排序方式: 共有4条查询结果,搜索用时 3 毫秒
1
1.
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 … 总被引:2,自引:0,他引:2
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。 相似文献
2.
3.
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。 相似文献
4.
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. 相似文献
1