摘要
本文在 pH=5.6.Tween 80和SDS 存在下 Ni(Ⅱ)与5-BR-PADAP 显色反应形成紫红色络合物,其最大吸收波长在558nm.ε_(558)=1.1 6×10~5,Ni(Ⅱ)含量。0—0.3μg/ml 遵守比耳定律.常见的金属离子干扰用巯基棉分离.用于水库水痕量镍的测定,结果满意.
For the determination of trace nickel,the authors present a method of micellar solubilization spectrophotometry.The method is hased on the forma- tion of a red-violet complex by way of colour reaction of Ni(Ⅱ)with 2-(5-Br- Pyridylazo)-5-diethylaminophenol,or 5-Br-PADAP for slort,at pH 5.6 in the presence of a polysorbate and sodium dodecyl sulfonate.The complex gives its maximum absorbance at 558 nm as well as the molar absorptivity of 1.6×10~5. Beer′s law is obeyed by Ni(Ⅱ)of 0-0.36ug/ml.The interference of general metal ions can be eliminated by separation with sulfhydryl cotton.The method has been applied to determine trace Nickel in reservoir water with success.
出处
《华侨大学学报（自然科学版）》
CAS
1991年第2期168-171,共4页
Journal of Huaqiao University(Natural Science)
关键词
镍
测定
巯基棉
富集
分光光度法
sulfhydryl cotton
concentration
isolation
Nickel
spectrophtometry
