纳米银修饰的压电晶体传感器用于水中痕量氰化物测定的研究

以压电石英晶体(PQC)技术为基础,研究了光化学方法沉积纳米银粒子到PQC电极表面的过程及机理.将该电极用于检测水中痕量的氰化物,与普通商品PQC的银膜相比, 这种新鲜产生的金属纳米银传感层可改善分析性能(检测信号加强3倍).结果显示该PQC电极频率的变化与氰化物的浓度在0.1 ～10 μmol/L范围内呈线性关系, 检出限(2.2 μg/L)较世界卫生组织(WHO)对饮用水氰化物含量的指导值低1 ～2个数量级.详细研究了光化学沉积银过程中的各种影响因素以及检测氰化物过程中的主要影响因素:纳米银粒子的大小及涂层厚度、背景缓冲溶液、pH及样品中共存物质的干扰等.     

水中微量氰化物的测定方法：———异烟酸—巴比妥酸主次波长光度法

根据异烟酸－吡唑啉酮和吡啶－巴比妥酸光度法测定水中氰化物的基本原理，将二者重新组合成异烟酸－巴比妥酸体系，采用主次波长光度法测定。该法具有室温显色，显色所需时间较短，有色溶液稳定，对环境污染小，灵敏度高等优点，其最低检测限为０００１ｍｇ／Ｌ。特别适合于饮用水、生活污水、工业废水中微量氰化物的测定。通过对实际样品分析，与原方法进行比较，结果令人满意。     

饮用水中挥发酚测定方法的改进

目前生活饮用水挥发酚的标准检验方法均采用4-氨基安替比林氯仿萃取光度法，方法采用铁氰化钾作氧化剂，操作过程中产生氰化物污染环境，本文用碘作氧化剂，在硫化氢和二氧化硫含量甚微的情况下，可以不用蒸馏，直接测定方法简单，结果满意。     

反相流动注射光度法测定矿物浸提液中的游离氰根

１引言以游离氰化物对铜氨络离子的褪色作用来测定游离氰化物的常规流动注射分光光度法已有报道，在生产现场样品量充足，采用反相流动注射分析（ｒＦＬＡ）技术并联用单片机，不仅可以大大节约试剂，而且可以实现程序化自动化操作，节约时间，提高工效，充分体现ＦＬＡ快速分析的特点。这对于生产中所需的在线监测和过程控制是特别适用的。２实验部分２．１仪器装置及参数蠕动泵（自组装）；ＭＣＳ－４８自动采样阀（温州龙方仪器配件厂）；７２１型分光光度计（上海第三分析仪器厂）；ＸＷＴ－１００型台式自动平衡记录仪（上海大华仪表厂…     

Iodine Catalyzed Three-component Strecker-type Synthesis of α-Aminonitriles from Aldehydes, Amines and Tributyltin Cyanide

A simple and efficient one-pot method has been developed for the synthesis of a-aminonitriles from aldehydes, amines and tributyltin cyanide in the presence of a catalytic amount of iodine with high yields. The reactions proceeded smoothly at room temperature via very simple procedure.     

三维异双金属混合桥氰化物的合成和结构

高Tc分子磁体的研究近年来受到重视，其中尤以双过渡金属氰化物的研究发展异常迅猛．继Verdaguer[1]报道了Tc=90K的CsNi[Cr（CN）6]2·H2O配合物后，Verdaguer[2]和Girlami等[3]又分别报道了一系列TC=240、230、190K的同或异双过渡金属含CN配合物．Fujishima等[4]报道的具有磁光效应的K0.2Co1.4[Fe（CN）6]·6.9H2O配合物使分子磁性应用于分子电子学领域成为可能．但上述化合物均为粉末，未能获得其晶体结构，因此无法阐明其磁交换机理，亦难以发展成为晶须及其它异型磁性材料．为弄清混合金属氰化物成键性质、CN桥中介磁交换机…     

涂丝Ag-Ag2S电极测定水体中微量氰化物的研究

本文报道了涂丝Ag-Ag2S电极测定水体中微量氰化物(CN-)的分析方法。该方法对现用的Ag(CN)2-指示剂配制方法以及使用浓度作了新的改进,加之成功地在ISAB中引入有机溶剂等,较大程度地提高了测定CN-的灵敏度。该方法测定CN-的线性范围为1.0×10-3～1.0×10-7mol/L,检出限可达4.0×10-8mol/L,标准偏差小于0.015,回收率为99%～104%。本方法与比色法对照,相对误差≤1.3%,结果令人满意。     

THE EXTRACTION OF GOLD FROM CYANIDE SOLUTION BY α—ALKYL SUBSTITUTED PYRIDINE RESIN

In this paper,we have studied the adsorption properties of gold by α-alkyl substituted pyridine resin( BPR) in alkaline solution.The single and dual component kinetic mass transfer process of Au(I),Ag(I) and other metal cyanide ions were also investigated.The results obtained show that the mass transfer rates of the cyanide ions in the resin phase are closely related to the molar ratio and the configuration of metal cyanide ions. The elution kinetics of Au(I) and other cyanide ions by NH4SCN has been investigated systematically.The intraparticle diffusion coefficient and activation energy of Au(I),Ag(I),Ni(I) Fe(Ⅲ） cyanide anions were determined in CI,NO3,OH-type BPR resin at different temperatures.It is found from the experimental results that the mechanism for extracting Au(I),Ag(I) and other metal cyanide anions by BPR resin belongs to ion exchange process.The difference of activation entropy of some metal cyanide anions(ΔS-ΔS^-) was evaluated.     

Density Functional Theory Study on the Adsorption of CN on Transition Metal M（100） （M = Ni,Pd, Pt,Cu, Ag and Au） Surfaces

The adsorption of cyanide on the top site of a series of transition metal M（100） （M = Cu, Ag, Au, Ni, Pd, Pt） surfaces via carbon and nitrogen atoms respectively, with the CN axis perpendicular to the surface, has been studied by means of density functional theory and cluster model. Geometry, adsorption energy and vibrational frequencies have been determined, and the present calculations show that the adsorption of CN through C-end on metal surface is more favorable than that via N-end for the same surface. The vibrational frequencies of CN for C-down configuration on surface are blue-shifted with respect to the free CN, which is contrary to the change of vibrational frequencies when CN is adsorbed by N-down structure. Furthermore, the charge transfer from surface to CN causes the increase of surface work function.