铁强化酱油与补铁工程

酱油铁强化是国家营养改善项目的一部分,旨在改善我国人口铁营养缺乏状况和控制缺铁性贫血。质量稳定、可接受性好的EDTA铁钠强化酱油,已进入推广应用阶段。其中EDTA铁钠是一种新型食品添加剂和铁的强化剂,本文介绍了其结构、理化性质及生物利用率等,指出了推行铁强化酱油对改善国家公众营养、增进国民健康的意义。     

利用智能手机测定补铁药物中的铁含量*

为进一步提升图像比色法测定补铁药物中铁含量的准确性及普适性,考察了拍摄环境对结果的影响,确定了适用于图像比色分析的定量参数,比较使用不同容器来盛装溶液所获得的比色结果,在最优条件下测定了实际样品中铁的含量及加标回收率。结果显示,获得可靠数据的关键是将标准溶液、待测液以及空白溶液拍摄在同一张图片上;由溶液图像R值换算的吸光度值与浓度具有最佳的线性关系;分析以比色皿、试管、点滴板为容器获得的溶液图片,都能得到适合于定量比色分析的数据;测定的加标回收率大于95%。该方法操作简便,测定结果准确,可在各种条件下的高中化学实验室中开展。     

食物中可溶性铁和可吸收铁的测定

为了评价食物中可被吸收利用的铁的量，采用体外法模拟人体胃肠道的消化吸收，考查了八种不同食物的可溶性铁、可吸收铁和铁的可利用率、铁的可吸收率，它们分别在０．００６×１０－３～０．１７６×１０－３、０．２４×１０－６～３．０９×１０－６、４．０８％～３８．４６％和０．１１％～１．６６％之间。发现摄食相同重量的黑木耳、紫菜或空心菜，可以获得比猪肝或菠菜更多的可吸收铁；就可吸收率而言，蔬菜类食物高于豆制品类食物，富含动物蛋白的食物高于它含植物蛋白的食物。     

Iron arsenate frameworks

Six new iron arsenate framework structures, Fe(2)As(2)O(7) x 2H(2)O, [Fe(6)As(8)O(32)H(4)](2-)(1,4-butanediamininium(2+)) x 2H(2)O, [Fe(4)As(6)O(22)H(2)](2-)(piperazinium(2+)), [Fe(5)As(5)O(24)H(4)](2-)(piperazinium(2+)) x 2H(2)O, [Fe(6)As(7)O(31)H(5)](2-)(dabco(2+)) and LiFeAsO(4)OH have been synthesised under hydrothermal conditions. Incorporation of the amine cation templates leads to more open framework geometries and, in contrast to iron phosphates which have topologies based on PO(4) tetrahedra, the iron arsenate structures typically contain protonated As(O,OH)(4) units. The magnetic properties of the iron arsenates studied show Curie-Weiss behaviours with maxima in the chi(T) vs.T plots in the range 10-50 K.     

Iron monoxide photodissociation

The photodissociation of (56)FeO was studied by means of the velocity map imaging technique. A molecular beam of iron atoms and iron monoxide molecules was created using an electrical discharge with an iron electrode in a supersonic expansion of molecular oxygen. The ground state iron atom Fe((5)D(4)) and FeO concentrations in the molecular beam have been estimated. The dissociation energy of the FeO X (5)Delta ground electronic state was found to be D(0) (0)(FeO)=4.18+/-0.01 eV. The effective absorption cross section of FeO at 252.39 nm (vac), leading to the Fe((5)D(4))+O((3)P) dissociation channel, is approximately 1.2 x 10(-18) cm(2). A (1+1) resonantly enhanced multiphoton ionization spectrum of (56)FeO in the region 39 550-39 580 cm(-1) with rotational structure has been observed, but not assigned. Angular distributions of Fe((5)D(4)) and Fe((5)D(3)) products for the channel FeO-->Fe((5)D(4,3))+O((3)P) have been measured at several points in the 210-260 nm laser light wavelength region. The anisotropy parameter varies strongly with wavelength for both channels.     

Iron ore sintering

Differential scanning and high temperature reaction calorimetry have been used to characterize a series of natural iron ore and flux samples commonly used during iron ore sintering. Most iron ore samples were shown to contain measurable quantities of goethite, with a characteristic dehydration peak in DSC and TG between 200 and 400°C. At higher temperatures, all samples decomposed to produce magnetite with an accompanying mass loss in the TG profile due to the evolution of oxygen. High temperature reaction calorimetry has been used to measure the heat of solution of the ore in the melt formed during iron ore sintering. The dehydration and calcination of iron ore and flux samples was also examined using high-temperature reaction calorimetry. The results support the DSC/TG findings.     

