFe1 has a great potential to be used as promising models for the future design of novel and robust chemosensor for metal ion detection in the field of biomedical and environmental analyses.     

Fe^3＋与S^2-反应再探究

Fe3 与S2-的反应一直是中学化学的敏感问题。若乱说,会谬种流传;若回避,会束之高阁,不利于化学教育的发展。1回顾回顾过去,大概有4种情型:笼统型?讨论型?否定型?回避型。1.1笼统型认为Fe3 与S2-反应是2Fe3 S2-=2Fe2 S↓,未考虑是否与滴加顺序有关。(1)梁大鹏主编的《高考三人     

补血灵胶囊中Fe^2＋／Fe测定

分别建立了测定补血是胶囊中Fe^2 和总铁(Fe)含量的分光光度法．方法灵敏、简便．并以Fe^2 、总铁(Fe)含量和Fe^2 ／Fe来控制本品的质量．     

阴离子交换树脂交换吸附盐酸溶液中Fe^3＋和Zn^2＋离子

测定了强碱性阴离子交换树脂201×7和弱碱性阴离子交换树脂D301从6NHCl溶液中交换吸附Fe~(3+)和Zn~(2+)的平衡交换容量和体积分配系数。当树脂床高1.0到1.4米、6NHCl溶液中Fe~(3+)～600毫克/升,Zn~(+2)～150毫克/升,流速为～3.3米/时时,强碱201×7对Fe~(3+)的工作容量约为21克/升。在用水再生强碱201×7时,Fe~(3+)的淋洗曲线峰比Zn~(2+)峰出现得早,且峰宽较窄。     

Layered Double Hydroxides with Hydrotalcite—type Structure Containing Fe^3＋,Al^3＋ and Mg^2＋

IntroductionLayered double hydroxides( LDHs) with hy-drotalcite ( HT ) - type structure are composed oftrivalent and divalent metal ions and have the gen-eral formula[1] ,[M2 + 1-x M3 + x ( OH) 2 ]x+ An-x/ n· m H2 O,where M3 + is a trivalentmental ion,such as Al3 + ,Fe3 + ,La3 + ,Ni3 + ,Mn3 + etc.,M2 + is a divalentmetal ion,such as Mg2 + ,Zn2 + ,Ca2 + ,Cu2 + ,Co2 +etc.,An-is a charge compensating anion,such asOH-,Cl-,NO-3 ,CO2 -3 etc.,m is the number ofthe moles of co- intercalat…     

磺化碳材料固载Fe^2＋催化甲基橙降解反应

以葡萄糖为原料制备的磺化碳材料作为Fenton反应过程中固体酸及载体,研究了磺化碳材料结构对Fe2+的负载能力及其对甲基橙降解反应的催化性能. 结果表明,直接加热法制备的磺化碳材料呈致密块状结构,对Fe2+几乎没有负载能力; 而水热法制备的磺化碳材料呈相互交联的纳米粒子,室温下对甲基橙表现出较好的降解性能(甲基橙降解率可达79%以上). 反应过程中溶液的pH=2.4～3.2, 在碳材料中引入 - SO3H基实现了固体酸代替液体酸的目的.     

间接紫外光度法测定食品添加剂乳酸亚铁中Fe^3^＋含量

基于Ｆｅ＾３＾＋能将抗坏血酸量氧化的特性，通过测定反庆前后体在紫外区２４５ｎｍ处吸光度值的差值，间接测定样品中Ｆｅ＾３＾＋的含量。试验结果表明，Ｆｅ＾３＾＋含量在０－２００μｇ／２５ｍＬ范围内服从比耳定律。应用于乳酸亚铁样品中Ｆｅ＾３＾＋含量的测定，回收率为９７．３％－１０１．７％，相对标准偏差为０．８％－２．７％。测定结果与标准方法基本一致。     

不同炮制条件对禹粮石Fe^2＋溶出率的影响

采用正交设计法和分光光度法对矿物中药禹粮石在何种炮制条件下其有效成分Fe^2 溶出率最高，进行了实验研究．根据实验结果，确认在A2B1C2(即690℃、10min、醅淬1次)的条件下．Fe^2 有最大程度的溶出．即选择该条件为禹粮石的合理炮制条件．     

