萃淋树脂分离-分光光度法测定工业废水中微量Cr(Ⅲ)、Cr(Ⅵ)和总Cr  

SPECTROPHOTOMETRIC DETERMINATION OF TRACE Cr(Ⅲ), Cr(Ⅵ) AND ∑Cr IN INDUSTRIAL WASTE WATER SEPARATED BY CL -TBP LEVEXTREL RESIN

作　　者：游建南[1] 

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《铀矿冶》2001年第3期198-204,共7页Uranium Mining and Metallurgy

摘　　要：报道了用 CL- TBP萃淋树脂分离 ,分光光度法测定工业废水中微量 Cr( )、Cr( )和∑ Cr的方法。在 0 .1mol/ L盐酸介质中 ,用 CL- TBP萃淋树脂分离 Cr( )和 Cr( ) ,吸附在萃淋树脂中的 Cr( ) ,可用水解吸。然后 ,在 0 .5mol/ L硫酸和磷酸介质中 ,以 DPC分光光度法测定Cr( )。在 p H为 4 .5的缓冲溶液中 ,Cr( )与 5- Br- PADAP- Zeph形成三元配合物并可用光度法测定。在加热条件下 ,用高锰酸钾氧化低价铬 ,直接以 DPC光度法测定其总铬。本法的精密度优于± 5% ,标准加入回收分别为 98%～ 10 4 %。A method for spectrophotometric determination of trace Cr(Ⅲ),Cr(Ⅵ) and ∑Cr in industrial waste water has been developed.In 0.1 mol/L HCI medium,the Cr(Ⅲ) and Cr(Ⅵ) are separated by CL TBP levextrel resin.The Cr(Ⅵ) absorbed on the resin is eluted by water. The trace Cr(Ⅵ) is determined with DPC spectrophotometry in 0.5 mol/L H 2SO 4 and H 3PO 4 mediums.In the buffer medium of pH5.5,the Cr(Ⅲ) and 5 Br PADAP Zeph form ternary complex,which is detemined with spectrophotometry.At heated condition,the trivalent chromium is oxidized by potassium permanganate and total chromium is determined by direct photometric method.The precision is better than±5%,and the recovery of Cr is 98%~104%.

关 键 词：萃淋树脂 工业废水 分光光度 铬 色层柱 显色反应 

分 类 号：X132[环境科学与工程—环境科学]