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Citation: LI Jing, ZHANG Hua, LI Quan-Min, DU Xin-Zhen. Indirect Determination of Cefradine by Extraction Flotation CuSCN in Potassium Nitrate-Ammonium Thiocyanate-Water System[J]. Chinese Journal of Applied Chemistry, ;2008, 25(9): 1095-1100. shu

Indirect Determination of Cefradine by Extraction Flotation CuSCN in Potassium Nitrate-Ammonium Thiocyanate-Water System

LI Jing ^a ,
ZHANG Hua ^a,b ,
LI Quan-Min ^a,, ,
DU Xin-Zhen ^b

1.
a College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007;
2.
b Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou

Corresponding author: LI Quan-Min,
Received Date: 10 November 2007
Available Online: 28 January 2008

A novel method for indirect determination of cefradine by extraction flotation of CuCSN with potassium nitrate-ammonium thiocyanate-water system was developed.At pH 4.0 to 6.0,in the existence of SCN^-,the thiol group(-SH) of the degradation product of cefradine could reduce Cu(Ⅱ) to Cu(Ⅰ),and the resulting Cu(Ⅰ) could react with SCN^- to form white emulsion precipitate CuSCN.In the presence of KNO₃,this precipitate ascended and floated on the surface of water.The amount of cefradine can be determined by measuring the flotation yield of Cu(Ⅱ).When the amount of added Cu(Ⅱ) is 50 μg,the linear range is maintained in the range 0.3~12.0 mg/L with a correlation coefficient of 0.999 2.The detection limit is 0.25 mg/L.This proposed method was successfully applied to the determination of cefradine in capsules and the recovery of cefradine in urine and human plasma with satisfactory results.
- cefradine,
- potassium nitrate,
- ammonium thiocyanate,
- copper(Ⅱ),
- extraction and flotation
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