铟(Ⅲ)-茜素红体系的吸附伏安法

本文对铟（Ⅲ）与茜素红络合物在悬汞电极上的吸附伏安法作了研究，确定了电极过程．在HAc－NaAc（PH4．92）缓冲溶液中有菌素红存在下，用1．5阶微分吸附伏安法测定铟，其线性范围是1×10－10～8×10－8mol／L，检测限5×10－11mol／L，用此法测定了化探样中痕量铟，结果良好。     

催化过氧化氢氧化杨梅红色素褪色光度法测定痕量锌

报道了杨梅红色素的提取与性质。基于加热条件下 ,Zn2 + 催化过氧化氢氧化杨梅红色素灵敏的褪色反应 ,提出了测定痕量锌的新方法。所建立的方法对Zn2 + 的线性范围为 0 .2～ 1 .0 μg L,并成功地用于发样和奶粉中锌的测定     

Design, synthesis, and micellar properties of bile acid dimers and oligomers linked with a 1,2,3-triazole ring

1,3-Dipolar cycloaddition of propargyl esters of bile acids to azide group attached at different positions of bile acids gave dimers, trimer, and tetramer linked with 1,2,3-triazole. These dimeric and oligomeric structures were able to solubilize hydrophilic dye—cresol red, in nonpolar solvent.     

The Radiolysis of Pyrogallol Red

 The radiolysis of pyrogallol red solution (PGR) by gamma radiation has been studied spectrophotometrically. The decrease in absorbance of the characteristic band of pyrogallol red at 490 nm and pH 4 gives a reproducible response and an accurate means of dosimetry for the dose ranges 0.02–1.5 kGy. Received January 3, 2001. Revision June 15, 2001.     

导数光谱法络合物稳定常数的测定

本文利用导数光谱法消除体系中共存有关物种干扰,直接测定游离配体浓度。基于此仿照对应溶液法的图解法,我们拟订两个测定络合物稳定常数的新方法。方法简便可靠,试用于La-BPR体系获得了令人满意结果。     

三乙醇胺活化钴（Ⅱ）催化过硼酸钠氧化荔枝红色素褪色光度法测定痕量钴

基于三乙醇胺活化钴（Ⅱ）催化过硼酸钠氧化荔枝红色素的褪色反应，提出测定痕量钻的高灵敏的催化光度法。其摩尔吸光系数ε５００＝１．８×１０７Ｌ·ｍｏｌ－１·ｃｍ－１；线性范围为０～０．４μｇ／Ｌ；工作曲线的回归方程为；相关系数ｒ＝０．９９９８；检测限１．０×１０－１３ｇ／ｍＬ。该褪色反应的表观活化能 Ｅ＝４２．１２ ｋＪ·ｍｏｌ－１，速率常数 ｋ＝１，６×１０－３·ｓ－１。此法用于血清、尿液等样品中钻的测定，结果满意。     

Effect of a surface charge on the halfwidth and peak position of cluster plasmons in colloidal metal particles

The optical response of colloidal particles depends on a variety of properties of the cluster, e.g., shape, size, size distribution and particle material. Since particles often are charged, also the surface charge may be a parameter which influences their optical properties. In this paper the effect of a surface charge on optical properties of spherical colloidal particles is studied and its magnitude is estimated by extended computations for silver clusters with surface plasmon in aqueous suspension. Two models are presented and discussed. The first model is based on the electrodynamic solution by Bohren and Hunt (Can. J. Phys. 55, 1930 (1977)), where a surface conductivity _S for a free surface charge yield an additional contribution _S to the dielectric constant of the particle material. In the second model, the surface charge contributes to the number density of free electrons in the cluster. Both models lead to a shift of the cluster plasmon peak, while an increase of the plasmon halfwidth could not be derived. The effect is quite small and limited on very small clusters.PACS 61.46+w 73.20.Mf 78.20.Dj     

用刚果红离子缔合负载形成树脂分离Rh,Ir,Pt,Pd,Au的研究

研究了锇铱矿的锇钌蒸残液中Ｒｈ、Ｉｒ、Ｐｔ、Ｐｄ、Ａｕ的分离条件。于ｐＨ１．０的ＨＣｌ介质中将贵金属吸附于刚果红负载形成树脂上，以分离贵贱金属。然后用０．５ｍｏｌ／ＬＨＣｌ洗脱Ｒｈ；３ｍｏｌ／ＬＨＣｌ洗脱Ｉｒ；０．５％的ＮａＳＣＮ－０．１ｍｏｌ／ＬＨＣｌ洗脱Ｐｔ；５ｇ／Ｌ硫脲－０．１ｍｏｌ／ＬＨＣｌ洗脱Ｐｄ；５０ｇ／Ｌ硫脲－０．１ｍｏｌ／ＬＨＣｌ洗脱Ａｕ。洗脱顺序是Ｒｈ＞Ｉｒ＞Ｐｔ＞Ｐｄ＞Ａｕ。这五种贵金属的回收率在９５％～１０１％之间。     

Immobilization of organorhenium(VII) oxides

In the last decade considerable progress has been made in research on organorhenium(VII) oxide catalysts, particularly with respect to methyltrioxorhenium(VII) (MTO). Heterogeneous systems have been developed with particular emphasis on the supporting systems including inorganic and organic carrier materials. As a result efficient and reasonably selective catalysts are now available for a variety of catalytic reactions like olefin epoxidation in particular and other oxidation reactions, metathesis, etc. Besides the MTO/UHP system, polymer supports for the organometallic catalysts are now also successfully applicable. The systems exhibit in several cases the required properties of stability, selectivity, activity and recyclability.