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Citation: XU Dong-Po, LIU Shao-Pu, LIU Zhong-Fang, HU Xiao-Li. Determination of Diphenhydramine Hydrochloride with 12-Tungstophosphoric Acid by Resonance Rayleigh Scattering Method[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1083-1085. shu

Determination of Diphenhydramine Hydrochloride with 12-Tungstophosphoric Acid by Resonance Rayleigh Scattering Method

1.
School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715

Corresponding author: HU Xiao-Li,
Received Date: 9 October 2006
Available Online: 8 February 2007
Fund Project: 国家自然科学基金(20475045) (20475045)

12-Tungstophosphoric acid reacted with diphenhydramine hydrochloride(DP·HCl) in an acidic medium pH 0~1.5 to form complexes, which resulted in great enhancement of resonance Rayleigh scattering(RRS). The maximum RRS peak is at 305 nm, and the RRS intensity is proportional to the concentration of DP·HCl in the range of 8.0×10^-9~1.6×10^-6 g/mL. Therefore, a RRS method of determining DP·HCl was developed. This method has high sensitivity and good selectivity, and the detection limit(3σ) is 0.8×10^-9 g/mL. The method was applied to determine the content of DP·HCl in urine samples, the recovery was between 96.0% and 104.2%. The reaction mechanism was discussed by means of AM1 of quantum chemistry.
- resonance Reyleigh scattering,
- tungstophosphoric acid,
- diphenhydramine hydrochloride
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