Zheng H, Gao J, Yu Z
Faculty of Applied Science and Technology, Chongqing University (B section), 400045 Chongqing.
Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Aug;20(4):581-4.
A new sensitive method for determining trace cadmium in polyferric sulphate flocculent is proposed in the paper. The new sensitive method is spectrophotometric method. The color reagents are the butylrhodamin B and potassium iodide. The surfactant is the polyvingl alcohol(PVA). The maximum absorbency wavelength is 607 nm. The molar absorptivity is 4.99 x 10(5) L.mol-1.cm-1. The sandell sensitivity is 2.25 x 10(-4) micrograms Cd2+.cm-2. The Beer's law is obeyed for Cd(II) in the range of 0-1.5 micrograms.25 mL-1. The recovery is 96%-105% and the sample processing procedure is simple. This method has been applied to determination of trace Cd(II) in polyferric sulphate flocculent. The determining results are satisfactory.
本文提出了一种测定聚硫酸铁絮凝剂中痕量镉的新的灵敏方法。该新的灵敏方法为分光光度法。显色剂为丁基罗丹明B和碘化钾。表面活性剂为聚乙烯醇（PVA）。最大吸收波长为607nm。摩尔吸光率为4.99×10⁵L·mol⁻¹·cm⁻¹。桑德尔灵敏度为2.25×10⁻⁴μg Cd²⁺·cm⁻²。Cd（Ⅱ）在0～1.5μg·25mL⁻¹范围内符合比尔定律。回收率为96%～105%，且样品处理程序简单。该方法已应用于聚硫酸铁絮凝剂中痕量Cd（Ⅱ）的测定，测定结果令人满意。