利用Fe^3＋与SCN^—的显色反应检测内燃机车冷却液中的亚硝酸钠

1　引言内燃机车冷却液中NaNO2(18～22gL)的测定是采用KMnO4容量滴定法[1]。该方法重现性差、误差大[2]。作者改用稀乙酸调节冷却液酸度,以硫脲作还原剂,在波长476nm下[3]测其吸光度可求出NaNO2的含量。2　试验21　主要仪器和试剂752C型紫外可见分光光度计。标样(NaNO2标?..     

Fe^3＋—阳离子交换树脂催化剂的制备及其催化性能的研究

本文研究了高分子催化剂—Fe3+－阳离子交换树脂在苯的羟基化合成苯酚反应中的应用。本催化剂具有操作简便、无腐蚀性,催化剂易从反应混合物中分离,并能重复使用等优点。     

Researches on the Growth Habit and Optical Properties of Fe^3＋ Ion Doped KDP Crystal

During the process of KDP crystal growth,metal ions strongly affect the growth habit and optical properties of KDP single crystal. In this paper,KDP crystals were grown from an aqueous solution doped with different concentration of Fe3+ dopant by traditional temperature-reduction method and "point-seed" rapid growth method. Furthermore,we examined the light scatter and measured the transmission of these KDP crystals. It is found that the dopant of Fe3+ ion can improve the stability of the KDP growth solution when its concentration is less than 30 ppm. The effects of Fe3+ ion on the growth habit and optical properties of KDP crystal are also obvious.     

Synergetic Effects of UV／Fe^3＋ Combined with Electrocatalysis for p—Nitrophenol Degradation

Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes,UV/Fe^3 and electrocatalysis. The enhancement of removal rate for p-nitrophenol and COD was around 123% and 278%, respectively. The possible contributions for the synergetic effects were the electrochemically regeneration of ferric ion and the role of the oxygen that formed on the anode.     

渐进因子分析—分光光度法测定Fe^3＋—SCN^—络合物的稳定常数

本文利用渐进因子分析与化学平衡相结合的方法迭代求解逐级生成络合物的各级稳定常数，对Ｆｅ＾３＋－ＳＣＮ＾－体系在水溶液及５０％丙酮溶液中的配体浓度－波长的两维双线性吸光度数据矩阵进行处理，求得水溶液中该络合物第一、二级稳定常数为１ｇｋ１＝２．２６，１ｇｋ２＝１．３０。同时该法还可确定各种组分的存在区间及吸收光谱，本文还对丙酮的存在对Ｆｅ＾３＋－ＳＣＮ＾－络合物的影响作了研究，结果表明丙酮，对高配位络     

Preparation and Characterization of Nanotitanium Dioxide Coating Film Doped with Fe^3＋ Ions on Porous Ceramic

The nanotitanium dioxide （TiO2） photocatalytic and porous ceramic filtering technique is one of the advanced methods to effectively treat organic wastewater. The TiO2 sol doped with Fe^3＋ ions was prepared by sol-gel processing. The influences of the process conditions of coating nanophotocatalytic material- Fe^3＋-TiO2 film on the surface of porous ceramic filter by dipping-lift method on the performance of porous ceramic filter were studied. The porous ceramic filters have two functions at the same time, filtration and photocatalytic degradation. The results of this study showed that the pH and viscosity of the sol, amount of Fe^3＋ ions doped as well as the coating times greatly affect the quality of coating film, the performance parameters and the photocatalytic activity of the porous ceramic filter. When the pH of the sol is 3-4, the viscosity is about 6 mPa.S, the amount of doped Fe^3＋ ions is about 2.0 g/L, the porous ceramic filter has been shown to have the best filtering performance and photocatalytic activity. In this condition, the porosity of porous ceramic is about 42.5%, the pore diameter is 8-10μm. The degradation of methyl-orange is 74.76% under lighting for 120 rain.