[Determination of trace calcium in pearl eye drops by coprecipitation atomic absorption spectrophotometry].
The trace calcium in pearl eye drops was analyzed by atomic absorption spectrophotometry after the SrNO3-K2 CO3 co-precipitation. The absorbance at 422. 7 nm is linear with the calcium concentration in the range of 0. 0-20. 0 microg x mL(-1). The detection limit is 0. 06 microg x mL(-1) Ca. A new atomic absorption spectrophotometric method was proposed for the determination of calcium in pearl eye drops, with some advantages including high sensitivity, simplicity, rapidity and accuracy. The recovery is in the range of 97. 0%-98. 3%(n=5). The RSD is 0. 4%. It proved a good method for the determination of calcium in pearl eye drops.
Liang
Ai-hui
AH
Department of Materials and Chemical Engineering, Guilin University of Technology, Guilin 541004, China. ahliang@glite.edu.cn
Jiang
Zhi-liang
ZL
Wang
Xiu-li
XL