Spectrophotometric determination of trace zinc in municipal sludge sample with rhodamine B
KONG Qiong-yu1, XIA Chang-bin*2
1.Changsha County Environmental Protection Monitoring Stations，Changsha 410016, China; 2.School of Chemcial & Biological Engineering， Changsha University of Science and Technology， Changsha 410114， China
Abstract： In presence of KSCN and polyethylene glycol-2000, the trace zinc in municipal sludge was determined based on the coloring reaction between Zn and rhodamine B (RhB). The results showed that, the coloring reaction between Zn and RhB was highly sensitive in the medium of 0.84 mol/L HCl. The formed complex Zn2+-SCN-RhB had maximum absorption wavelength at 600 nm. The apparent molar absorptivity was 1.6×106 L·mol-1·cm-1. Beer's law was obeyed for the content of Zn in range of 0-0.060 mg/L. The detection limit of method was 0.04 μg/L. The proposed method was applied to the determination of trace zinc in municipal sludge, and the results were consistent with those obtained by dithizone photometry. The relative standard deviation (RSD, n=6) was 0.3 %.
孔琼宇，夏畅斌. 罗丹明B分光光度法测定城市污泥中痕量锌[J]. 冶金分析, 2012, 32(12): 57-59.
KONG Qiong-yu, XIA Chang-bin. Spectrophotometric determination of trace zinc in municipal sludge sample with rhodamine B. , 2012, 32(12): 57-59.
