新显色剂5—（4—苯乙酮基偶氮）—8—羟基喹啉与锌显色反应的研究 …

研究了新显色剂５－（４－苯乙酮基偶氮）－８－羟基喹啉（ｐ－ＡＡＨＱ）与Ｚｎ（Ⅱ）的显色反应条件,在阳离子表面活性剂ＣＴＭＡＢ存在下,ＰＨ４．０－５．５缓冲介质中,形成稳定的１：２红色配合物,最大吸收波长为５２０ｎｍ,ε＝１．０１×１０＾５,含Ｚｎ（Ⅱ））量在０－２０μｇ／２５ｍｌ范围内符合比耳定律。采用氟化钾－磷酸盐混合掩蔽剂,方法用于人发、面食和黄连不微量锌的测定。     

D302-Ⅱ-3阴离子交换树脂吸附铼的性能研究及应用

本文用静态法研究了D302-Ⅱ-3弱碱性阴离子交换树脂吸附铼的酸度、吸附速率、吸附反应热焓及吸附容量等性能,并用动态法考察了吸附酸碱度、吸附流速和饱和吸附容量等对吸附的影响,用于废渣中铼的提取,铼的回收率达83%以上,获得较为满意的结果。     

新最色剂5-(4-苯乙酮基偶氮)-8-羟基喹啉与锌显色反应的研究及应用

研究了新显色剂5-(4-苯乙酮基偶氮)-8-羟基喹啉(P-AAHQ)与Zn(Ⅱ)的显色反应条件,在阳离子表面活性剂CTMAB存在下,pH 4.0～5.5缓冲介质中,形成稳定的1:2红色配合物,最大吸收波长为520nm,ε=1.01×10~5,含Zn(Ⅱ)量在0～20μg/25ml范围内符合比耳定律。采用氟化钾—磷酸盐混合掩蔽剂,方法用于人发、面食和黄连中微量锌的测定。     

Synthesis and electrical characterization of tungsten oxide nanowires

Tungsten oxide nanowires of diameters ranging from 7 to 200~nm are prepared on a tungsten rod substrate by using the chemical vapour deposition (CVD) method with vapour--solid (VS) mechanism. Tin powders are used to control oxygen concentration in the furnace, thereby assisting the growth of the tungsten oxide nanowires. The grown tungsten oxide nanowires are determined to be of crystalline W₁₈O₄₉. I--V curves are measured by an \textit{in situ} transmission electron microscope (TEM) to investigate the electrical properties of the nanowires. All of the I--V curves observed are symmetric, which reveals that the tungsten oxide nanowires are semiconducting. Quantitative analyses of the experimental I--V curves by using a metal--semiconductor--metal (MSM) model give some intrinsic parameters of the tungsten oxide nanowires, such as the carrier concentration, the carrier mobility and the conductivity.