浊点萃取分离-光度法测定水中痕量钼  

Photometric Determination of Trace Amount of Molybdenum(Ⅵ) in Water with Separation by Cloud Point Extraction

作　　者：车音[1,2] 陈松庆[1] 朱霞石[1] 

机构地区：[1]扬州大学化学化工学院,扬州225002 [2]扬州环境资源职业技术学院,扬州225127

出　　处：《理化检验（化学分册）》2010年第6期618-620,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学基金资助项目(20875082)

摘　　要：水样中痕量钼(Ⅵ)在4.0×10-3mol.L-1盐酸溶液中,并在10 mL总体积中0.1 gTriton X-114存在的条件下,与1.0 mL的1.0×10-3mol.L-1苯基荧光酮(PF)溶液反应,并在75℃水浴中加热25 min后离心2 min实施浊点萃取分离。除去上层水相后,于下层胶束相中加入0.02 mol.L-1盐酸溶液0.4 mL,定容为2.0 mL,在其吸收峰523 nm波长处,以试剂空白作参比测定其中钼(Ⅵ)-PF络合物的吸光度。方法的线性范围在20～140μg.L-1之间,其检出限(3S/N)为12μg.L-1。Traces of molybdenum（Ⅵ） in water was reacted with 1.0 mL of 1.0×10-3mol·L-1 phenylfluorone（PF） solution in 4.0×10-3mol·L-1 HCl solution in the presence of 0.1 g of Triton X-114 per 10 mL of reaction solution.Cloud point extraction was applied to the reaction mixture by heating for 25 min at 75 ℃ in water bath,and centrifuging for 2 min to separate the phases.The upper aqueous phase was removed,and the absorbance of the Mo（Ⅵ）-PF complex in the lower micellar phase（after adding 0.4 mL of 0.02 mol·L-1 HCl and diluting quantitatively to 2.0 mL） was measured at the wavelength of its absorption maxium（523 nm） with reference to reagent blank.Range of linearity was kept between 20 and 140 μg·L-1 of Mo（Ⅵ）,with detection limit（3S/N） of 12 μg·L-1.

关 键 词：光度法 浊点萃取 钼(Ⅵ) 苯基荧光酮 

分 类 号：O657.32[理学—分析化学]