微乳液增敏双波长分光光度法同时测定铜和铬  

Dual-wavelength spectrophotometric simultaneous determination of copper and chromium with sensitizing of microemulsion

作　　者：高俊杰[1] 余萍[1] 张东[1] 

机构地区：[1]沈阳工业学院化工分院,辽宁沈阳110045

出　　处：《冶金分析》2004年第4期13-15,共3页Metallurgical Analysis

摘　　要：研究了在CTMAB、正丁醇、正庚烷组成的微乳液存在下 ,水杨基荧光酮与铜 、铬 络合物的吸收光谱。结果表明 ,在磷酸二氢钾 -磷酸氢二钾缓冲液 (pH 6 4)和微乳液介质中 ,显色体系灵敏度都有很大提高 ,选择适宜的参比波长和测定波长 ,利用标准加入法可同时测定铜和铬。通过实际样品的测定 。In the presence of microemulsion of CTMAB-n-butanol-n-heptane-water, the absorption spectra for the complex both of copper*' and chromium*& with salicyl fluorone was studied.The amounts of copper and chromium can be found simultaneously by standard-addition method at the appropriate reference wavelength and determination wavelength.The apparent molar absorptivity is ε_(562)=1.408×10~5 L·mol^(-1)·cm^(-1) for (Cu*' ) and ε_(576)=1.66×10~5 L·mol^(-1)·cm^(-1) for Cr*& in the medium of KH_2PO_4-K_2HPO_4 buffer solution (pH 6.4) and microemulsion.Compared with that in CTMAB medium,the sensitivities of the color reactions for copper and chromium in the microemulsion medium are increased by 16% and 28% respectively.The proposed method has been successfully applied to the determination of copper and chromium in alloy steel.

关 键 词：双波长分光光度法 同时测定 水杨基荧光酮 增敏 缓冲液 适宜 标准加入法 微乳液 吸收光谱 CTMAB 

分 类 号：O657.32[理学—分析化学]