可调铁三脚架

可调铁三脚架是在原铁三脚架构造的基础上,将其中的一个铁脚向上延长一倍,延长部分a用螺丝灵活地固定在铁三脚架的铁圈B上(该延长部分可灵活地安上或取下),另用一铁圈A通过固紧螺丝套在铁脚或延长部分上,可上、下作无级调节移动。铁圈A用于放置酒精灯,以达到对酒精灯火焰加热高度的无级任间调节,为便于受热试管或玻璃管的倾斜,在铁圈B上开一小缺口,。即可任意倾斜。     

从废铁屑电解制备纯铁及其腐蚀特性

以工业废铁屑作原料制备高纯度电解铁,并优化了在氯化物溶液中的电解工艺条件,所得样品纯度最高可达到99.983%.通过SEM断面形貌观察,该电解铁样品非常致密.交流阻抗及腐蚀速率测定表明,电解铁的纯度越高,其耐腐蚀性能越好.     

数码成像比色法测定补铁剂中铁元素含量的实验研究

利用数码成像原理,使用手机拍照,并用Photoshop 7.0软件处理图片得到标准溶液图片的灰度值,绘制标准曲线,进而测定补铁剂中铁元素的含量。本实验操作简便,用时短,精确度高。在中学引入数码成像比色法,不仅可以扩展定量实验的范围,还能凸显数码分析技术在化学学科中的应用,适合高中阶段开展特色兴趣实验。     

O-Tolyldithiocarbonate Complexes of Iron(II) and Iron(III)

Abstract

Reactions of O-tolyldithiocarbonate ligands, (o-, m-, and p-CH₃C₆H₄O)CS₂Na, with anhydrous FeCl₂ (1:2 molar ratio) and with FeCl₃ (1:1 and 1:3 molar ratio) yielded the complexes [{(CreO)CS₂}₂Fe] and [{(CreO)CS₂}_nFeCl_3–n] (Cre = o-, m-, and p-CH₃C₆H₄; n = 1 and 3), respectively. These complexes were reacted with nitrogen and phosphorus donor ligands in dichloromethane, which afforded the adducts corresponded to [{(CreO)CS₂}₂Fe.xL] and [(CreO)CS₂FeCl₂.xL] {x = 1, L = N₂C₁₂H₈; x = 2, L = NC₅H₅, P(C₆H₅)₃}. Elemental analyses and IR, UV-visible, and mass spectroscopic and magnetic studies indicated bidentate mode of bonding by dithiocarbonate ligands leading to sixcoordination around the iron atom as a consequence of Fe…Fe interaction in the complexes [{(CreO)CS₂}₂Fe] and [(CreO)CS₂FeCl₂]. The complexes exhibited antifungal activity. The fungicidal activity of the complexes has been tested by poisoned food technique using fungi Fusarium sp.

Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental resource: Antifungal Activity.     

硫铁矿烧渣制备氧化铁黄和氧化铁红

对利用硫铁矿烧渣制备氧化铁黄和氧化铁红进行了研究。考察了影响硫铁矿烧渣还原、酸溶、中和、氧化等过程的各种因素。结果表明,在适宜的条件下,利用烧渣可以制备出用做颜料的氧化铁黄和氧化铁红。     

Single-Atom Iron Boosts Electrochemiluminescence

The traditional luminol–H₂O₂ electrochemiluminescence (ECL) sensing platform suffers from self-decomposition of H₂O₂ at room temperature, hampering its application for quantitative analysis. In this work, for the first time we employ iron single-atom catalysts (Fe-N-C SACs) as an advanced co-reactant accelerator to directly reduce the dissolved oxygen (O₂) to reactive oxygen species (ROS). Owing to the unique electronic structure and catalytic activity of Fe-N-C SACs, large amounts of ROS are efficiently produced, which then react with the luminol anion radical and significantly amplify the luminol ECL emission. Under the optimum conditions, a Fe-N-C SACs–luminol ECL sensor for antioxidant capacity measurement was developed with a good linear range from 0.8 μm to 1.0 mm of Trolox.     

Iron oxide pillared graphite

We show that alpha-Fe2O3- and Fe3O4-pillared graphites can be prepared by pillaring graphite oxide with trinuclear iron acetato complex ion and calcining it in air and in vacuo, respectively. A pillared graphite structure is confirmed by transmission electron microscopy observations. The adsorption isotherms of water indicate that the mesopores of Fe3O4-pillared graphite constitute a hydrophobic nanospace.     

Iron Oxidation byThiobacillus ferrooxidans

Applied Biochemistry and Biotechnology - Results of the parametric study of factors affecting ferrous iron oxidation show that the maximum conversion rate, which corresponds to the relative...     

能量色散型X荧光分析仪测定生铁样品

目前 ,国内钢铁企业生铁样品分析大多采用传统的化学分析方法 ,分析速度慢 ,难以满足生产需要 ,部分企业采用进口的波长色散型X荧光分析仪 ,但因其价格昂贵 ,很多企业难以接受。而采用能量色散型X荧光分析仪 (简称EDXRF)测定生铁样品 ,国内还未见报道。本文试验了国产X荧光仪分析生铁样品的方法 ,成功地应用于炼铁化验室生产分析 ,为国内炼铁化验手段的更新换代作了有益的探索。1　试验部分1.1　仪器及性能WISDOM 80 0 0型能量色散X荧光分析仪 (上海精谱仪器有限公司 )分析范围 :同时分析元素周期表中由钠到铀之间的全部元素。高压发…