1—（5—硝基—2—吡啶偶氮）2，7—萘二酚吸光光度法测定微量钴

报道了 1 (5 硝基 2 吡啶偶氮 ) 2 ,7 萘二酚与钴的显色反应 ,结果表明 ,在Tween 80存在下 ,pH 5 .2 6.5时试剂与钴形成稳定的蓝色配合物 ,其最大吸收波长位于 63 5nm ,表观摩尔吸光系数为 6.44× 10 4 L·mol- 1·cm- 1,配合物中钴与试剂的组成比为 1∶2 ,钴浓度在 0 5 μg/10ml范围内服从比耳定律。方法用于标准钢、金川精矿等试样中钴的测定 ,结果满意。     

La(Ⅲ)、Eu(Ⅲ)与HBED配合的紫外差光谱研究

在0.01mol·L     

甲苯硝基衍生物的研究进展

在这篇文章中,首先综述了甲苯硝基衍生物研究的进展,根据这一评论详细地说明了化学转化机理和取代基效应,并对硝基甲苯的选择性氧化进行了简单评述。     

The Aggregates in LB Films of Schiff base Aluminium (III) Complex

Metal complexes, which are composed of metal ions and amphiphile ligands, show some structural peculiarities in Langmuir-Blodgett (LB) films. In the past studies, the metal complexes were mainly composed of the transitional metal ions1,2. The metal ions in IA, IIA and IIIA were seldom mentioned. Further more, the aluminium element is at the position where the typical metal elements transit to the typical non-metal elements in the periodic table of elements and study on the properties of …     

ABO3钙钛矿型复合氧化物光催化活性与B离子d电子结构的关系

在ABO₃钙钛矿型复合氧化物中,B离子的d电子结构对B_3d-O_2p之间的电荷转移能ΔCT及B-O之间的结合能起着关键作用,是影响ABO₃复合氧化物光催化活性的一个重要因素.本文以研磨法和柠檬酸法合成了系列LaBO₃(B=Ti-Co),并结合光催化降解实验和光声光谱图分析得出:LaBO₃光催化活性随B离子3d电子数的递增而逐渐增加.     

A Study on the Color Reaction of Nickel with a New Chromogenic Reagent 1- (5-Nitro-2-Pyridylazo) - 2.7 - Dihydroxy - naphthalene and its Application

There has been study on heterocyclicazo reagent for the determination of microamount of nickel,but no study on the color reactron of nickel with a new chromogenic reagent 1- (5 -nitro - 2 - pyridylazo) - 2.7 - dihydroxy - naphthalene (5- NO₂ - PADN). So, here is a systematic study on condition under which the color reaction takes place. It proved that within PH 5.5~6.5,the maximnm absotption of the reagent lies at 460nm, that of the 2:1 turquoise chelate by 5 - NO₂ - PADN with nickel (Ⅱ) together is 650nm, and the apparent absorptivity is 1.02×10⁵ L · mol^-1 · cm^-1. The proposed method can be applied in the standard steel and the determination of microamounts of nickel in ore with satisfactory results.     

Synthesis of l-(5-Nitro-2-Pyridylazo)-2.7-Dihydroxy-naphthalene and its Color Reaction with Cobalt (Ⅱ)

Pytrdylazo reagent is an important chromogenic reagent. PAN is typical one. The new reagent, l-(5-nitro-2-Pyridylazo)-2.7-dihydroxy-naphthalene (5-NO₂-PADN) has been synthesized by to take up -OH and -NO₂ groups at the PAN, and it was confirmed with IR and elements analysis.     

Studies On Spectroscopy of RE Complexes and Their LB Films

Two series of amphiphilic rare earth complexes are synthesized through molecular design and chemical modification of organic ligands.     

Determination of Chlorine Ion Constant in Magnesite by the Microcoulome Method

Magnesite is widely used in industry and agriculture. In the clauses of some foreign trade contract, it is one of the important inspecting terms to determine Cl^- content (generally, C1^- content ≤ 0.01%). So far, there is no any good analysis standard and method. In this paper, We present a new and easy method to determine the low content of chlorine ion by microcoulome method. The experiment results show that the method is reliable, fast, and the determining range it can be used for is 0.0002%-1%.     

TiO2纳米粒子膜的表面态性质及其光催化活性的研究

TiO₂纳米粒子膜催化剂光催化降解水中污染物,与粉末相比具有可重复使用、易回收等优点,近年来,在光化学领域受到人们的高度重视^[1～3].膜催化剂的表面性质与其光催化活性直接相关,研究这些性质能够为研制、开发高效催化剂提供理论依据.本文采用TiCl₄水解法,制备了酸性、碱性条件下TiO₂纳米粒子膜.利用原子力显微镜(AFM)、X-射线衍射谱(XRD)、红外光谱(IR)和场诱导表面光电压谱(EFISPS)测定其表面微结构.考察了它们对苯酚降解的光催化活性,讨论了膜催化剂的表面性质对光催化活性的影响.